Orono Weather Records (CA006155854)

Record envelope, standing records and threshold days for Orono (CA006155854), Ontario, Canada, with 74 years of record.

Key Facts for Orono

Orono (CA006155854) is a weather station in Ontario, Canada at 43.97 latitude and -78.62 longitude, 148 m (486 ft) above sea level.
The station reports from 1923 to 1996, 74 years of record.
1,464 records set at Orono still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Orono set a daily record low minimum temperature of -30.0 C (-22.0 F) on 25 December 1983.

About the Station

Location: Ontario, Canada, 43.97 latitude, -78.62 longitude.
Elevation: 148 m (486 ft).
Period of record: 1923 to 1996, 74 years.
Eligible elements: tmax, tmin, prcp, snow.

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 Orono. 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 Orono, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	12.8 C (55.0 F)	-33.0 C (-27.4 F)	n/a	n/a
Feb	15.0 C (59.0 F)	-34.4 C (-29.9 F)	n/a	n/a
Mar	22.2 C (72.0 F)	-28.3 C (-18.9 F)	n/a	n/a
Apr	28.9 C (84.0 F)	-15.0 C (5.0 F)	n/a	n/a
May	32.2 C (90.0 F)	-6.1 C (21.0 F)	n/a	n/a
Jun	35.0 C (95.0 F)	0.0 C (32.0 F)	n/a	n/a
Jul	39.4 C (102.9 F)	2.8 C (37.0 F)	n/a	n/a
Aug	36.1 C (97.0 F)	0.0 C (32.0 F)	n/a	n/a
Sep	34.4 C (93.9 F)	-5.0 C (23.0 F)	n/a	n/a
Oct	27.2 C (81.0 F)	-12.8 C (9.0 F)	n/a	n/a
Nov	22.8 C (73.0 F)	-21.1 C (-6.0 F)	n/a	n/a
Dec	17.0 C (62.6 F)	-32.2 C (-26.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Orono still stand. 1933 holds the most, with 40.

Standing records at Orono by the year they were set
Year set	Standing records
1923	24
1924	25
1925	39
1926	38
1927	16
1928	21
1929	32
1930	32
1931	25
1932	25
1933	40
1934	37
1935	32
1936	37
1937	16
1938	19
1939	18
1940	29
1941	16
1942	24
1943	19
1944	15
1945	37
1946	29
1947	22
1948	15
1949	35
1950	25
1951	27
1952	18
1953	25
1954	29
1955	26
1956	26
1957	26
1958	13
1959	33
1960	4
1961	19
1962	25
1963	16
1964	23
1965	31
1966	21
1967	19
1968	18
1969	13
1970	22
1971	18
1972	20
1973	14
1974	18
1975	18
1976	28
1977	26
1978	15
1979	28
1980	21
1981	24
1982	25
1983	33

All-Time Record Progression

2 new records

2 all-time records were set at Orono between 13 August 1955 and 19 May 1959. Each dot is a new record.

When Orono set new all-time records
Date	Kind	Detail
1955-08-13	Record daily precipitation	Record daily precipitation 67.3 mm (2.6 in)
1959-05-19	Record daily precipitation	Record daily precipitation 72.1 mm (2.8 in)

Wettest Day of Each Month

May: 72.1 mm (2.8 in)

The wettest day on record for each calendar month at Orono. The most was 72.1 mm (2.8 in) on 19 May 1959.

Record daily precipitation for each month at Orono
Month	Record daily precipitation (mm)	Date
Jan	50.0 mm (2.0 in)	13 January 1937
Feb	44.2 mm (1.7 in)	13 February 1948
Mar	54.9 mm (2.2 in)	19 March 1948
Apr	48.5 mm (1.9 in)	15 April 1954
May	72.1 mm (2.8 in)	19 May 1959
Jun	60.5 mm (2.4 in)	28 June 1957
Jul	63.5 mm (2.5 in)	12 July 1964
Aug	67.3 mm (2.6 in)	13 August 1955
Sep	62.2 mm (2.4 in)	19 September 1953
Oct	65.8 mm (2.6 in)	14 October 1955
Nov	51.8 mm (2.0 in)	10 November 1932
Dec	45.0 mm (1.8 in)	12 December 1972

Period of Record Coverage

1923 to 1983

61 years of record at Orono, 1923 to 1983. 1 years have data for under 90 percent of days and are left out of rankings: 1923.

Days with data per year at Orono
Year	Days with data	Share of year	Complete
1923	259	71%	No
1924	366	100%	Yes
1925	365	100%	Yes
1926	365	100%	Yes
1927	365	100%	Yes
1928	366	100%	Yes
1929	365	100%	Yes
1930	365	100%	Yes
1931	365	100%	Yes
1932	366	100%	Yes
1933	365	100%	Yes
1934	365	100%	Yes
1935	365	100%	Yes
1936	366	100%	Yes
1937	365	100%	Yes
1938	365	100%	Yes
1939	364	100%	Yes
1940	366	100%	Yes
1941	365	100%	Yes
1942	365	100%	Yes
1943	365	100%	Yes
1944	365	100%	Yes
1945	365	100%	Yes
1946	365	100%	Yes
1947	364	100%	Yes
1948	365	100%	Yes
1949	365	100%	Yes
1950	365	100%	Yes
1951	365	100%	Yes
1952	366	100%	Yes
1953	365	100%	Yes
1954	365	100%	Yes
1955	361	99%	Yes
1956	366	100%	Yes
1957	362	99%	Yes
1958	360	99%	Yes
1959	358	98%	Yes
1960	364	99%	Yes
1961	365	100%	Yes
1962	363	99%	Yes
1963	364	100%	Yes
1964	364	99%	Yes
1965	364	100%	Yes
1966	365	100%	Yes
1967	365	100%	Yes
1968	364	99%	Yes
1969	365	100%	Yes
1970	365	100%	Yes
1971	365	100%	Yes
1972	366	100%	Yes
1973	365	100%	Yes
1974	364	100%	Yes
1975	364	100%	Yes
1976	365	100%	Yes
1977	365	100%	Yes
1978	365	100%	Yes
1979	365	100%	Yes
1980	363	99%	Yes
1981	357	98%	Yes
1982	357	98%	Yes
1983	360	99%	Yes

Latest Records

Latest records at Orono
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
25 December 1983	Orono, CA	daily low min	-30.0 C (-22.0 F)	5.6 C (10.1 F)	14 years	18 of 100 (Routine)
24 December 1983	Orono, CA	daily low min	-23.5 C (-10.3 F)	0.2 C (0.4 F)	40 years	18 of 100 (Routine)
11 December 1983	Orono, CA	daily rain	25.0 mm (1.0 in)	4.7 mm (0.19 in)	38 years	23 of 100 (Routine)
12 November 1983	Orono, CA	daily low max	-1.5 C (29.3 F)	2.6 C (4.7 F)	14 years	15 of 100 (Routine)
4 November 1983	Orono, CA	daily snowfall	3.8 cm (1.5 in)	1.3 cm (0.5 in)	33 years	18 of 100 (Routine)
12 October 1983	Orono, CA	daily high min	13.0 C (55.4 F)	0.8 C (1.4 F)	20 years	13 of 100 (Routine)
4 October 1983	Orono, CA	daily rain	51.8 mm (2.0 in)	32.0 mm (1.3 in)	20 years	49 of 100 (Notable)
4 October 1983	Orono, CA	daily high min	14.5 C (58.1 F)	0.1 C (0.2 F)	32 years	15 of 100 (Routine)
11 September 1983	Orono, CA	daily high min	20.0 C (68.0 F)	1.1 C (2.0 F)	36 years	18 of 100 (Routine)
6 September 1983	Orono, CA	daily high min	20.0 C (68.0 F)	1.1 C (2.0 F)	13 years	12 of 100 (Routine)
11 August 1983	Orono, CA	daily low max	17.0 C (62.6 F)	0.2 C (0.4 F)	52 years	21 of 100 (Routine)
10 August 1983	Orono, CA	daily low max (Tie)	20.0 C (68.0 F)	tie	10 years	2 of 100 (Routine)
7 August 1983	Orono, CA	daily high min	20.5 C (68.9 F)	0.5 C (0.9 F)	52 years	22 of 100 (Routine)
18 July 1983	Orono, CA	daily high min	20.0 C (68.0 F)	0.6 C (1.1 F)	14 years	11 of 100 (Routine)
17 July 1983	Orono, CA	daily rain	23.0 mm (0.9 in)	4.6 mm (0.18 in)	0 years	10 of 100 (Routine)
16 July 1983	Orono, CA	daily high max	33.0 C (91.4 F)	0.8 C (1.4 F)	29 years	16 of 100 (Routine)
15 July 1983	Orono, CA	daily high max	34.0 C (93.2 F)	2.3 C (4.1 F)	29 years	20 of 100 (Routine)
4 July 1983	Orono, CA	daily high min	20.5 C (68.9 F)	1.6 C (2.9 F)	30 years	19 of 100 (Routine)
24 June 1983	Orono, CA	daily high min	21.0 C (69.8 F)	2.1 C (3.8 F)	16 years	16 of 100 (Routine)
23 June 1983	Orono, CA	daily high min	21.0 C (69.8 F)	1.6 C (2.9 F)	60 years	28 of 100 (Routine)

Climate Trend

60 complete years, 1924 to 1983

One stripe for each of 60 complete years at Orono, 1924 to 1983. Blue stripes are years cooler than the station's own mean of 6.8 C (44.2 F); red stripes are warmer. The coolest year was 1926, at 5.0 C (40.9 F), and the warmest was 1953, at 8.6 C (47.4 F). The strongest colour marks a difference of 1.9 C (3.4 F).

Annual mean temperature at Orono as warming stripes, 1924 to 1983
Year	Annual mean temperature	Difference from the station mean
1924	5.4 C	-1.34 C
1925	6.1 C	-0.68 C
1926	5.0 C	-1.80 C
1927	6.7 C	-0.11 C
1928	6.4 C	-0.36 C
1929	5.8 C	-0.94 C
1930	6.8 C	+0.07 C
1931	8.1 C	+1.35 C
1932	7.2 C	+0.42 C
1933	7.2 C	+0.42 C
1934	6.1 C	-0.63 C
1935	6.3 C	-0.42 C
1936	6.3 C	-0.44 C
1937	7.4 C	+0.65 C
1938	7.4 C	+0.64 C
1939	6.6 C	-0.19 C
1940	5.6 C	-1.19 C
1941	6.9 C	+0.17 C
1942	6.8 C	+0.08 C
1943	5.6 C	-1.12 C
1944	6.8 C	+0.06 C
1945	6.2 C	-0.61 C
1946	7.3 C	+0.55 C
1947	6.8 C	+0.05 C
1948	7.0 C	+0.19 C
1949	8.0 C	+1.24 C
1950	6.4 C	-0.32 C
1951	7.3 C	+0.50 C
1952	8.0 C	+1.24 C
1953	8.6 C	+1.82 C
1954	7.3 C	+0.57 C
1955	8.0 C	+1.19 C
1956	6.5 C	-0.22 C
1957	7.4 C	+0.60 C
1958	6.5 C	-0.22 C
1959	7.2 C	+0.45 C
1960	6.7 C	-0.05 C
1961	6.9 C	+0.17 C
1962	6.8 C	+0.07 C
1963	6.2 C	-0.58 C
1964	7.1 C	+0.36 C
1965	6.5 C	-0.22 C
1966	6.9 C	+0.17 C
1967	6.5 C	-0.25 C
1968	6.7 C	-0.02 C
1969	6.8 C	+0.01 C
1970	6.4 C	-0.38 C
1971	6.3 C	-0.43 C
1972	5.5 C	-1.22 C
1973	7.4 C	+0.65 C
1974	6.4 C	-0.40 C
1975	7.3 C	+0.50 C
1976	6.0 C	-0.73 C
1977	6.8 C	+0.08 C
1978	6.0 C	-0.72 C
1979	6.8 C	+0.03 C
1980	6.3 C	-0.50 C
1981	7.3 C	+0.50 C
1982	6.9 C	+0.09 C
1983	7.8 C	+1.05 C

The fitted trend in annual mean temperature here over 1924 to 1983 is 0.06 C (-0.05 to 0.16) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.1 F (-0.1 to 0.3) per decade. The slope is a straight line fitted to 60 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Orono
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.06 C (-0.05 to 0.16) per decade	0.1 F (-0.1 to 0.3) per decade	1924 to 1983	60	Not clearly different from zero
Mean daily maximum	0.02 C (-0.10 to 0.13) per decade	0.03 F (-0.18 to 0.24) per decade	1924 to 1983	60	Not clearly different from zero
Mean daily minimum	0.10 C (-0.01 to 0.20) per decade	0.17 F (-0.01 to 0.36) per decade	1924 to 1983	60	Not clearly different from zero

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

1923 to 1983

Yearly extremes at Orono: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	39.4 C (102.9 F)	1936	32.5 C (90.5 F)	61
Coldest night (TNn)	-34.4 C (-29.9 F)	1934	-26.1 C (-15.0 F)	61
Wettest day (Rx1day)	72.1 mm (2.8 in)	1959	46.2 mm (1.8 in)	61
Wettest five days (Rx5day)	129.3 mm (5.1 in)	1960	68.5 mm (2.7 in)	61
Longest dry spell (CDD)	36 days	1924	17 days	61

Hottest day (TXx)

The hottest day of the year at Orono, 1923 to 1983. The record is 39.4 C (102.9 F) in 1936, marked on the chart; the median year is 32.5 C (90.5 F).

Hottest day (TXx) at Orono by year
Year	Hottest day (TXx)
1923	33.9 C (93.0 F)
1924	31.1 C (88.0 F)
1925	33.9 C (93.0 F)
1926	32.2 C (90.0 F)
1927	33.3 C (91.9 F)
1928	31.1 C (88.0 F)
1929	32.8 C (91.0 F)
1930	33.9 C (93.0 F)
1931	36.1 C (97.0 F)
1932	32.2 C (90.0 F)
1933	36.1 C (97.0 F)
1934	33.3 C (91.9 F)
1935	33.3 C (91.9 F)
1936	39.4 C (102.9 F)
1937	33.3 C (91.9 F)
1938	32.2 C (90.0 F)
1939	32.8 C (91.0 F)
1940	31.1 C (88.0 F)
1941	35.0 C (95.0 F)
1942	31.7 C (89.1 F)
1943	31.7 C (89.1 F)
1944	33.3 C (91.9 F)
1945	30.6 C (87.1 F)
1946	31.7 C (89.1 F)
1947	32.2 C (90.0 F)
1948	34.4 C (93.9 F)
1949	35.6 C (96.1 F)
1950	30.0 C (86.0 F)
1951	31.1 C (88.0 F)
1952	37.2 C (99.0 F)
1953	36.1 C (97.0 F)
1954	32.2 C (90.0 F)
1955	36.7 C (98.1 F)
1956	33.3 C (91.9 F)
1957	32.2 C (90.0 F)
1958	30.6 C (87.1 F)
1959	33.3 C (91.9 F)
1960	30.0 C (86.0 F)
1961	31.7 C (89.1 F)
1962	33.9 C (93.0 F)
1963	33.9 C (93.0 F)
1964	35.0 C (95.0 F)
1965	32.2 C (90.0 F)
1966	36.1 C (97.0 F)
1967	29.4 C (84.9 F)
1968	32.2 C (90.0 F)
1969	31.7 C (89.1 F)
1970	31.1 C (88.0 F)
1971	31.7 C (89.1 F)
1972	31.1 C (88.0 F)
1973	32.8 C (91.0 F)
1974	32.8 C (91.0 F)
1975	32.2 C (90.0 F)
1976	29.4 C (84.9 F)
1977	35.0 C (95.0 F)
1978	33.5 C (92.3 F)
1979	32.5 C (90.5 F)
1980	30.0 C (86.0 F)
1981	32.5 C (90.5 F)
1982	30.5 C (86.9 F)
1983	34.0 C (93.2 F)

Coldest night (TNn)

The coldest night of the year at Orono, 1923 to 1983. The record is -34.4 C (-29.9 F) in 1934, marked on the chart; the median year is -26.1 C (-15.0 F).

Coldest night (TNn) at Orono by year
Year	Coldest night (TNn)
1923	-12.2 C (10.0 F)
1924	-32.2 C (-26.0 F)
1925	-27.8 C (-18.0 F)
1926	-28.3 C (-18.9 F)
1927	-27.2 C (-17.0 F)
1928	-22.8 C (-9.0 F)
1929	-23.3 C (-9.9 F)
1930	-25.0 C (-13.0 F)
1931	-25.0 C (-13.0 F)
1932	-21.7 C (-7.1 F)
1933	-32.2 C (-26.0 F)
1934	-34.4 C (-29.9 F)
1935	-29.4 C (-20.9 F)
1936	-25.0 C (-13.0 F)
1937	-19.4 C (-2.9 F)
1938	-23.9 C (-11.0 F)
1939	-25.6 C (-14.1 F)
1940	-26.1 C (-15.0 F)
1941	-26.7 C (-16.1 F)
1942	-30.6 C (-23.1 F)
1943	-32.2 C (-26.0 F)
1944	-25.0 C (-13.0 F)
1945	-28.9 C (-20.0 F)
1946	-26.1 C (-15.0 F)
1947	-24.4 C (-11.9 F)
1948	-28.3 C (-18.9 F)
1949	-19.4 C (-2.9 F)
1950	-27.8 C (-18.0 F)
1951	-26.1 C (-15.0 F)
1952	-26.1 C (-15.0 F)
1953	-20.0 C (-4.0 F)
1954	-24.4 C (-11.9 F)
1955	-25.6 C (-14.1 F)
1956	-23.3 C (-9.9 F)
1957	-30.6 C (-23.1 F)
1958	-24.4 C (-11.9 F)
1959	-26.7 C (-16.1 F)
1960	-23.9 C (-11.0 F)
1961	-25.6 C (-14.1 F)
1962	-27.8 C (-18.0 F)
1963	-26.1 C (-15.0 F)
1964	-21.7 C (-7.1 F)
1965	-25.0 C (-13.0 F)
1966	-22.8 C (-9.0 F)
1967	-27.8 C (-18.0 F)
1968	-28.3 C (-18.9 F)
1969	-22.2 C (-8.0 F)
1970	-27.8 C (-18.0 F)
1971	-27.8 C (-18.0 F)
1972	-26.1 C (-15.0 F)
1973	-24.4 C (-11.9 F)
1974	-22.8 C (-9.0 F)
1975	-24.4 C (-11.9 F)
1976	-32.2 C (-26.0 F)
1977	-30.0 C (-22.0 F)
1978	-23.0 C (-9.4 F)
1979	-28.5 C (-19.3 F)
1980	-25.0 C (-13.0 F)
1981	-33.0 C (-27.4 F)
1982	-30.0 C (-22.0 F)
1983	-30.0 C (-22.0 F)

Wettest day (Rx1day)

The wettest day of the year at Orono, 1923 to 1983. The record is 72.1 mm (2.8 in) in 1959, marked on the chart; the median year is 46.2 mm (1.8 in).

Wettest day (Rx1day) at Orono by year
Year	Wettest day (Rx1day)
1923	42.9 mm (1.7 in)
1924	30.2 mm (1.2 in)
1925	50.8 mm (2.0 in)
1926	50.8 mm (2.0 in)
1927	41.9 mm (1.6 in)
1928	36.8 mm (1.4 in)
1929	37.8 mm (1.5 in)
1930	33.3 mm (1.3 in)
1931	46.2 mm (1.8 in)
1932	51.8 mm (2.0 in)
1933	27.9 mm (1.1 in)
1934	57.7 mm (2.3 in)
1935	53.6 mm (2.1 in)
1936	40.6 mm (1.6 in)
1937	50.0 mm (2.0 in)
1938	47.5 mm (1.9 in)
1939	61.5 mm (2.4 in)
1940	45.5 mm (1.8 in)
1941	42.7 mm (1.7 in)
1942	47.8 mm (1.9 in)
1943	50.5 mm (2.0 in)
1944	62.7 mm (2.5 in)
1945	61.7 mm (2.4 in)
1946	38.6 mm (1.5 in)
1947	45.2 mm (1.8 in)
1948	54.9 mm (2.2 in)
1949	37.6 mm (1.5 in)
1950	44.5 mm (1.8 in)
1951	61.5 mm (2.4 in)
1952	34.0 mm (1.3 in)
1953	62.2 mm (2.4 in)
1954	48.5 mm (1.9 in)
1955	67.3 mm (2.6 in)
1956	46.2 mm (1.8 in)
1957	60.5 mm (2.4 in)
1958	32.5 mm (1.3 in)
1959	72.1 mm (2.8 in)
1960	42.7 mm (1.7 in)
1961	37.6 mm (1.5 in)
1962	56.6 mm (2.2 in)
1963	26.2 mm (1.0 in)
1964	63.5 mm (2.5 in)
1965	45.2 mm (1.8 in)
1966	44.5 mm (1.8 in)
1967	43.4 mm (1.7 in)
1968	46.5 mm (1.8 in)
1969	38.1 mm (1.5 in)
1970	40.6 mm (1.6 in)
1971	29.2 mm (1.1 in)
1972	45.0 mm (1.8 in)
1973	30.2 mm (1.2 in)
1974	46.2 mm (1.8 in)
1975	34.3 mm (1.4 in)
1976	33.5 mm (1.3 in)
1977	48.8 mm (1.9 in)
1978	45.0 mm (1.8 in)
1979	47.0 mm (1.9 in)
1980	46.6 mm (1.8 in)
1981	46.2 mm (1.8 in)
1982	48.4 mm (1.9 in)
1983	51.8 mm (2.0 in)

Wettest five days (Rx5day)

The wettest five days of the year at Orono, 1923 to 1983. The record is 129.3 mm (5.1 in) in 1960, marked on the chart; the median year is 68.5 mm (2.7 in).

Wettest five days (Rx5day) at Orono by year
Year	Wettest five days (Rx5day)
1923	73.4 mm (2.9 in)
1924	45.5 mm (1.8 in)
1925	53.4 mm (2.1 in)
1926	55.6 mm (2.2 in)
1927	90.5 mm (3.6 in)
1928	45.4 mm (1.8 in)
1929	68.7 mm (2.7 in)
1930	62.7 mm (2.5 in)
1931	57.2 mm (2.3 in)
1932	68.1 mm (2.7 in)
1933	45.4 mm (1.8 in)
1934	58.5 mm (2.3 in)
1935	88.4 mm (3.5 in)
1936	65.8 mm (2.6 in)
1937	68.3 mm (2.7 in)
1938	81.3 mm (3.2 in)
1939	73.4 mm (2.9 in)
1940	87.7 mm (3.5 in)
1941	57.9 mm (2.3 in)
1942	67.0 mm (2.6 in)
1943	70.1 mm (2.8 in)
1944	79.5 mm (3.1 in)
1945	86.6 mm (3.4 in)
1946	52.9 mm (2.1 in)
1947	66.2 mm (2.6 in)
1948	80.8 mm (3.2 in)
1949	68.9 mm (2.7 in)
1950	82.6 mm (3.3 in)
1951	71.7 mm (2.8 in)
1952	86.0 mm (3.4 in)
1953	72.6 mm (2.9 in)
1954	71.1 mm (2.8 in)
1955	120.4 mm (4.7 in)
1956	52.1 mm (2.1 in)
1957	73.7 mm (2.9 in)
1958	49.0 mm (1.9 in)
1959	78.0 mm (3.1 in)
1960	129.3 mm (5.1 in)
1961	51.3 mm (2.0 in)
1962	68.5 mm (2.7 in)
1963	41.2 mm (1.6 in)
1964	98.8 mm (3.9 in)
1965	70.6 mm (2.8 in)
1966	82.6 mm (3.3 in)
1967	65.1 mm (2.6 in)
1968	51.8 mm (2.0 in)
1969	87.6 mm (3.4 in)
1970	59.4 mm (2.3 in)
1971	45.2 mm (1.8 in)
1972	66.6 mm (2.6 in)
1973	60.8 mm (2.4 in)
1974	71.1 mm (2.8 in)
1975	61.3 mm (2.4 in)
1976	44.7 mm (1.8 in)
1977	64.0 mm (2.5 in)
1978	65.0 mm (2.6 in)
1979	67.4 mm (2.7 in)
1980	88.6 mm (3.5 in)
1981	84.2 mm (3.3 in)
1982	69.0 mm (2.7 in)
1983	76.8 mm (3.0 in)

Longest dry spell (CDD)

The longest dry spell of the year at Orono, 1923 to 1983. The record is 36 days in 1924, marked on the chart; the median year is 17 days.

Longest dry spell (CDD) at Orono by year
Year	Longest dry spell (CDD)
1923	23 days
1924	36 days
1925	31 days
1926	12 days
1927	27 days
1928	16 days
1929	17 days
1930	18 days
1931	17 days
1932	14 days
1933	9 days
1934	17 days
1935	17 days
1936	24 days
1937	15 days
1938	14 days
1939	18 days
1940	14 days
1941	17 days
1942	17 days
1943	18 days
1944	15 days
1945	11 days
1946	20 days
1947	21 days
1948	19 days
1949	19 days
1950	14 days
1951	11 days
1952	18 days
1953	11 days
1954	19 days
1955	15 days
1956	17 days
1957	22 days
1958	17 days
1959	18 days
1960	13 days
1961	21 days
1962	24 days
1963	31 days
1964	14 days
1965	14 days
1966	20 days
1967	21 days
1968	19 days
1969	28 days
1970	16 days
1971	12 days
1972	14 days
1973	17 days
1974	19 days
1975	19 days
1976	15 days
1977	14 days
1978	17 days
1979	25 days
1980	18 days
1981	13 days
1982	14 days
1983	24 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

60 years with a frost

Across 60 years with a frost, the median last spring frost at Orono falls on 16 May and the median first autumn frost on 1 October, which leaves a median of 138 days between them.

In 1954 to 1983 the median growing season was 138 days. That is 1 day fewer than in 1924 to 1953.

Fitted over all years, the growing season changes by +1.2 days per decade at this station.

Frost dates and growing season at Orono
Measure	Median, all years	Earliest period (1924 to 1953)	Recent period (1954 to 1983)	Recent against earliest	Fitted trend
Last spring frost	16 May	16 May	16 May	no change	-1.2 days per decade
First autumn frost	1 October	30 September	3 October	3 days later	+0.1 days per decade
Growing days	138 days	139 days	138 days	1 day fewer	+1.2 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

58 years, 1924 to 1983

A day with at least 45.3 mm (1.8 in) of rain is expected about once in 2 years. A day with at least 72.7 mm (2.9 in) of rain is expected about once in 100 years.

Rainfall return levels at Orono: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	45.3 mm (1.8 in)
5 years	54.8 mm (2.2 in)
10 years	60.1 mm (2.4 in)
25 years	65.8 mm (2.6 in)
50 years	69.5 mm (2.7 in)
100 years	72.7 mm (2.9 in)	Longer than the 58 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, 58 years of values from 1924 to 1983.

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: 72.1 mm (2.8 in) in 1959; 67.3 mm (2.6 in) in 1955; 63.5 mm (2.5 in) in 1964.

Station Changes

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

Download the Data

Data for Orono standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Orono 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 2026-10-17. Last revised 17 October 2026 (2026-10-17).