Harlem Weather Records (USC00243929)

Record envelope, standing records and threshold days for Harlem (USC00243929), Montana, United States, with 116 years of record.

Key Facts for Harlem

Harlem (USC00243929) is a weather station in Montana, United States at 48.54 latitude and -108.80 longitude, 723 m (2,371 ft) above sea level.
The station reports from 1896 to 2011, 116 years of record.
1,464 records set at Harlem still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Harlem tied a daily record high maximum temperature of 32.8 C (91.0 F) on 24 September 2011.

About the Station

Location: Montana, United States, 48.54 latitude, -108.80 longitude.
Elevation: 723 m (2,371 ft).
Period of record: 1896 to 2011, 116 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 Harlem. 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 Harlem, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	18.9 C (66.0 F)	-45.6 C (-50.1 F)	n/a	n/a
Feb	23.3 C (73.9 F)	-45.6 C (-50.1 F)	n/a	n/a
Mar	27.8 C (82.0 F)	-38.3 C (-36.9 F)	n/a	n/a
Apr	35.0 C (95.0 F)	-24.4 C (-11.9 F)	n/a	n/a
May	36.7 C (98.1 F)	-12.2 C (10.0 F)	n/a	n/a
Jun	41.7 C (107.1 F)	-3.3 C (26.1 F)	n/a	n/a
Jul	41.7 C (107.1 F)	1.7 C (35.1 F)	n/a	n/a
Aug	41.7 C (107.1 F)	-1.1 C (30.0 F)	n/a	n/a
Sep	38.9 C (102.0 F)	-10.6 C (12.9 F)	n/a	n/a
Oct	32.8 C (91.0 F)	-28.9 C (-20.0 F)	n/a	n/a
Nov	27.8 C (82.0 F)	-37.2 C (-35.0 F)	n/a	n/a
Dec	20.6 C (69.1 F)	-42.2 C (-44.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Harlem still stand. 1936 holds the most, with 69.

Standing records at Harlem by the year they were set
Year set	Standing records
1896	14
1897	7
1899	2
1900	6
1905	6
1924	17
1930	18
1931	17
1932	16
1933	22
1934	25
1935	18
1936	69
1937	13
1938	12
1939	24
1940	19
1941	14
1942	12
1943	26
1944	9
1945	11
1946	8
1947	18
1948	7
1949	22
1950	26
1951	33
1952	16
1953	12
1954	24
1955	16
1956	17
1957	13
1958	12
1959	22
1960	15
1961	18
1962	19
1963	21
1964	16
1965	19
1966	14
1967	24
1968	11
1969	25
1970	12
1971	7
1972	26
1973	11
1974	15
1975	11
1976	10
1977	18
1978	9
1979	6
1980	16
1981	15
1982	17
1983	17
1984	18
1985	36
1986	14
1987	21
1988	26
1989	15
1990	14
1991	17
1992	31
1993	12
1994	10
1995	21
1996	16
1997	14
1998	19
1999	21
2000	22
2001	22
2002	20
2003	21
2004	12
2005	13
2006	13
2007	15
2008	12
2010	2
2011	12

All-Time Record Progression

3 new records

3 all-time records were set at Harlem between 29 December 1968 and 25 September 1986. Each dot is a new record.

When Harlem set new all-time records
Date	Kind	Detail
1968-12-29	Record low maximum temperature	Record low maximum temperature -32.8 C (-27.0 F)
1978-07-03	Record daily precipitation	Record daily precipitation 95.5 mm (3.8 in)
1986-09-25	Record daily precipitation	Record daily precipitation 146.3 mm (5.8 in)

Wettest Day of Each Month

Sep: 146.3 mm (5.8 in)

The wettest day on record for each calendar month at Harlem. The most was 146.3 mm (5.8 in) on 25 September 1986.

Record daily precipitation for each month at Harlem
Month	Record daily precipitation (mm)	Date
Jan	25.4 mm (1.0 in)	3 January 2011
Feb	27.9 mm (1.1 in)	20 February 1897
Mar	39.4 mm (1.6 in)	4 March 2006
Apr	33.8 mm (1.3 in)	9 April 2005
May	47.0 mm (1.9 in)	29 May 1982
Jun	81.3 mm (3.2 in)	6 June 1995
Jul	95.5 mm (3.8 in)	3 July 1978
Aug	62.2 mm (2.4 in)	20 August 1966
Sep	146.3 mm (5.8 in)	25 September 1986
Oct	23.4 mm (0.9 in)	14 October 1962
Nov	25.4 mm (1.0 in)	18 November 1941
Dec	25.4 mm (1.0 in)	30 December 2010

Period of Record Coverage

1896 to 2011

88 years of record at Harlem, 1896 to 2011. 31 years have data for under 90 percent of days and are left out of rankings: 1896, 1897, 1899, 1900, 1905, 1933, 1948, 1951 and others.

Days with data per year at Harlem
Year	Days with data	Share of year	Complete
1896	59	16%	No
1897	85	23%	No
1899	31	8%	No
1900	56	15%	No
1905	70	19%	No
1924	351	96%	Yes
1930	330	90%	Yes
1931	365	100%	Yes
1932	365	100%	Yes
1933	304	83%	No
1934	331	91%	Yes
1935	358	98%	Yes
1936	364	99%	Yes
1937	353	97%	Yes
1938	363	99%	Yes
1939	349	96%	Yes
1940	366	100%	Yes
1941	364	100%	Yes
1942	353	97%	Yes
1943	362	99%	Yes
1944	366	100%	Yes
1945	362	99%	Yes
1946	363	99%	Yes
1947	358	98%	Yes
1948	323	88%	No
1949	350	96%	Yes
1950	333	91%	Yes
1951	312	85%	No
1952	366	100%	Yes
1953	361	99%	Yes
1954	361	99%	Yes
1955	358	98%	Yes
1956	363	99%	Yes
1957	362	99%	Yes
1958	363	99%	Yes
1959	364	100%	Yes
1960	366	100%	Yes
1961	365	100%	Yes
1962	365	100%	Yes
1963	365	100%	Yes
1964	365	100%	Yes
1965	363	99%	Yes
1966	363	99%	Yes
1967	362	99%	Yes
1968	366	100%	Yes
1969	345	95%	Yes
1970	350	96%	Yes
1971	346	95%	Yes
1972	348	95%	Yes
1973	210	58%	No
1974	300	82%	No
1975	365	100%	Yes
1976	317	87%	No
1977	250	68%	No
1978	250	68%	No
1979	324	89%	No
1980	292	80%	No
1981	355	97%	Yes
1982	353	97%	Yes
1983	352	96%	Yes
1984	357	98%	Yes
1985	329	90%	Yes
1986	350	96%	Yes
1987	290	79%	No
1988	318	87%	No
1989	317	87%	No
1990	343	94%	Yes
1991	342	94%	Yes
1992	357	98%	Yes
1993	334	92%	Yes
1994	360	99%	Yes
1995	351	96%	Yes
1996	333	91%	Yes
1997	317	87%	No
1998	314	86%	No
1999	331	91%	Yes
2000	304	83%	No
2001	308	84%	No
2002	278	76%	No
2003	301	82%	No
2004	315	86%	No
2005	318	87%	No
2006	286	78%	No
2007	313	86%	No
2008	349	95%	Yes
2009	29	8%	No
2010	91	25%	No
2011	256	70%	No

Latest Records

Latest records at Harlem
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
24 September 2011	Harlem, US	daily high max (Tie)	32.8 C (91.0 F)	tie	72 years	7 of 100 (Routine)
8 August 2011	Harlem, US	daily low min	3.3 C (37.9 F)	0.6 C (1.1 F)	30 years	20 of 100 (Routine)
23 July 2011	Harlem, US	daily low max (Tie)	22.8 C (73.0 F)	tie	86 years	9 of 100 (Routine)
10 July 2011	Harlem, US	daily low min	5.6 C (42.1 F)	1.1 C (2.0 F)	78 years	36 of 100 (Notable)
22 June 2011	Harlem, US	daily low min	0.6 C (33.1 F)	0.5 C (0.9 F)	60 years	29 of 100 (Routine)
31 May 2011	Harlem, US	daily low max	8.3 C (46.9 F)	1.1 C (2.0 F)	28 years	19 of 100 (Routine)
18 April 2011	Harlem, US	daily low max (Tie)	1.7 C (35.1 F)	tie	60 years	7 of 100 (Routine)
17 April 2011	Harlem, US	daily snowfall	6.1 cm (2.4 in)	6.1 cm (2.4 in)	86 years	48 of 100 (Notable)
17 April 2011	Harlem, US	daily rain	12.7 mm (0.5 in)	1.0 mm (0.04 in)	4 years	13 of 100 (Routine)
15 April 2011	Harlem, US	daily snowfall	3.8 cm (1.5 in)	3.8 cm (1.5 in)	86 years	20 of 100 (Routine)
23 March 2011	Harlem, US	daily snowfall	10.2 cm (4.0 in)	5.1 cm (2.0 in)	36 years	30 of 100 (Routine)
23 March 2011	Harlem, US	daily rain	15.7 mm (0.6 in)	5.5 mm (0.22 in)	5 years	20 of 100 (Routine)
2 March 2011	Harlem, US	daily rain	14.0 mm (0.6 in)	5.6 mm (0.22 in)	64 years	20 of 100 (Routine)
2 March 2011	Harlem, US	daily low max	-19.4 C (-2.9 F)	1.6 C (2.9 F)	50 years	26 of 100 (Routine)
26 February 2011	Harlem, US	daily low max	-20.0 C (-4.0 F)	2.2 C (4.0 F)	56 years	28 of 100 (Routine)
26 February 2011	Harlem, US	daily low min	-35.0 C (-31.0 F)	2.8 C (5.0 F)	48 years	27 of 100 (Routine)
25 February 2011	Harlem, US	daily low max	-18.3 C (-0.9 F)	1.6 C (2.9 F)	75 years	33 of 100 (Routine)
23 February 2011	Harlem, US	daily snowfall	5.1 cm (2.0 in)	1.3 cm (0.5 in)	53 years	29 of 100 (Routine)
13 February 2011	Harlem, US	daily high min	1.7 C (35.1 F)	1.7 C (3.1 F)	28 years	19 of 100 (Routine)
8 February 2011	Harlem, US	daily snowfall (Tie)	7.6 cm (3.0 in)	tie	72 years	7 of 100 (Routine)

Climate Trend

59 complete years, 1924 to 2008

One stripe for each of 59 complete years at Harlem, 1924 to 2008. Blue stripes are years cooler than the station's own mean of 6.0 C (42.8 F); red stripes are warmer. The coolest year was 1936, at 3.9 C (39.0 F), and the warmest was 1998, at 8.4 C (47.0 F). The strongest colour marks a difference of 2.4 C (4.3 F).

Annual mean temperature at Harlem as warming stripes, 1924 to 2008
Year	Annual mean temperature	Difference from the station mean
1924	5.5 C	-0.54 C
1931	7.3 C	+1.26 C
1932	5.0 C	-1.00 C
1935	4.0 C	-1.97 C
1936	3.9 C	-2.13 C
1937	4.1 C	-1.88 C
1938	6.2 C	+0.19 C
1940	5.7 C	-0.34 C
1941	6.8 C	+0.77 C
1942	5.4 C	-0.59 C
1943	5.1 C	-0.91 C
1944	5.6 C	-0.39 C
1945	5.0 C	-1.04 C
1946	6.7 C	+0.71 C
1947	6.2 C	+0.20 C
1952	5.3 C	-0.69 C
1953	7.7 C	+1.73 C
1954	6.1 C	+0.12 C
1955	3.9 C	-2.08 C
1956	5.6 C	-0.41 C
1957	5.8 C	-0.22 C
1958	6.3 C	+0.29 C
1959	5.0 C	-1.05 C
1960	5.4 C	-0.62 C
1961	6.7 C	+0.70 C
1962	5.8 C	-0.20 C
1963	6.3 C	+0.31 C
1964	5.6 C	-0.45 C
1965	4.2 C	-1.77 C
1966	5.2 C	-0.77 C
1967	5.9 C	-0.10 C
1968	5.9 C	-0.16 C
1969	4.1 C	-1.93 C
1970	5.3 C	-0.69 C
1971	6.0 C	-0.04 C
1972	5.1 C	-0.94 C
1975	4.5 C	-1.49 C
1982	4.1 C	-1.96 C
1983	6.4 C	+0.36 C
1984	6.7 C	+0.73 C
1986	7.3 C	+1.26 C
1988	8.1 C	+2.11 C
1990	7.4 C	+1.38 C
1991	7.5 C	+1.50 C
1992	7.7 C	+1.70 C
1994	6.5 C	+0.48 C
1995	5.9 C	-0.08 C
1996	4.2 C	-1.79 C
1997	7.4 C	+1.37 C
1998	8.4 C	+2.34 C
1999	8.2 C	+2.16 C
2000	6.7 C	+0.73 C
2001	7.3 C	+1.29 C
2003	6.7 C	+0.71 C
2004	6.1 C	+0.05 C
2005	6.9 C	+0.92 C
2006	7.9 C	+1.87 C
2007	7.4 C	+1.42 C
2008	5.8 C	-0.19 C

The annual mean temperature here has risen by 0.2 C (0.1 to 0.4) per decade over 1924 to 2008. In Fahrenheit: 0.4 F (0.2 to 0.6) per decade. The slope is a straight line fitted to 59 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Harlem
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.2 C (0.1 to 0.4) per decade	0.4 F (0.2 to 0.6) per decade	1924 to 2008	59	Rise
Mean daily maximum	0.3 C (0.1 to 0.4) per decade	0.5 F (0.2 to 0.7) per decade	1924 to 2008	59	Rise
Mean daily minimum	0.2 C (0.1 to 0.3) per decade	0.4 F (0.2 to 0.6) per decade	1924 to 2008	59	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

1896 to 2011

Yearly extremes at Harlem: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	41.7 C (107.1 F)	1933	37.8 C (100.0 F)	88
Coldest night (TNn)	-45.6 C (-50.1 F)	1936	-36.1 C (-33.0 F)	88
Wettest day (Rx1day)	146.3 mm (5.8 in)	1986	28.1 mm (1.1 in)	88
Wettest five days (Rx5day)	148.6 mm (5.9 in)	1986	45.6 mm (1.8 in)	88
Longest dry spell (CDD)	68 days	2008	40 days	88

Hottest day (TXx)

The hottest day of the year at Harlem, 1896 to 2011. The record is 41.7 C (107.1 F) in 1933, marked on the chart; the median year is 37.8 C (100.0 F).

Hottest day (TXx) at Harlem by year
Year	Hottest day (TXx)
1896	23.9 C (75.0 F)
1897	29.4 C (84.9 F)
1899	10.6 C (51.1 F)
1900	15.6 C (60.1 F)
1905	31.1 C (88.0 F)
1924	36.7 C (98.1 F)
1930	39.4 C (102.9 F)
1931	40.0 C (104.0 F)
1932	36.7 C (98.1 F)
1933	41.7 C (107.1 F)
1934	38.3 C (100.9 F)
1935	38.3 C (100.9 F)
1936	41.1 C (106.0 F)
1937	38.9 C (102.0 F)
1938	36.7 C (98.1 F)
1939	39.4 C (102.9 F)
1940	41.7 C (107.1 F)
1941	40.6 C (105.1 F)
1942	37.2 C (99.0 F)
1943	38.3 C (100.9 F)
1944	37.8 C (100.0 F)
1945	40.0 C (104.0 F)
1946	38.9 C (102.0 F)
1947	40.6 C (105.1 F)
1948	38.9 C (102.0 F)
1949	41.1 C (106.0 F)
1950	35.6 C (96.1 F)
1951	40.6 C (105.1 F)
1952	37.2 C (99.0 F)
1953	40.6 C (105.1 F)
1954	37.8 C (100.0 F)
1955	38.9 C (102.0 F)
1956	36.1 C (97.0 F)
1957	37.8 C (100.0 F)
1958	37.2 C (99.0 F)
1959	38.9 C (102.0 F)
1960	41.1 C (106.0 F)
1961	41.7 C (107.1 F)
1962	35.6 C (96.1 F)
1963	38.3 C (100.9 F)
1964	38.9 C (102.0 F)
1965	36.1 C (97.0 F)
1966	37.2 C (99.0 F)
1967	38.3 C (100.9 F)
1968	37.8 C (100.0 F)
1969	38.9 C (102.0 F)
1970	38.9 C (102.0 F)
1971	37.8 C (100.0 F)
1972	36.7 C (98.1 F)
1973	24.4 C (75.9 F)
1974	36.7 C (98.1 F)
1975	39.4 C (102.9 F)
1976	36.7 C (98.1 F)
1977	35.6 C (96.1 F)
1978	35.6 C (96.1 F)
1979	37.8 C (100.0 F)
1980	36.7 C (98.1 F)
1981	40.0 C (104.0 F)
1982	35.6 C (96.1 F)
1983	41.1 C (106.0 F)
1984	40.0 C (104.0 F)
1985	40.6 C (105.1 F)
1986	35.6 C (96.1 F)
1987	37.2 C (99.0 F)
1988	41.7 C (107.1 F)
1989	37.8 C (100.0 F)
1990	40.0 C (104.0 F)
1991	38.9 C (102.0 F)
1992	37.2 C (99.0 F)
1993	36.1 C (97.0 F)
1994	38.3 C (100.9 F)
1995	35.6 C (96.1 F)
1996	38.3 C (100.9 F)
1997	39.4 C (102.9 F)
1998	41.7 C (107.1 F)
1999	38.3 C (100.9 F)
2000	40.0 C (104.0 F)
2001	37.8 C (100.0 F)
2002	37.8 C (100.0 F)
2003	38.3 C (100.9 F)
2004	37.8 C (100.0 F)
2005	36.7 C (98.1 F)
2006	37.8 C (100.0 F)
2007	38.9 C (102.0 F)
2008	37.2 C (99.0 F)
2009	7.2 C (45.0 F)
2010	26.7 C (80.1 F)
2011	37.8 C (100.0 F)

Coldest night (TNn)

The coldest night of the year at Harlem, 1896 to 2011. The record is -45.6 C (-50.1 F) in 1936, marked on the chart; the median year is -36.1 C (-33.0 F).

Coldest night (TNn) at Harlem by year
Year	Coldest night (TNn)
1896	-26.1 C (-15.0 F)
1897	-36.7 C (-34.1 F)
1899	-33.3 C (-27.9 F)
1900	-38.3 C (-36.9 F)
1905	-7.2 C (19.0 F)
1924	-42.2 C (-44.0 F)
1930	-26.1 C (-15.0 F)
1931	-30.0 C (-22.0 F)
1932	-35.6 C (-32.1 F)
1933	-38.3 C (-36.9 F)
1934	-32.2 C (-26.0 F)
1935	-37.8 C (-36.0 F)
1936	-45.6 C (-50.1 F)
1937	-41.1 C (-42.0 F)
1938	-35.0 C (-31.0 F)
1939	-41.7 C (-43.1 F)
1940	-35.0 C (-31.0 F)
1941	-32.8 C (-27.0 F)
1942	-39.4 C (-38.9 F)
1943	-40.6 C (-41.1 F)
1944	-29.4 C (-20.9 F)
1945	-36.7 C (-34.1 F)
1946	-33.9 C (-29.0 F)
1947	-36.1 C (-33.0 F)
1948	-34.4 C (-29.9 F)
1949	-37.2 C (-35.0 F)
1950	-43.9 C (-47.0 F)
1951	-36.7 C (-34.1 F)
1952	-35.6 C (-32.1 F)
1953	-25.6 C (-14.1 F)
1954	-44.4 C (-47.9 F)
1955	-34.4 C (-29.9 F)
1956	-35.6 C (-32.1 F)
1957	-38.9 C (-38.0 F)
1958	-31.1 C (-24.0 F)
1959	-33.9 C (-29.0 F)
1960	-37.2 C (-35.0 F)
1961	-31.1 C (-24.0 F)
1962	-36.7 C (-34.1 F)
1963	-38.9 C (-38.0 F)
1964	-36.1 C (-33.0 F)
1965	-31.7 C (-25.1 F)
1966	-35.6 C (-32.1 F)
1967	-32.2 C (-26.0 F)
1968	-39.4 C (-38.9 F)
1969	-45.6 C (-50.1 F)
1970	-35.6 C (-32.1 F)
1971	-36.1 C (-33.0 F)
1972	-38.9 C (-38.0 F)
1973	-29.4 C (-20.9 F)
1974	-36.7 C (-34.1 F)
1975	-36.1 C (-33.0 F)
1976	-32.8 C (-27.0 F)
1977	-31.1 C (-24.0 F)
1978	-37.2 C (-35.0 F)
1979	-38.3 C (-36.9 F)
1980	-38.9 C (-38.0 F)
1981	-32.2 C (-26.0 F)
1982	-41.7 C (-43.1 F)
1983	-42.2 C (-44.0 F)
1984	-36.1 C (-33.0 F)
1985	-37.2 C (-35.0 F)
1986	-33.9 C (-29.0 F)
1987	-26.7 C (-16.1 F)
1988	-33.3 C (-27.9 F)
1989	-39.4 C (-38.9 F)
1990	-33.9 C (-29.0 F)
1991	-37.2 C (-35.0 F)
1992	-35.0 C (-31.0 F)
1993	-35.6 C (-32.1 F)
1994	-44.4 C (-47.9 F)
1995	-31.1 C (-24.0 F)
1996	-43.3 C (-45.9 F)
1997	-37.8 C (-36.0 F)
1998	-38.9 C (-38.0 F)
1999	-28.9 C (-20.0 F)
2000	-35.6 C (-32.1 F)
2001	-32.8 C (-27.0 F)
2002	-32.8 C (-27.0 F)
2003	-37.8 C (-36.0 F)
2004	-41.7 C (-43.1 F)
2005	-37.8 C (-36.0 F)
2006	-31.7 C (-25.1 F)
2007	-31.1 C (-24.0 F)
2008	-37.2 C (-35.0 F)
2009	-37.8 C (-36.0 F)
2010	-30.6 C (-23.1 F)
2011	-42.2 C (-44.0 F)

Wettest day (Rx1day)

The wettest day of the year at Harlem, 1896 to 2011. The record is 146.3 mm (5.8 in) in 1986, marked on the chart; the median year is 28.1 mm (1.1 in).

Wettest day (Rx1day) at Harlem by year
Year	Wettest day (Rx1day)
1896	1.0 mm (0.04 in)
1897	27.9 mm (1.1 in)
1899	5.1 mm (0.20 in)
1900	5.1 mm (0.20 in)
1905	15.2 mm (0.6 in)
1924	45.7 mm (1.8 in)
1930	29.2 mm (1.1 in)
1931	22.9 mm (0.9 in)
1932	33.8 mm (1.3 in)
1933	40.4 mm (1.6 in)
1934	26.7 mm (1.1 in)
1935	22.9 mm (0.9 in)
1936	19.8 mm (0.8 in)
1937	63.5 mm (2.5 in)
1938	69.9 mm (2.8 in)
1939	30.7 mm (1.2 in)
1940	30.5 mm (1.2 in)
1941	25.4 mm (1.0 in)
1942	64.8 mm (2.6 in)
1943	27.9 mm (1.1 in)
1944	33.0 mm (1.3 in)
1945	19.1 mm (0.8 in)
1946	21.6 mm (0.9 in)
1947	20.8 mm (0.8 in)
1948	29.2 mm (1.1 in)
1949	39.4 mm (1.6 in)
1950	22.9 mm (0.9 in)
1951	19.1 mm (0.8 in)
1952	30.5 mm (1.2 in)
1953	25.4 mm (1.0 in)
1954	24.9 mm (1.0 in)
1955	36.8 mm (1.4 in)
1956	25.7 mm (1.0 in)
1957	22.9 mm (0.9 in)
1958	21.1 mm (0.8 in)
1959	45.0 mm (1.8 in)
1960	19.1 mm (0.8 in)
1961	21.8 mm (0.9 in)
1962	27.9 mm (1.1 in)
1963	46.5 mm (1.8 in)
1964	20.8 mm (0.8 in)
1965	31.8 mm (1.3 in)
1966	62.2 mm (2.4 in)
1967	28.2 mm (1.1 in)
1968	45.0 mm (1.8 in)
1969	18.8 mm (0.7 in)
1970	22.1 mm (0.9 in)
1971	12.7 mm (0.5 in)
1972	57.7 mm (2.3 in)
1973	17.8 mm (0.7 in)
1974	37.8 mm (1.5 in)
1975	35.8 mm (1.4 in)
1976	40.4 mm (1.6 in)
1977	42.2 mm (1.7 in)
1978	95.5 mm (3.8 in)
1979	21.8 mm (0.9 in)
1980	17.8 mm (0.7 in)
1981	20.8 mm (0.8 in)
1982	47.0 mm (1.9 in)
1983	80.0 mm (3.1 in)
1984	8.6 mm (0.34 in)
1985	25.1 mm (1.0 in)
1986	146.3 mm (5.8 in)
1987	16.3 mm (0.6 in)
1988	17.0 mm (0.7 in)
1989	39.6 mm (1.6 in)
1990	63.0 mm (2.5 in)
1991	23.9 mm (0.9 in)
1992	23.4 mm (0.9 in)
1993	24.9 mm (1.0 in)
1994	33.8 mm (1.3 in)
1995	81.3 mm (3.2 in)
1996	31.2 mm (1.2 in)
1997	32.0 mm (1.3 in)
1998	68.3 mm (2.7 in)
1999	20.3 mm (0.8 in)
2000	46.7 mm (1.8 in)
2001	10.7 mm (0.4 in)
2002	30.5 mm (1.2 in)
2003	32.3 mm (1.3 in)
2004	18.5 mm (0.7 in)
2005	33.8 mm (1.3 in)
2006	39.4 mm (1.6 in)
2007	28.7 mm (1.1 in)
2008	33.0 mm (1.3 in)
2009	18.3 mm (0.7 in)
2010	25.4 mm (1.0 in)
2011	29.2 mm (1.1 in)

Wettest five days (Rx5day)

The wettest five days of the year at Harlem, 1896 to 2011. The record is 148.6 mm (5.9 in) in 1986, marked on the chart; the median year is 45.6 mm (1.8 in).

Wettest five days (Rx5day) at Harlem by year
Year	Wettest five days (Rx5day)
1896	1.0 mm (0.04 in)
1897	27.9 mm (1.1 in)
1899	7.4 mm (0.29 in)
1900	5.1 mm (0.20 in)
1905	21.9 mm (0.9 in)
1924	55.6 mm (2.2 in)
1930	36.6 mm (1.4 in)
1931	46.8 mm (1.8 in)
1932	99.7 mm (3.9 in)
1933	92.5 mm (3.6 in)
1934	51.1 mm (2.0 in)
1935	26.7 mm (1.1 in)
1936	23.4 mm (0.9 in)
1937	77.7 mm (3.1 in)
1938	94.8 mm (3.7 in)
1939	68.5 mm (2.7 in)
1940	43.8 mm (1.7 in)
1941	47.3 mm (1.9 in)
1942	79.5 mm (3.1 in)
1943	52.0 mm (2.0 in)
1944	63.0 mm (2.5 in)
1945	21.6 mm (0.9 in)
1946	43.2 mm (1.7 in)
1947	25.4 mm (1.0 in)
1948	54.6 mm (2.1 in)
1949	45.8 mm (1.8 in)
1950	38.2 mm (1.5 in)
1951	41.0 mm (1.6 in)
1952	35.1 mm (1.4 in)
1953	43.2 mm (1.7 in)
1954	52.0 mm (2.0 in)
1955	45.0 mm (1.8 in)
1956	31.5 mm (1.2 in)
1957	53.9 mm (2.1 in)
1958	25.1 mm (1.0 in)
1959	62.3 mm (2.5 in)
1960	37.7 mm (1.5 in)
1961	25.7 mm (1.0 in)
1962	38.9 mm (1.5 in)
1963	63.8 mm (2.5 in)
1964	31.8 mm (1.3 in)
1965	48.5 mm (1.9 in)
1966	63.5 mm (2.5 in)
1967	51.3 mm (2.0 in)
1968	60.7 mm (2.4 in)
1969	44.7 mm (1.8 in)
1970	43.5 mm (1.7 in)
1971	23.4 mm (0.9 in)
1972	65.3 mm (2.6 in)
1973	20.6 mm (0.8 in)
1974	63.3 mm (2.5 in)
1975	58.7 mm (2.3 in)
1976	57.4 mm (2.3 in)
1977	49.4 mm (1.9 in)
1978	104.1 mm (4.1 in)
1979	29.4 mm (1.2 in)
1980	17.8 mm (0.7 in)
1981	35.8 mm (1.4 in)
1982	87.7 mm (3.5 in)
1983	87.9 mm (3.5 in)
1984	16.2 mm (0.6 in)
1985	37.5 mm (1.5 in)
1986	148.6 mm (5.9 in)
1987	26.5 mm (1.0 in)
1988	39.6 mm (1.6 in)
1989	66.1 mm (2.6 in)
1990	75.7 mm (3.0 in)
1991	35.6 mm (1.4 in)
1992	53.6 mm (2.1 in)
1993	30.8 mm (1.2 in)
1994	34.4 mm (1.4 in)
1995	106.5 mm (4.2 in)
1996	46.2 mm (1.8 in)
1997	78.6 mm (3.1 in)
1998	91.0 mm (3.6 in)
1999	53.1 mm (2.1 in)
2000	86.1 mm (3.4 in)
2001	26.7 mm (1.1 in)
2002	54.4 mm (2.1 in)
2003	36.6 mm (1.4 in)
2004	41.1 mm (1.6 in)
2005	45.4 mm (1.8 in)
2006	50.4 mm (2.0 in)
2007	38.8 mm (1.5 in)
2008	71.7 mm (2.8 in)
2009	22.3 mm (0.9 in)
2010	32.0 mm (1.3 in)
2011	56.3 mm (2.2 in)

Longest dry spell (CDD)

The longest dry spell of the year at Harlem, 1896 to 2011. The record is 68 days in 2008, marked on the chart; the median year is 40 days.

Longest dry spell (CDD) at Harlem by year
Year	Longest dry spell (CDD)
1896	26 days
1897	13 days
1899	28 days
1900	21 days
1905	11 days
1924	42 days
1930	48 days
1931	48 days
1932	47 days
1933	51 days
1934	63 days
1935	40 days
1936	53 days
1937	41 days
1938	36 days
1939	38 days
1940	39 days
1941	39 days
1942	40 days
1943	44 days
1944	56 days
1945	38 days
1946	31 days
1947	46 days
1948	38 days
1949	49 days
1950	27 days
1951	23 days
1952	65 days
1953	60 days
1954	33 days
1955	47 days
1956	40 days
1957	29 days
1958	34 days
1959	38 days
1960	30 days
1961	29 days
1962	28 days
1963	41 days
1964	48 days
1965	54 days
1966	29 days
1967	58 days
1968	38 days
1969	44 days
1970	44 days
1971	46 days
1972	34 days
1973	59 days
1974	29 days
1975	40 days
1976	54 days
1977	32 days
1978	34 days
1979	26 days
1980	55 days
1981	35 days
1982	42 days
1983	41 days
1984	28 days
1985	44 days
1986	35 days
1987	60 days
1988	59 days
1989	29 days
1990	39 days
1991	54 days
1992	45 days
1993	29 days
1994	49 days
1995	44 days
1996	18 days
1997	40 days
1998	26 days
1999	24 days
2000	42 days
2001	45 days
2002	50 days
2003	29 days
2004	35 days
2005	65 days
2006	34 days
2007	44 days
2008	68 days
2009	28 days
2010	24 days
2011	22 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

59 years with a frost

Across 59 years with a frost, the median last spring frost at Harlem falls on 20 May and the median first autumn frost on 15 September, which leaves a median of 117 days between them.

Fitted over all years, the growing season changes by +0.6 days per decade at this station.

Frost dates and growing season at Harlem
Measure	Median, all years	Earliest period	Recent period (1966 to 2008)	Recent against earliest	Fitted trend
Last spring frost	20 May	n/a	20 May	n/a	-0.3 days per decade
First autumn frost	15 September	n/a	17 September	n/a	+0.3 days per decade
Growing days	117 days	n/a	120 days	n/a	+0.6 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

72 years, 1924 to 2008

A day with at least 29.3 mm (1.2 in) of rain is expected about once in 2 years. A day with at least 118.9 mm (4.7 in) of rain is expected about once in 100 years.

Rainfall return levels at Harlem: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	29.3 mm (1.2 in)
5 years	44.2 mm (1.7 in)
10 years	57.0 mm (2.2 in)
25 years	77.3 mm (3.0 in)
50 years	96.2 mm (3.8 in)
100 years	118.9 mm (4.7 in)	Longer than the 72 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, 72 years of values from 1924 to 2008.

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: 146.3 mm (5.8 in) in 1986; 81.3 mm (3.2 in) in 1995; 80.0 mm (3.1 in) in 1983.

Station Changes

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

Download the Data

Data for Harlem standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Harlem 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).