Superior Weather Records (USW00024159)

Record envelope, standing records and threshold days for Superior (USW00024159), Montana, United States, with 105 years of record.

Key Facts for Superior

Superior (USW00024159) is a weather station in Montana, United States at 47.19 latitude and -114.89 longitude, 826 m (2,710 ft) above sea level.
The station reports from 1914 to 2018, 105 years of record.
1,464 records set at Superior still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Superior set a monthly record high maximum temperature of 41.7 C (107.1 F) on 11 August 2018.

About the Station

Location: Montana, United States, 47.19 latitude, -114.89 longitude.
Elevation: 826 m (2,710 ft).
Period of record: 1914 to 2018, 105 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.

Daily Record Envelope and 2026

0 days at or beyond a record

The band shows the record high and record low for each calendar day at Superior. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Superior, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	15.6 C (60.1 F)	-37.8 C (-36.0 F)	n/a	n/a
Feb	20.6 C (69.1 F)	-36.1 C (-33.0 F)	n/a	n/a
Mar	26.7 C (80.1 F)	-22.8 C (-9.0 F)	n/a	n/a
Apr	32.2 C (90.0 F)	-16.7 C (1.9 F)	n/a	n/a
May	37.2 C (99.0 F)	-8.3 C (17.1 F)	n/a	n/a
Jun	38.9 C (102.0 F)	-6.7 C (19.9 F)	n/a	n/a
Jul	42.2 C (108.0 F)	-1.1 C (30.0 F)	n/a	n/a
Aug	41.7 C (107.1 F)	-4.4 C (24.1 F)	n/a	n/a
Sep	39.4 C (102.9 F)	-10.6 C (12.9 F)	n/a	n/a
Oct	32.2 C (90.0 F)	-19.4 C (-2.9 F)	n/a	n/a
Nov	23.3 C (73.9 F)	-26.1 C (-15.0 F)	n/a	n/a
Dec	16.1 C (61.0 F)	-33.3 C (-27.9 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Superior still stand. 1919 holds the most, with 43.

Standing records at Superior by the year they were set
Year set	Standing records
1914	19
1915	14
1916	37
1917	34
1918	32
1919	43
1920	20
1921	19
1923	2
1924	33
1925	13
1926	13
1927	12
1928	10
1929	20
1930	27
1931	22
1932	14
1933	26
1934	25
1935	34
1936	36
1937	21
1938	6
1939	20
1940	8
1941	8
1942	15
1943	15
1944	10
1945	12
1946	9
1947	8
1948	12
1949	18
1950	28
1951	15
1952	6
1953	16
1954	11
1955	20
1956	8
1957	15
1958	6
1959	10
1960	25
1961	17
1962	13
1963	15
1964	8
1965	17
1966	11
1967	12
1968	14
1969	10
1970	9
1971	11
1972	21
1973	8
1974	5
1975	8
1976	11
1977	16
1978	6
1979	14
1980	4
1981	8
1982	5
1983	16
1984	14
1985	18
1986	18
1987	11
1988	8
1989	19
1990	12
1991	7
1992	10
1993	12
1994	11
1995	17
1996	9
1997	6
1998	18
1999	14
2000	8
2001	7
2002	17
2003	16
2004	12
2005	2
2006	12
2007	10
2008	9
2009	9
2010	7
2011	10
2012	8
2013	14
2014	7
2015	15
2016	8
2018	3

All-Time Record Progression

8 new records

8 all-time records were set at Superior between 22 August 1947 and 18 December 2015. Each dot is a new record.

When Superior set new all-time records
Date	Kind	Detail
1947-08-22	Record daily precipitation	Record daily precipitation 42.9 mm (1.7 in)
1950-01-19	Record snow depth	Record snow depth 78.7 cm (31.0 in)
1953-01-26	Record daily precipitation	Record daily precipitation 51.8 mm (2.0 in)
1996-12-27	Record snow depth	Record snow depth 101.6 cm (40.0 in)
1996-12-29	Record snow depth	Record snow depth 111.8 cm (44.0 in)
2012-01-19	Record daily snowfall	Record daily snowfall 39.4 cm (15.5 in)
2015-07-11	Record daily precipitation	Record daily precipitation 55.9 mm (2.2 in)
2015-12-18	Record daily precipitation	Record daily precipitation 58.4 mm (2.3 in)

Wettest Day of Each Month

Dec: 58.4 mm (2.3 in)

The wettest day on record for each calendar month at Superior. The most was 58.4 mm (2.3 in) on 18 December 2015.

Record daily precipitation for each month at Superior
Month	Record daily precipitation (mm)	Date
Jan	51.8 mm (2.0 in)	26 January 1953
Feb	29.7 mm (1.2 in)	10 February 1949
Mar	25.4 mm (1.0 in)	1 March 2001
Apr	30.5 mm (1.2 in)	6 April 2006
May	46.7 mm (1.8 in)	20 May 1957
Jun	44.2 mm (1.7 in)	17 June 2005
Jul	55.9 mm (2.2 in)	11 July 2015
Aug	42.9 mm (1.7 in)	22 August 1947
Sep	29.7 mm (1.2 in)	16 September 1947
Oct	38.4 mm (1.5 in)	27 October 1994
Nov	37.8 mm (1.5 in)	1 November 2015
Dec	58.4 mm (2.3 in)	18 December 2015

Period of Record Coverage

1914 to 2018

104 years of record at Superior, 1914 to 2018. 21 years have data for under 90 percent of days and are left out of rankings: 1914, 1915, 1916, 1917, 1918, 1919, 1920, 1921 and others.

Days with data per year at Superior
Year	Days with data	Share of year	Complete
1914	264	72%	No
1915	296	81%	No
1916	318	87%	No
1917	327	90%	No
1918	275	75%	No
1919	301	82%	No
1920	305	83%	No
1921	200	55%	No
1923	275	75%	No
1924	364	99%	Yes
1925	350	96%	Yes
1926	364	100%	Yes
1927	362	99%	Yes
1928	350	96%	Yes
1929	318	87%	No
1930	359	98%	Yes
1931	364	100%	Yes
1932	365	100%	Yes
1933	355	97%	Yes
1934	358	98%	Yes
1935	364	100%	Yes
1936	365	100%	Yes
1937	363	99%	Yes
1938	364	100%	Yes
1939	365	100%	Yes
1940	366	100%	Yes
1941	365	100%	Yes
1942	365	100%	Yes
1943	364	100%	Yes
1944	366	100%	Yes
1945	351	96%	Yes
1946	365	100%	Yes
1947	365	100%	Yes
1948	365	100%	Yes
1949	365	100%	Yes
1950	365	100%	Yes
1951	365	100%	Yes
1952	365	100%	Yes
1953	365	100%	Yes
1954	343	94%	Yes
1955	304	83%	No
1956	352	96%	Yes
1957	348	95%	Yes
1958	343	94%	Yes
1959	365	100%	Yes
1960	363	99%	Yes
1961	363	99%	Yes
1962	365	100%	Yes
1963	365	100%	Yes
1964	364	99%	Yes
1965	362	99%	Yes
1966	365	100%	Yes
1967	365	100%	Yes
1968	366	100%	Yes
1969	365	100%	Yes
1970	364	100%	Yes
1971	363	99%	Yes
1972	365	100%	Yes
1973	364	100%	Yes
1974	364	100%	Yes
1975	365	100%	Yes
1976	366	100%	Yes
1977	365	100%	Yes
1978	347	95%	Yes
1979	352	96%	Yes
1980	328	90%	No
1981	348	95%	Yes
1982	352	96%	Yes
1983	343	94%	Yes
1984	359	98%	Yes
1985	342	94%	Yes
1986	336	92%	Yes
1987	355	97%	Yes
1988	357	98%	Yes
1989	302	83%	No
1990	363	99%	Yes
1991	342	94%	Yes
1992	321	88%	No
1993	333	91%	Yes
1994	344	94%	Yes
1995	351	96%	Yes
1996	339	93%	Yes
1997	349	96%	Yes
1998	347	95%	Yes
1999	312	85%	No
2000	349	95%	Yes
2001	353	97%	Yes
2002	344	94%	Yes
2003	355	97%	Yes
2004	333	91%	Yes
2005	358	98%	Yes
2006	360	99%	Yes
2007	358	98%	Yes
2008	358	98%	Yes
2009	362	99%	Yes
2010	360	99%	Yes
2011	348	95%	Yes
2012	352	96%	Yes
2013	327	90%	No
2014	313	86%	No
2015	246	67%	No
2016	188	51%	No
2017	13	4%	No
2018	146	40%	No

Latest Records

Latest records at Superior
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
11 August 2018	Superior, US	monthly high max	41.7 C (107.1 F)	0.6 C (1.1 F)	57 years	38 of 100 (Notable)
10 August 2018	Superior, US	daily high max	40.6 C (105.1 F)	0.6 C (1.1 F)	83 years	35 of 100 (Notable)
18 May 2018	Superior, US	daily high min	10.0 C (50.0 F)	0.6 C (1.1 F)	27 years	19 of 100 (Routine)
17 May 2018	Superior, US	daily rain	10.2 mm (0.4 in)	2.8 mm (0.11 in)	56 years	20 of 100 (Routine)
25 December 2016	Superior, US	daily rain	18.3 mm (0.7 in)	7.6 mm (0.30 in)	93 years	20 of 100 (Routine)
14 November 2016	Superior, US	daily high min (Tie)	5.6 C (42.1 F)	tie	49 years	6 of 100 (Routine)
13 July 2016	Superior, US	daily low max	20.6 C (69.1 F)	0.5 C (0.9 F)	36 years	21 of 100 (Routine)
9 July 2016	Superior, US	daily rain	15.2 mm (0.6 in)	7.8 mm (0.31 in)	99 years	20 of 100 (Routine)
9 June 2016	Superior, US	daily high max	36.1 C (97.0 F)	0.5 C (0.9 F)	1 year	10 of 100 (Routine)
19 May 2016	Superior, US	daily rain	18.3 mm (0.7 in)	1.0 mm (0.04 in)	59 years	20 of 100 (Routine)
6 May 2016	Superior, US	daily high min	11.7 C (53.1 F)	2.3 C (4.1 F)	82 years	40 of 100 (Notable)
5 May 2016	Superior, US	daily high min	10.6 C (51.1 F)	1.2 C (2.2 F)	45 years	26 of 100 (Routine)
22 April 2016	Superior, US	daily high max (Tie)	29.4 C (84.9 F)	tie	47 years	6 of 100 (Routine)
21 April 2016	Superior, US	daily high max	29.4 C (84.9 F)	0.5 C (0.9 F)	82 years	34 of 100 (Routine)
11 April 2016	Superior, US	daily high max (Tie)	25.6 C (78.1 F)	tie	31 years	4 of 100 (Routine)
9 April 2016	Superior, US	daily high max (Tie)	28.3 C (82.9 F)	tie	20 years	4 of 100 (Routine)
10 March 2016	Superior, US	daily high min	4.4 C (39.9 F)	1.1 C (2.0 F)	43 years	24 of 100 (Routine)
15 February 2016	Superior, US	daily high min	3.3 C (37.9 F)	1.1 C (2.0 F)	34 years	21 of 100 (Routine)
9 February 2016	Superior, US	daily high max	12.2 C (54.0 F)	1.1 C (2.0 F)	24 years	19 of 100 (Routine)
19 December 2015	Superior, US	daily rain	50.8 mm (2.0 in)	22.4 mm (0.9 in)	97 years	79 of 100 (Major)

Climate Trend

78 complete years, 1924 to 2014

One stripe for each of 78 complete years at Superior, 1924 to 2014. Blue stripes are years cooler than the station's own mean of 8.1 C (46.5 F); red stripes are warmer. The coolest year was 1949, at 6.0 C (42.7 F), and the warmest was 1934, at 10.1 C (50.2 F). The strongest colour marks a difference of 2.2 C (4.0 F).

Annual mean temperature at Superior as warming stripes, 1924 to 2014
Year	Annual mean temperature	Difference from the station mean
1924	6.6 C	-1.45 C
1927	7.0 C	-1.10 C
1928	7.1 C	-1.01 C
1930	6.9 C	-1.20 C
1931	8.0 C	-0.13 C
1932	7.4 C	-0.73 C
1933	8.0 C	-0.12 C
1934	10.1 C	+2.02 C
1935	8.2 C	+0.12 C
1936	7.8 C	-0.27 C
1937	7.2 C	-0.89 C
1938	8.1 C	-0.01 C
1939	9.1 C	+1.01 C
1940	9.1 C	+0.99 C
1941	8.6 C	+0.51 C
1942	7.4 C	-0.70 C
1943	7.3 C	-0.79 C
1944	7.6 C	-0.52 C
1946	7.4 C	-0.73 C
1947	7.6 C	-0.45 C
1948	6.2 C	-1.91 C
1949	6.0 C	-2.13 C
1950	6.0 C	-2.04 C
1951	6.0 C	-2.09 C
1952	6.7 C	-1.36 C
1953	8.2 C	+0.13 C
1954	7.6 C	-0.53 C
1956	7.7 C	-0.40 C
1957	7.7 C	-0.42 C
1959	7.7 C	-0.41 C
1960	7.9 C	-0.15 C
1961	8.8 C	+0.76 C
1962	8.2 C	+0.14 C
1963	8.7 C	+0.60 C
1964	7.6 C	-0.48 C
1965	8.4 C	+0.33 C
1966	8.9 C	+0.84 C
1967	8.9 C	+0.83 C
1968	8.0 C	-0.04 C
1969	7.8 C	-0.30 C
1970	8.0 C	-0.08 C
1971	7.9 C	-0.23 C
1972	7.8 C	-0.28 C
1973	8.6 C	+0.47 C
1974	8.7 C	+0.59 C
1975	7.4 C	-0.71 C
1976	8.3 C	+0.25 C
1977	8.1 C	+0.05 C
1978	7.7 C	-0.40 C
1981	8.7 C	+0.58 C
1982	7.5 C	-0.57 C
1983	8.1 C	+0.05 C
1984	7.9 C	-0.21 C
1985	6.9 C	-1.17 C
1987	8.2 C	+0.07 C
1988	8.8 C	+0.72 C
1990	8.6 C	+0.50 C
1991	8.4 C	+0.33 C
1992	9.2 C	+1.10 C
1993	7.3 C	-0.83 C
1994	9.5 C	+1.37 C
1995	9.0 C	+0.95 C
1997	8.2 C	+0.08 C
1998	9.2 C	+1.08 C
2000	8.4 C	+0.31 C
2001	9.3 C	+1.19 C
2002	8.5 C	+0.44 C
2003	9.2 C	+1.14 C
2005	8.4 C	+0.36 C
2006	9.3 C	+1.17 C
2007	9.3 C	+1.24 C
2008	7.8 C	-0.25 C
2009	8.6 C	+0.56 C
2010	8.9 C	+0.77 C
2011	8.5 C	+0.38 C
2012	9.5 C	+1.43 C
2013	8.7 C	+0.64 C
2014	8.7 C	+0.64 C

The annual mean temperature here has risen by 0.2 C (0.1 to 0.2) per decade over 1924 to 2014. In Fahrenheit: 0.3 F (0.2 to 0.4) per decade. The slope is a straight line fitted to 78 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Superior
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.2 C (0.1 to 0.2) per decade	0.3 F (0.2 to 0.4) per decade	1924 to 2014	78	Rise
Mean daily maximum	0.06 C (-0.03 to 0.15) per decade	0.1 F (-0.1 to 0.3) per decade	1924 to 2014	78	Not clearly different from zero
Mean daily minimum	0.3 C (0.2 to 0.3) per decade	0.5 F (0.4 to 0.6) per decade	1924 to 2014	78	Rise

A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.

Extremes by Year

1914 to 2018

Yearly extremes at Superior: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	42.2 C (108.0 F)	1935	37.8 C (100.0 F)	104
Coldest night (TNn)	-37.8 C (-36.0 F)	1937	-24.7 C (-12.5 F)	104
Wettest day (Rx1day)	58.4 mm (2.3 in)	2015	25.4 mm (1.0 in)	104
Wettest five days (Rx5day)	118.9 mm (4.7 in)	2015	43.0 mm (1.7 in)	103
Longest dry spell (CDD)	108 days	1931	28 days	104

Hottest day (TXx)

The hottest day of the year at Superior, 1914 to 2018. The record is 42.2 C (108.0 F) in 1935, marked on the chart; the median year is 37.8 C (100.0 F).

Hottest day (TXx) at Superior by year
Year	Hottest day (TXx)
1914	40.0 C (104.0 F)
1915	40.6 C (105.1 F)
1916	36.1 C (97.0 F)
1917	36.7 C (98.1 F)
1918	36.1 C (97.0 F)
1919	39.4 C (102.9 F)
1920	34.4 C (93.9 F)
1921	36.1 C (97.0 F)
1923	36.7 C (98.1 F)
1924	38.3 C (100.9 F)
1925	37.8 C (100.0 F)
1926	37.8 C (100.0 F)
1927	36.7 C (98.1 F)
1928	38.3 C (100.9 F)
1929	40.0 C (104.0 F)
1930	39.4 C (102.9 F)
1931	39.4 C (102.9 F)
1932	38.3 C (100.9 F)
1933	39.4 C (102.9 F)
1934	40.6 C (105.1 F)
1935	42.2 C (108.0 F)
1936	40.0 C (104.0 F)
1937	37.8 C (100.0 F)
1938	37.8 C (100.0 F)
1939	40.0 C (104.0 F)
1940	40.0 C (104.0 F)
1941	38.9 C (102.0 F)
1942	37.8 C (100.0 F)
1943	36.1 C (97.0 F)
1944	36.1 C (97.0 F)
1945	36.7 C (98.1 F)
1946	37.2 C (99.0 F)
1947	37.2 C (99.0 F)
1948	34.4 C (93.9 F)
1949	37.8 C (100.0 F)
1950	39.4 C (102.9 F)
1951	37.8 C (100.0 F)
1952	38.3 C (100.9 F)
1953	40.6 C (105.1 F)
1954	37.2 C (99.0 F)
1955	38.9 C (102.0 F)
1956	36.1 C (97.0 F)
1957	36.1 C (97.0 F)
1958	36.7 C (98.1 F)
1959	38.9 C (102.0 F)
1960	40.0 C (104.0 F)
1961	41.1 C (106.0 F)
1962	37.8 C (100.0 F)
1963	37.2 C (99.0 F)
1964	37.8 C (100.0 F)
1965	36.7 C (98.1 F)
1966	36.1 C (97.0 F)
1967	37.2 C (99.0 F)
1968	35.0 C (95.0 F)
1969	40.6 C (105.1 F)
1970	36.7 C (98.1 F)
1971	37.8 C (100.0 F)
1972	36.7 C (98.1 F)
1973	38.9 C (102.0 F)
1974	37.2 C (99.0 F)
1975	38.3 C (100.9 F)
1976	35.6 C (96.1 F)
1977	36.7 C (98.1 F)
1978	36.7 C (98.1 F)
1979	38.3 C (100.9 F)
1980	35.6 C (96.1 F)
1981	36.7 C (98.1 F)
1982	33.9 C (93.0 F)
1983	36.7 C (98.1 F)
1984	37.8 C (100.0 F)
1985	37.8 C (100.0 F)
1986	38.9 C (102.0 F)
1987	35.6 C (96.1 F)
1988	36.7 C (98.1 F)
1989	36.7 C (98.1 F)
1990	37.2 C (99.0 F)
1991	36.7 C (98.1 F)
1992	37.8 C (100.0 F)
1993	35.0 C (95.0 F)
1994	38.3 C (100.9 F)
1995	36.1 C (97.0 F)
1996	37.8 C (100.0 F)
1997	37.8 C (100.0 F)
1998	39.4 C (102.9 F)
1999	38.3 C (100.9 F)
2000	38.9 C (102.0 F)
2001	38.3 C (100.9 F)
2002	41.1 C (106.0 F)
2003	38.9 C (102.0 F)
2004	37.8 C (100.0 F)
2005	37.8 C (100.0 F)
2006	38.9 C (102.0 F)
2007	40.0 C (104.0 F)
2008	38.3 C (100.9 F)
2009	36.7 C (98.1 F)
2010	36.7 C (98.1 F)
2011	36.1 C (97.0 F)
2012	37.8 C (100.0 F)
2013	38.9 C (102.0 F)
2014	37.2 C (99.0 F)
2015	38.3 C (100.9 F)
2016	36.1 C (97.0 F)
2017	8.9 C (48.0 F)
2018	41.7 C (107.1 F)

Coldest night (TNn)

The coldest night of the year at Superior, 1914 to 2018. The record is -37.8 C (-36.0 F) in 1937, marked on the chart; the median year is -24.7 C (-12.5 F).

Coldest night (TNn) at Superior by year
Year	Coldest night (TNn)
1914	-29.4 C (-20.9 F)
1915	-25.6 C (-14.1 F)
1916	-31.1 C (-24.0 F)
1917	-25.6 C (-14.1 F)
1918	-31.1 C (-24.0 F)
1919	-30.6 C (-23.1 F)
1920	-18.3 C (-0.9 F)
1921	-18.3 C (-0.9 F)
1923	-28.9 C (-20.0 F)
1924	-33.3 C (-27.9 F)
1925	-11.7 C (10.9 F)
1926	-21.1 C (-6.0 F)
1927	-32.8 C (-27.0 F)
1928	-22.8 C (-9.0 F)
1929	-34.4 C (-29.9 F)
1930	-34.4 C (-29.9 F)
1931	-22.8 C (-9.0 F)
1932	-26.7 C (-16.1 F)
1933	-36.1 C (-33.0 F)
1934	-13.3 C (8.1 F)
1935	-32.8 C (-27.0 F)
1936	-36.1 C (-33.0 F)
1937	-37.8 C (-36.0 F)
1938	-23.3 C (-9.9 F)
1939	-26.1 C (-15.0 F)
1940	-21.7 C (-7.1 F)
1941	-18.3 C (-0.9 F)
1942	-30.6 C (-23.1 F)
1943	-30.0 C (-22.0 F)
1944	-26.7 C (-16.1 F)
1945	-18.9 C (-2.0 F)
1946	-17.8 C (0.0 F)
1947	-19.4 C (-2.9 F)
1948	-27.2 C (-17.0 F)
1949	-33.3 C (-27.9 F)
1950	-35.0 C (-31.0 F)
1951	-27.8 C (-18.0 F)
1952	-26.1 C (-15.0 F)
1953	-10.6 C (12.9 F)
1954	-23.3 C (-9.9 F)
1955	-25.6 C (-14.1 F)
1956	-28.3 C (-18.9 F)
1957	-33.9 C (-29.0 F)
1958	-16.1 C (3.0 F)
1959	-26.1 C (-15.0 F)
1960	-26.1 C (-15.0 F)
1961	-25.6 C (-14.1 F)
1962	-28.3 C (-18.9 F)
1963	-29.4 C (-20.9 F)
1964	-30.0 C (-22.0 F)
1965	-20.0 C (-4.0 F)
1966	-17.8 C (0.0 F)
1967	-16.7 C (1.9 F)
1968	-31.1 C (-24.0 F)
1969	-22.2 C (-8.0 F)
1970	-21.1 C (-6.0 F)
1971	-18.3 C (-0.9 F)
1972	-27.8 C (-18.0 F)
1973	-25.6 C (-14.1 F)
1974	-25.6 C (-14.1 F)
1975	-21.1 C (-6.0 F)
1976	-18.9 C (-2.0 F)
1977	-20.6 C (-5.1 F)
1978	-30.6 C (-23.1 F)
1979	-33.3 C (-27.9 F)
1980	-27.2 C (-17.0 F)
1981	-22.2 C (-8.0 F)
1982	-28.3 C (-18.9 F)
1983	-29.4 C (-20.9 F)
1984	-22.8 C (-9.0 F)
1985	-25.6 C (-14.1 F)
1986	-17.8 C (0.0 F)
1987	-22.8 C (-9.0 F)
1988	-21.1 C (-6.0 F)
1989	-30.0 C (-22.0 F)
1990	-31.1 C (-24.0 F)
1991	-18.3 C (-0.9 F)
1992	-17.8 C (0.0 F)
1993	-27.2 C (-17.0 F)
1994	-26.1 C (-15.0 F)
1995	-18.9 C (-2.0 F)
1996	-28.9 C (-20.0 F)
1997	-22.2 C (-8.0 F)
1998	-25.0 C (-13.0 F)
1999	-15.6 C (3.9 F)
2000	-17.2 C (1.0 F)
2001	-13.9 C (7.0 F)
2002	-18.9 C (-2.0 F)
2003	-17.2 C (1.0 F)
2004	-28.3 C (-18.9 F)
2005	-23.3 C (-9.9 F)
2006	-22.2 C (-8.0 F)
2007	-18.9 C (-2.0 F)
2008	-24.4 C (-11.9 F)
2009	-22.8 C (-9.0 F)
2010	-22.2 C (-8.0 F)
2011	-21.7 C (-7.1 F)
2012	-11.1 C (12.0 F)
2013	-22.8 C (-9.0 F)
2014	-27.2 C (-17.0 F)
2015	-18.9 C (-2.0 F)
2016	-22.2 C (-8.0 F)
2017	-20.6 C (-5.1 F)
2018	-15.0 C (5.0 F)

Wettest day (Rx1day)

The wettest day of the year at Superior, 1914 to 2018. The record is 58.4 mm (2.3 in) in 2015, marked on the chart; the median year is 25.4 mm (1.0 in).

Wettest day (Rx1day) at Superior by year
Year	Wettest day (Rx1day)
1914	15.2 mm (0.6 in)
1915	25.9 mm (1.0 in)
1916	30.7 mm (1.2 in)
1917	31.8 mm (1.3 in)
1918	23.6 mm (0.9 in)
1919	25.4 mm (1.0 in)
1920	30.5 mm (1.2 in)
1921	17.8 mm (0.7 in)
1923	24.6 mm (1.0 in)
1924	24.6 mm (1.0 in)
1925	30.2 mm (1.2 in)
1926	25.4 mm (1.0 in)
1927	17.8 mm (0.7 in)
1928	19.8 mm (0.8 in)
1929	14.5 mm (0.6 in)
1930	29.7 mm (1.2 in)
1931	20.3 mm (0.8 in)
1932	25.4 mm (1.0 in)
1933	34.8 mm (1.4 in)
1934	15.2 mm (0.6 in)
1935	16.0 mm (0.6 in)
1936	17.0 mm (0.7 in)
1937	25.4 mm (1.0 in)
1938	19.6 mm (0.8 in)
1939	17.8 mm (0.7 in)
1940	17.8 mm (0.7 in)
1941	27.9 mm (1.1 in)
1942	32.0 mm (1.3 in)
1943	17.0 mm (0.7 in)
1944	25.4 mm (1.0 in)
1945	22.4 mm (0.9 in)
1946	27.2 mm (1.1 in)
1947	42.9 mm (1.7 in)
1948	25.4 mm (1.0 in)
1949	29.7 mm (1.2 in)
1950	25.9 mm (1.0 in)
1951	23.9 mm (0.9 in)
1952	37.6 mm (1.5 in)
1953	51.8 mm (2.0 in)
1954	22.9 mm (0.9 in)
1955	29.7 mm (1.2 in)
1956	26.7 mm (1.1 in)
1957	46.7 mm (1.8 in)
1958	33.3 mm (1.3 in)
1959	31.0 mm (1.2 in)
1960	22.1 mm (0.9 in)
1961	21.1 mm (0.8 in)
1962	23.4 mm (0.9 in)
1963	21.1 mm (0.8 in)
1964	39.6 mm (1.6 in)
1965	38.6 mm (1.5 in)
1966	32.8 mm (1.3 in)
1967	13.7 mm (0.5 in)
1968	18.0 mm (0.7 in)
1969	30.7 mm (1.2 in)
1970	20.1 mm (0.8 in)
1971	35.8 mm (1.4 in)
1972	25.1 mm (1.0 in)
1973	33.3 mm (1.3 in)
1974	35.3 mm (1.4 in)
1975	16.8 mm (0.7 in)
1976	21.1 mm (0.8 in)
1977	31.5 mm (1.2 in)
1978	22.9 mm (0.9 in)
1979	25.4 mm (1.0 in)
1980	36.1 mm (1.4 in)
1981	21.3 mm (0.8 in)
1982	18.0 mm (0.7 in)
1983	24.1 mm (0.9 in)
1984	30.5 mm (1.2 in)
1985	44.5 mm (1.8 in)
1986	36.8 mm (1.4 in)
1987	31.0 mm (1.2 in)
1988	16.8 mm (0.7 in)
1989	21.1 mm (0.8 in)
1990	16.8 mm (0.7 in)
1991	38.4 mm (1.5 in)
1992	39.1 mm (1.5 in)
1993	20.3 mm (0.8 in)
1994	38.4 mm (1.5 in)
1995	18.3 mm (0.7 in)
1996	28.4 mm (1.1 in)
1997	24.9 mm (1.0 in)
1998	42.9 mm (1.7 in)
1999	22.1 mm (0.9 in)
2000	35.6 mm (1.4 in)
2001	40.1 mm (1.6 in)
2002	34.5 mm (1.4 in)
2003	18.0 mm (0.7 in)
2004	31.2 mm (1.2 in)
2005	44.2 mm (1.7 in)
2006	39.4 mm (1.6 in)
2007	21.8 mm (0.9 in)
2008	36.1 mm (1.4 in)
2009	17.8 mm (0.7 in)
2010	22.9 mm (0.9 in)
2011	20.3 mm (0.8 in)
2012	25.7 mm (1.0 in)
2013	20.3 mm (0.8 in)
2014	35.6 mm (1.4 in)
2015	58.4 mm (2.3 in)
2016	47.0 mm (1.9 in)
2017	12.7 mm (0.5 in)
2018	20.3 mm (0.8 in)

Wettest five days (Rx5day)

The wettest five days of the year at Superior, 1914 to 2018. The record is 118.9 mm (4.7 in) in 2015, marked on the chart; the median year is 43.0 mm (1.7 in).

Wettest five days (Rx5day) at Superior by year
Year	Wettest five days (Rx5day)
1914	30.5 mm (1.2 in)
1915	50.2 mm (2.0 in)
1916	30.8 mm (1.2 in)
1917	80.0 mm (3.1 in)
1918	38.6 mm (1.5 in)
1919	30.5 mm (1.2 in)
1920	43.0 mm (1.7 in)
1921	34.2 mm (1.3 in)
1923	44.0 mm (1.7 in)
1924	41.1 mm (1.6 in)
1925	47.1 mm (1.9 in)
1926	32.0 mm (1.3 in)
1927	48.1 mm (1.9 in)
1928	29.5 mm (1.2 in)
1929	38.8 mm (1.5 in)
1930	34.6 mm (1.4 in)
1931	41.9 mm (1.6 in)
1932	35.1 mm (1.4 in)
1933	69.2 mm (2.7 in)
1934	49.6 mm (2.0 in)
1935	30.5 mm (1.2 in)
1936	39.1 mm (1.5 in)
1937	31.0 mm (1.2 in)
1938	54.2 mm (2.1 in)
1939	38.1 mm (1.5 in)
1940	36.6 mm (1.4 in)
1941	40.5 mm (1.6 in)
1942	55.8 mm (2.2 in)
1943	40.4 mm (1.6 in)
1944	44.8 mm (1.8 in)
1945	35.5 mm (1.4 in)
1946	46.2 mm (1.8 in)
1947	44.4 mm (1.7 in)
1948	44.7 mm (1.8 in)
1949	38.4 mm (1.5 in)
1950	54.7 mm (2.2 in)
1951	44.7 mm (1.8 in)
1952	45.2 mm (1.8 in)
1953	62.0 mm (2.4 in)
1954	33.5 mm (1.3 in)
1955	56.4 mm (2.2 in)
1956	40.4 mm (1.6 in)
1957	78.8 mm (3.1 in)
1958	34.8 mm (1.4 in)
1959	39.0 mm (1.5 in)
1960	40.7 mm (1.6 in)
1961	48.8 mm (1.9 in)
1962	63.6 mm (2.5 in)
1963	40.4 mm (1.6 in)
1964	95.4 mm (3.8 in)
1965	52.6 mm (2.1 in)
1966	80.1 mm (3.2 in)
1967	27.7 mm (1.1 in)
1968	48.9 mm (1.9 in)
1969	53.7 mm (2.1 in)
1970	40.2 mm (1.6 in)
1971	60.9 mm (2.4 in)
1972	47.0 mm (1.9 in)
1973	43.5 mm (1.7 in)
1974	92.7 mm (3.6 in)
1975	39.4 mm (1.6 in)
1976	33.8 mm (1.3 in)
1977	35.1 mm (1.4 in)
1978	37.8 mm (1.5 in)
1979	32.7 mm (1.3 in)
1980	97.5 mm (3.8 in)
1981	30.1 mm (1.2 in)
1982	40.3 mm (1.6 in)
1983	40.7 mm (1.6 in)
1984	34.5 mm (1.4 in)
1985	63.1 mm (2.5 in)
1986	55.6 mm (2.2 in)
1987	40.4 mm (1.6 in)
1988	37.2 mm (1.5 in)
1989	27.4 mm (1.1 in)
1990	33.7 mm (1.3 in)
1991	47.5 mm (1.9 in)
1992	51.4 mm (2.0 in)
1993	35.1 mm (1.4 in)
1994	53.1 mm (2.1 in)
1995	37.1 mm (1.5 in)
1996	56.4 mm (2.2 in)
1997	67.1 mm (2.6 in)
1998	67.7 mm (2.7 in)
1999	37.4 mm (1.5 in)
2000	69.7 mm (2.7 in)
2001	66.3 mm (2.6 in)
2002	48.7 mm (1.9 in)
2003	32.5 mm (1.3 in)
2004	49.5 mm (1.9 in)
2005	57.9 mm (2.3 in)
2006	48.8 mm (1.9 in)
2007	50.5 mm (2.0 in)
2008	48.2 mm (1.9 in)
2009	43.8 mm (1.7 in)
2010	35.6 mm (1.4 in)
2011	32.5 mm (1.3 in)
2012	55.9 mm (2.2 in)
2013	22.6 mm (0.9 in)
2014	40.4 mm (1.6 in)
2015	118.9 mm (4.7 in)
2016	73.1 mm (2.9 in)
2017	n/a
2018	26.0 mm (1.0 in)

Longest dry spell (CDD)

The longest dry spell of the year at Superior, 1914 to 2018. The record is 108 days in 1931, marked on the chart; the median year is 28 days.

Longest dry spell (CDD) at Superior by year
Year	Longest dry spell (CDD)
1914	17 days
1915	14 days
1916	16 days
1917	40 days
1918	18 days
1919	16 days
1920	18 days
1921	18 days
1923	30 days
1924	36 days
1925	20 days
1926	40 days
1927	21 days
1928	33 days
1929	33 days
1930	48 days
1931	108 days
1932	27 days
1933	33 days
1934	33 days
1935	25 days
1936	29 days
1937	25 days
1938	21 days
1939	46 days
1940	31 days
1941	24 days
1942	44 days
1943	32 days
1944	27 days
1945	23 days
1946	27 days
1947	20 days
1948	34 days
1949	22 days
1950	18 days
1951	37 days
1952	47 days
1953	35 days
1954	34 days
1955	50 days
1956	21 days
1957	17 days
1958	28 days
1959	23 days
1960	31 days
1961	38 days
1962	23 days
1963	27 days
1964	18 days
1965	22 days
1966	19 days
1967	84 days
1968	21 days
1969	77 days
1970	29 days
1971	23 days
1972	20 days
1973	33 days
1974	35 days
1975	27 days
1976	29 days
1977	36 days
1978	30 days
1979	35 days
1980	34 days
1981	37 days
1982	20 days
1983	17 days
1984	35 days
1985	53 days
1986	25 days
1987	60 days
1988	41 days
1989	18 days
1990	35 days
1991	36 days
1992	25 days
1993	21 days
1994	36 days
1995	23 days
1996	32 days
1997	21 days
1998	26 days
1999	38 days
2000	32 days
2001	32 days
2002	28 days
2003	25 days
2004	16 days
2005	39 days
2006	39 days
2007	23 days
2008	19 days
2009	29 days
2010	21 days
2011	39 days
2012	42 days
2013	24 days
2014	15 days
2015	16 days
2016	8 days
2017	3 days
2018	9 days

Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.

Frost Dates and Growing Season

78 years with a frost

Across 78 years with a frost, the median last spring frost at Superior falls on 22 May and the median first autumn frost on 14 September, which leaves a median of 117 days between them.

In 1978 to 2014 the median growing season was 123 days. That is 25 days more than in 1924 to 1959.

Fitted over all years, the growing season changes by +5.0 days per decade at this station.

Frost dates and growing season at Superior
Measure	Median, all years	Earliest period (1924 to 1959)	Recent period (1978 to 2014)	Recent against earliest	Fitted trend
Last spring frost	22 May	3 June	13 May	21 days earlier	-2.2 days per decade
First autumn frost	14 September	7 September	20 September	13 days later	+2.7 days per decade
Growing days	117 days	98 days	123 days	25 days more	+5.0 days per decade

A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.

Rainfall Return Levels

88 years, 1917 to 2012

A day with at least 26.5 mm (1.0 in) of rain is expected about once in 2 years. A day with at least 53.1 mm (2.1 in) of rain is expected about once in 100 years.

Rainfall return levels at Superior: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	26.5 mm (1.0 in)
5 years	34.5 mm (1.4 in)
10 years	39.4 mm (1.6 in)
25 years	45.2 mm (1.8 in)
50 years	49.3 mm (1.9 in)
100 years	53.1 mm (2.1 in)	Longer than the 88 years of record

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 88 years of values from 1917 to 2012.

A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.

The largest wettest-day totals in the fit: 51.8 mm (2.0 in) in 1953; 46.7 mm (1.8 in) in 1957; 44.5 mm (1.8 in) in 1985.

Station Changes

No change in the annual mean temperature of this station was found against its neighbours.

Download the Data

Data for Superior standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Superior threshold days by year: CSV or JSON. Field meanings are on the data page.

Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-17 (17 October 2026). Records are computed by this site and are not official.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).