Watertown AP Weather Records (USW00094790)

Record envelope, standing records and threshold days for Watertown AP (USW00094790), New York, United States, with 78 years of record.

Key Facts for Watertown AP

Watertown AP (USW00094790) is a weather station in New York, United States at 43.99 latitude and -76.03 longitude, 95 m (311 ft) above sea level.
The station reports from 1949 to 2026, 78 years of record.
1,464 records set at Watertown AP still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Watertown AP set a daily record precipitation of 40.6 mm (1.6 in) on 13 October 2026 (provisional).

Provisional Records

Records set in the last 60 days are provisional until they clear the revision window.

About the Station

Location: New York, United States, 43.99 latitude, -76.03 longitude.
Elevation: 95 m (311 ft).
Period of record: 1949 to 2026, 78 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.

Daily Record Envelope and 2026

7 days at or beyond a record

The band shows the record high and record low for each calendar day at Watertown AP. The lines show the 2026 daily maximum and minimum. 7 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Watertown AP, 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)	-41.7 C (-43.1 F)	10.6 C (51.1 F)	-36.7 C (-34.1 F)
Feb	20.6 C (69.1 F)	-38.2 C (-36.8 F)	7.8 C (46.0 F)	-37.8 C (-36.0 F)
Mar	28.9 C (84.0 F)	-31.1 C (-24.0 F)	19.4 C (66.9 F)	-19.4 C (-2.9 F)
Apr	31.7 C (89.1 F)	-14.4 C (6.1 F)	26.7 C (80.1 F)	-11.1 C (12.0 F)
May	32.8 C (91.0 F)	-7.8 C (18.0 F)	31.1 C (88.0 F)	-1.7 C (28.9 F)
Jun	35.0 C (95.0 F)	-1.7 C (28.9 F)	30.6 C (87.1 F)	2.2 C (36.0 F)
Jul	36.1 C (97.0 F)	0.6 C (33.1 F)	32.8 C (91.0 F)	8.3 C (46.9 F)
Aug	35.6 C (96.1 F)	-1.1 C (30.0 F)	30.6 C (87.1 F)	8.3 C (46.9 F)
Sep	35.6 C (96.1 F)	-5.6 C (21.9 F)	28.3 C (82.9 F)	1.7 C (35.1 F)
Oct	28.9 C (84.0 F)	-11.1 C (12.0 F)	21.7 C (71.1 F)	0.0 C (32.0 F)
Nov	25.0 C (77.0 F)	-21.6 C (-6.9 F)	n/a	n/a
Dec	20.6 C (69.1 F)	-38.3 C (-36.9 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Watertown AP still stand. 1979 holds the most, with 33.

Standing records at Watertown AP by the year they were set
Year set	Standing records
1949	29
1950	22
1951	18
1952	11
1953	27
1954	18
1955	27
1956	11
1957	22
1958	11
1959	27
1960	7
1961	28
1962	26
1963	25
1964	28
1965	25
1966	29
1967	18
1968	25
1969	23
1970	20
1971	11
1972	28
1973	27
1974	29
1975	13
1976	30
1977	16
1978	15
1979	33
1980	13
1981	26
1982	24
1983	13
1984	21
1985	8
1986	14
1987	16
1988	27
1989	26
1990	23
1991	19
1992	18
1993	20
1994	17
1995	15
1996	15
1997	14
1998	13
1999	18
2000	20
2001	14
2002	20
2003	12
2004	12
2005	17
2006	13
2007	22
2008	14
2009	7
2010	7
2011	10
2012	28
2013	15
2014	17
2015	16
2016	15
2017	28
2018	20
2019	13
2020	16
2021	13
2022	13
2023	10
2024	26
2025	16
2026	11

All-Time Record Progression

9 new records

9 all-time records were set at Watertown AP between 25 December 1980 and 21 July 2011. Each dot is a new record.

When Watertown AP set new all-time records
Date	Kind	Detail
1980-12-25	Record low minimum temperature	Record low minimum temperature -38.3 C (-36.9 F)
1981-01-03	Record low maximum temperature	Record low maximum temperature -24.4 C (-11.9 F)
1981-01-04	Record low minimum temperature	Record low minimum temperature -38.9 C (-38.0 F)
1981-08-08	Record daily precipitation	Record daily precipitation 103.9 mm (4.1 in)
1988-08-04	Record high minimum temperature	Record high minimum temperature 25.0 C (77.0 F)
1994-01-16	Record low minimum temperature	Record low minimum temperature -41.7 C (-43.1 F)
1995-12-10	Record daily snowfall	Record daily snowfall 114.3 cm (45.0 in)
2006-08-01	Record high minimum temperature	Record high minimum temperature 25.6 C (78.1 F)
2011-07-21	Record high minimum temperature	Record high minimum temperature 26.1 C (79.0 F)

Wettest Day of Each Month

Aug: 103.9 mm (4.1 in)

The wettest day on record for each calendar month at Watertown AP. The most was 103.9 mm (4.1 in) on 8 August 1981.

Record daily precipitation for each month at Watertown AP
Month	Record daily precipitation (mm)	Date
Jan	57.9 mm (2.3 in)	8 January 1998
Feb	53.8 mm (2.1 in)	16 February 1954
Mar	47.0 mm (1.9 in)	4 March 1971
Apr	49.8 mm (2.0 in)	2 April 2005
May	54.9 mm (2.2 in)	30 May 1956
Jun	83.3 mm (3.3 in)	23 June 2017
Jul	59.4 mm (2.3 in)	6 July 1959
Aug	103.9 mm (4.1 in)	8 August 1981
Sep	93.0 mm (3.7 in)	16 September 2005
Oct	93.2 mm (3.7 in)	9 October 2017
Nov	75.4 mm (3.0 in)	29 November 1963
Dec	57.4 mm (2.3 in)	10 December 1995

Period of Record Coverage

1949 to 2026

78 years of record at Watertown AP, 1949 to 2026. 3 years have data for under 90 percent of days and are left out of rankings: 1949, 1983, 2026.

Days with data per year at Watertown AP
Year	Days with data	Share of year	Complete
1949	242	66%	No
1950	365	100%	Yes
1951	364	100%	Yes
1952	366	100%	Yes
1953	364	100%	Yes
1954	365	100%	Yes
1955	364	100%	Yes
1956	366	100%	Yes
1957	365	100%	Yes
1958	362	99%	Yes
1959	365	100%	Yes
1960	363	99%	Yes
1961	364	100%	Yes
1962	363	99%	Yes
1963	365	100%	Yes
1964	366	100%	Yes
1965	365	100%	Yes
1966	365	100%	Yes
1967	365	100%	Yes
1968	366	100%	Yes
1969	365	100%	Yes
1970	364	100%	Yes
1971	365	100%	Yes
1972	366	100%	Yes
1973	365	100%	Yes
1974	365	100%	Yes
1975	364	100%	Yes
1976	366	100%	Yes
1977	365	100%	Yes
1978	365	100%	Yes
1979	365	100%	Yes
1980	366	100%	Yes
1981	365	100%	Yes
1982	363	99%	Yes
1983	273	75%	No
1984	366	100%	Yes
1985	365	100%	Yes
1986	365	100%	Yes
1987	364	100%	Yes
1988	366	100%	Yes
1989	364	100%	Yes
1990	365	100%	Yes
1991	365	100%	Yes
1992	365	100%	Yes
1993	364	100%	Yes
1994	364	100%	Yes
1995	365	100%	Yes
1996	366	100%	Yes
1997	365	100%	Yes
1998	365	100%	Yes
1999	365	100%	Yes
2000	366	100%	Yes
2001	364	100%	Yes
2002	365	100%	Yes
2003	365	100%	Yes
2004	366	100%	Yes
2005	365	100%	Yes
2006	365	100%	Yes
2007	365	100%	Yes
2008	362	99%	Yes
2009	365	100%	Yes
2010	363	99%	Yes
2011	365	100%	Yes
2012	366	100%	Yes
2013	365	100%	Yes
2014	365	100%	Yes
2015	365	100%	Yes
2016	366	100%	Yes
2017	365	100%	Yes
2018	365	100%	Yes
2019	365	100%	Yes
2020	366	100%	Yes
2021	361	99%	Yes
2022	364	100%	Yes
2023	365	100%	Yes
2024	366	100%	Yes
2025	365	100%	Yes
2026	287	79%	No

Latest Records

Latest records at Watertown AP
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
13 October 2026	Watertown AP, US	daily rain (Provisional)	40.6 mm (1.6 in)	9.4 mm (0.37 in)	20 years	24 of 100 (Routine)
24 August 2026	Watertown AP, US	daily rain (Provisional)	54.9 mm (2.2 in)	19.6 mm (0.8 in)	28 years	31 of 100 (Routine)
14 June 2026	Watertown AP, US	daily rain	41.1 mm (1.6 in)	16.2 mm (0.6 in)	21 years	32 of 100 (Routine)
10 June 2026	Watertown AP, US	daily high min	21.1 C (70.0 F)	0.5 C (0.9 F)	52 years	23 of 100 (Routine)
19 May 2026	Watertown AP, US	daily high min	18.3 C (64.9 F)	1.1 C (2.0 F)	55 years	25 of 100 (Routine)
18 May 2026	Watertown AP, US	daily high max	31.1 C (88.0 F)	1.1 C (2.0 F)	76 years	32 of 100 (Routine)
29 April 2026	Watertown AP, US	daily rain	22.6 mm (0.9 in)	1.3 mm (0.05 in)	69 years	20 of 100 (Routine)
14 April 2026	Watertown AP, US	daily rain	22.1 mm (0.9 in)	7.9 mm (0.31 in)	24 years	20 of 100 (Routine)
31 March 2026	Watertown AP, US	daily rain	43.9 mm (1.7 in)	26.6 mm (1.0 in)	9 years	49 of 100 (Notable)
10 March 2026	Watertown AP, US	daily high max	17.2 C (63.0 F)	1.6 C (2.9 F)	71 years	30 of 100 (Routine)
8 March 2026	Watertown AP, US	daily high min (Tie)	2.8 C (37.0 F)	tie	43 years	4 of 100 (Routine)
7 March 2026	Watertown AP, US	daily high min	6.1 C (43.0 F)	0.5 C (0.9 F)	8 years	9 of 100 (Routine)
20 February 2026	Watertown AP, US	daily rain	21.1 mm (0.8 in)	3.3 mm (0.13 in)	44 years	20 of 100 (Routine)
9 February 2026	Watertown AP, US	daily low min	-32.8 C (-27.0 F)	1.1 C (2.0 F)	32 years	17 of 100 (Routine)
8 February 2026	Watertown AP, US	daily low min	-37.8 C (-36.0 F)	7.8 C (14.0 F)	59 years	32 of 100 (Routine)
30 January 2026	Watertown AP, US	daily low max	-15.0 C (5.0 F)	1.1 C (2.0 F)	32 years	17 of 100 (Routine)
30 January 2026	Watertown AP, US	daily low min	-36.1 C (-33.0 F)	4.0 C (7.2 F)	4 years	12 of 100 (Routine)
29 January 2026	Watertown AP, US	daily low min	-32.8 C (-27.0 F)	2.3 C (4.1 F)	4 years	10 of 100 (Routine)
24 January 2026	Watertown AP, US	daily low min	-36.7 C (-34.1 F)	1.7 C (3.1 F)	23 years	14 of 100 (Routine)
24 January 2026	Watertown AP, US	daily low max (Tie)	-17.8 C (0.0 F)	tie	22 years	3 of 100 (Routine)

Climate Trend

75 complete years, 1950 to 2025

One stripe for each of 75 complete years at Watertown AP, 1950 to 2025. Blue stripes are years cooler than the station's own mean of 7.4 C (45.3 F); red stripes are warmer. The coolest year was 1972, at 5.9 C (42.7 F), and the warmest was 2024, at 9.6 C (49.2 F). The strongest colour marks a difference of 2.2 C (4.0 F).

Annual mean temperature at Watertown AP as warming stripes, 1950 to 2025
Year	Annual mean temperature	Difference from the station mean
1950	7.3 C	-0.07 C
1951	7.9 C	+0.54 C
1952	8.5 C	+1.08 C
1953	8.9 C	+1.56 C
1954	7.5 C	+0.16 C
1955	8.0 C	+0.59 C
1956	7.0 C	-0.40 C
1957	8.2 C	+0.83 C
1958	6.6 C	-0.76 C
1959	7.7 C	+0.30 C
1960	7.0 C	-0.36 C
1961	6.6 C	-0.80 C
1962	6.0 C	-1.43 C
1963	6.3 C	-1.08 C
1964	7.5 C	+0.14 C
1965	6.7 C	-0.69 C
1966	7.0 C	-0.40 C
1967	7.3 C	-0.09 C
1968	6.4 C	-1.00 C
1969	6.1 C	-1.33 C
1970	6.7 C	-0.66 C
1971	7.7 C	+0.30 C
1972	5.9 C	-1.46 C
1973	8.3 C	+0.89 C
1974	6.5 C	-0.87 C
1975	7.6 C	+0.21 C
1976	6.8 C	-0.55 C
1977	7.2 C	-0.23 C
1978	6.1 C	-1.28 C
1979	6.9 C	-0.46 C
1980	6.6 C	-0.83 C
1981	6.9 C	-0.49 C
1982	6.7 C	-0.72 C
1984	6.6 C	-0.75 C
1985	6.7 C	-0.66 C
1986	7.1 C	-0.28 C
1987	7.8 C	+0.41 C
1988	7.3 C	-0.12 C
1989	6.1 C	-1.26 C
1990	8.3 C	+0.93 C
1991	8.2 C	+0.78 C
1992	6.2 C	-1.16 C
1993	6.7 C	-0.68 C
1994	6.7 C	-0.65 C
1995	7.2 C	-0.21 C
1996	6.9 C	-0.49 C
1997	6.7 C	-0.73 C
1998	8.9 C	+1.48 C
1999	8.0 C	+0.64 C
2000	6.5 C	-0.93 C
2001	8.2 C	+0.77 C
2002	7.9 C	+0.51 C
2003	6.6 C	-0.82 C
2004	6.5 C	-0.87 C
2005	7.4 C	-0.01 C
2006	8.6 C	+1.18 C
2007	7.3 C	-0.05 C
2008	7.4 C	+0.02 C
2009	6.8 C	-0.59 C
2010	8.2 C	+0.82 C
2011	8.3 C	+0.95 C
2012	9.5 C	+2.16 C
2013	7.8 C	+0.44 C
2014	7.5 C	+0.12 C
2015	7.3 C	-0.07 C
2016	8.3 C	+0.95 C
2017	8.0 C	+0.64 C
2018	7.8 C	+0.39 C
2019	6.9 C	-0.52 C
2020	8.8 C	+1.39 C
2021	8.7 C	+1.33 C
2022	7.9 C	+0.48 C
2023	8.9 C	+1.49 C
2024	9.6 C	+2.19 C
2025	7.7 C	+0.35 C

The annual mean temperature here has risen by 0.13 C (0.05 to 0.22) per decade over 1950 to 2025. In Fahrenheit: 0.2 F (0.1 to 0.4) per decade. The slope is a straight line fitted to 75 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Watertown AP
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.13 C (0.05 to 0.22) per decade	0.2 F (0.1 to 0.4) per decade	1950 to 2025	75	Rise
Mean daily maximum	0.2 C (0.1 to 0.3) per decade	0.3 F (0.2 to 0.5) per decade	1950 to 2025	75	Rise
Mean daily minimum	0.08 C (-0.01 to 0.18) per decade	0.15 F (-0.02 to 0.32) per decade	1950 to 2025	75	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

1949 to 2026

Yearly extremes at Watertown AP: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	36.1 C (97.0 F)	1953	32.8 C (91.0 F)	78
Coldest night (TNn)	-41.7 C (-43.1 F)	1994	-31.9 C (-25.4 F)	78
Wettest day (Rx1day)	103.9 mm (4.1 in)	1981	47.8 mm (1.9 in)	78
Wettest five days (Rx5day)	138.4 mm (5.4 in)	2017	72.4 mm (2.8 in)	78
Longest dry spell (CDD)	32 days	1967	16 days	78

Hottest day (TXx)

The hottest day of the year at Watertown AP, 1949 to 2026. The record is 36.1 C (97.0 F) in 1953, marked on the chart; the median year is 32.8 C (91.0 F).

Hottest day (TXx) at Watertown AP by year
Year	Hottest day (TXx)
1949	35.0 C (95.0 F)
1950	31.1 C (88.0 F)
1951	31.7 C (89.1 F)
1952	32.8 C (91.0 F)
1953	36.1 C (97.0 F)
1954	31.1 C (88.0 F)
1955	35.6 C (96.1 F)
1956	31.1 C (88.0 F)
1957	32.8 C (91.0 F)
1958	31.7 C (89.1 F)
1959	32.8 C (91.0 F)
1960	31.1 C (88.0 F)
1961	32.2 C (90.0 F)
1962	32.8 C (91.0 F)
1963	33.9 C (93.0 F)
1964	34.4 C (93.9 F)
1965	34.4 C (93.9 F)
1966	35.0 C (95.0 F)
1967	33.3 C (91.9 F)
1968	32.2 C (90.0 F)
1969	32.8 C (91.0 F)
1970	34.4 C (93.9 F)
1971	33.3 C (91.9 F)
1972	31.1 C (88.0 F)
1973	33.9 C (93.0 F)
1974	31.1 C (88.0 F)
1975	33.9 C (93.0 F)
1976	31.1 C (88.0 F)
1977	33.3 C (91.9 F)
1978	33.9 C (93.0 F)
1979	32.8 C (91.0 F)
1980	32.2 C (90.0 F)
1981	30.0 C (86.0 F)
1982	31.7 C (89.1 F)
1983	31.1 C (88.0 F)
1984	30.0 C (86.0 F)
1985	32.2 C (90.0 F)
1986	31.1 C (88.0 F)
1987	33.9 C (93.0 F)
1988	35.0 C (95.0 F)
1989	30.6 C (87.1 F)
1990	32.8 C (91.0 F)
1991	31.7 C (89.1 F)
1992	30.0 C (86.0 F)
1993	33.9 C (93.0 F)
1994	34.4 C (93.9 F)
1995	33.9 C (93.0 F)
1996	31.7 C (89.1 F)
1997	31.7 C (89.1 F)
1998	31.7 C (89.1 F)
1999	34.4 C (93.9 F)
2000	28.9 C (84.0 F)
2001	33.9 C (93.0 F)
2002	34.4 C (93.9 F)
2003	33.3 C (91.9 F)
2004	30.0 C (86.0 F)
2005	33.3 C (91.9 F)
2006	32.8 C (91.0 F)
2007	35.0 C (95.0 F)
2008	32.2 C (90.0 F)
2009	31.7 C (89.1 F)
2010	32.2 C (90.0 F)
2011	32.8 C (91.0 F)
2012	35.0 C (95.0 F)
2013	32.8 C (91.0 F)
2014	32.2 C (90.0 F)
2015	32.2 C (90.0 F)
2016	32.8 C (91.0 F)
2017	32.2 C (90.0 F)
2018	33.3 C (91.9 F)
2019	32.2 C (90.0 F)
2020	35.0 C (95.0 F)
2021	31.7 C (89.1 F)
2022	32.2 C (90.0 F)
2023	33.9 C (93.0 F)
2024	32.8 C (91.0 F)
2025	32.8 C (91.0 F)
2026	32.8 C (91.0 F)

Coldest night (TNn)

The coldest night of the year at Watertown AP, 1949 to 2026. The record is -41.7 C (-43.1 F) in 1994, marked on the chart; the median year is -31.9 C (-25.4 F).

Coldest night (TNn) at Watertown AP by year
Year	Coldest night (TNn)
1949	-17.8 C (0.0 F)
1950	-26.7 C (-16.1 F)
1951	-25.6 C (-14.1 F)
1952	-23.9 C (-11.0 F)
1953	-20.6 C (-5.1 F)
1954	-28.9 C (-20.0 F)
1955	-33.9 C (-29.0 F)
1956	-24.4 C (-11.9 F)
1957	-34.4 C (-29.9 F)
1958	-26.7 C (-16.1 F)
1959	-26.7 C (-16.1 F)
1960	-25.6 C (-14.1 F)
1961	-36.1 C (-33.0 F)
1962	-32.2 C (-26.0 F)
1963	-36.1 C (-33.0 F)
1964	-26.1 C (-15.0 F)
1965	-27.8 C (-18.0 F)
1966	-30.0 C (-22.0 F)
1967	-31.1 C (-24.0 F)
1968	-37.8 C (-36.0 F)
1969	-26.1 C (-15.0 F)
1970	-35.6 C (-32.1 F)
1971	-31.7 C (-25.1 F)
1972	-33.9 C (-29.0 F)
1973	-36.7 C (-34.1 F)
1974	-28.3 C (-18.9 F)
1975	-25.6 C (-14.1 F)
1976	-35.0 C (-31.0 F)
1977	-35.6 C (-32.1 F)
1978	-31.7 C (-25.1 F)
1979	-36.7 C (-34.1 F)
1980	-38.3 C (-36.9 F)
1981	-38.9 C (-38.0 F)
1982	-33.9 C (-29.0 F)
1983	-30.0 C (-22.0 F)
1984	-37.8 C (-36.0 F)
1985	-29.4 C (-20.9 F)
1986	-32.2 C (-26.0 F)
1987	-34.4 C (-29.9 F)
1988	-28.3 C (-18.9 F)
1989	-38.3 C (-36.9 F)
1990	-26.7 C (-16.1 F)
1991	-27.2 C (-17.0 F)
1992	-31.1 C (-24.0 F)
1993	-33.9 C (-29.0 F)
1994	-41.7 C (-43.1 F)
1995	-30.6 C (-23.1 F)
1996	-34.4 C (-29.9 F)
1997	-34.4 C (-29.9 F)
1998	-30.0 C (-22.0 F)
1999	-34.4 C (-29.9 F)
2000	-31.1 C (-24.0 F)
2001	-27.8 C (-18.0 F)
2002	-28.9 C (-20.0 F)
2003	-36.1 C (-33.0 F)
2004	-36.1 C (-33.0 F)
2005	-35.6 C (-32.1 F)
2006	-31.7 C (-25.1 F)
2007	-37.2 C (-35.0 F)
2008	-27.8 C (-18.0 F)
2009	-33.9 C (-29.0 F)
2010	-31.1 C (-24.0 F)
2011	-34.4 C (-29.9 F)
2012	-31.1 C (-24.0 F)
2013	-29.9 C (-21.8 F)
2014	-38.2 C (-36.8 F)
2015	-37.7 C (-35.9 F)
2016	-38.2 C (-36.8 F)
2017	-35.5 C (-31.9 F)
2018	-36.0 C (-32.8 F)
2019	-34.3 C (-29.7 F)
2020	-29.3 C (-20.7 F)
2021	-28.8 C (-19.8 F)
2022	-32.1 C (-25.8 F)
2023	-36.0 C (-32.8 F)
2024	-26.6 C (-15.9 F)
2025	-27.8 C (-18.0 F)
2026	-37.8 C (-36.0 F)

Wettest day (Rx1day)

The wettest day of the year at Watertown AP, 1949 to 2026. The record is 103.9 mm (4.1 in) in 1981, marked on the chart; the median year is 47.8 mm (1.9 in).

Wettest day (Rx1day) at Watertown AP by year
Year	Wettest day (Rx1day)
1949	27.7 mm (1.1 in)
1950	73.7 mm (2.9 in)
1951	35.6 mm (1.4 in)
1952	40.1 mm (1.6 in)
1953	52.3 mm (2.1 in)
1954	53.8 mm (2.1 in)
1955	58.2 mm (2.3 in)
1956	54.9 mm (2.2 in)
1957	48.0 mm (1.9 in)
1958	27.9 mm (1.1 in)
1959	59.4 mm (2.3 in)
1960	34.8 mm (1.4 in)
1961	42.7 mm (1.7 in)
1962	65.3 mm (2.6 in)
1963	75.4 mm (3.0 in)
1964	43.7 mm (1.7 in)
1965	22.9 mm (0.9 in)
1966	38.1 mm (1.5 in)
1967	31.5 mm (1.2 in)
1968	46.7 mm (1.8 in)
1969	22.1 mm (0.9 in)
1970	42.4 mm (1.7 in)
1971	54.6 mm (2.1 in)
1972	51.6 mm (2.0 in)
1973	47.5 mm (1.9 in)
1974	25.4 mm (1.0 in)
1975	58.7 mm (2.3 in)
1976	41.7 mm (1.6 in)
1977	57.9 mm (2.3 in)
1978	61.7 mm (2.4 in)
1979	64.3 mm (2.5 in)
1980	43.9 mm (1.7 in)
1981	103.9 mm (4.1 in)
1982	47.0 mm (1.9 in)
1983	41.1 mm (1.6 in)
1984	50.0 mm (2.0 in)
1985	39.6 mm (1.6 in)
1986	54.4 mm (2.1 in)
1987	54.4 mm (2.1 in)
1988	34.3 mm (1.4 in)
1989	35.1 mm (1.4 in)
1990	29.7 mm (1.2 in)
1991	27.9 mm (1.1 in)
1992	48.0 mm (1.9 in)
1993	32.0 mm (1.3 in)
1994	52.6 mm (2.1 in)
1995	57.4 mm (2.3 in)
1996	66.5 mm (2.6 in)
1997	46.0 mm (1.8 in)
1998	57.9 mm (2.3 in)
1999	51.3 mm (2.0 in)
2000	33.0 mm (1.3 in)
2001	45.5 mm (1.8 in)
2002	54.1 mm (2.1 in)
2003	42.2 mm (1.7 in)
2004	63.8 mm (2.5 in)
2005	99.1 mm (3.9 in)
2006	40.4 mm (1.6 in)
2007	38.1 mm (1.5 in)
2008	39.6 mm (1.6 in)
2009	34.0 mm (1.3 in)
2010	73.7 mm (2.9 in)
2011	79.8 mm (3.1 in)
2012	66.5 mm (2.6 in)
2013	31.0 mm (1.2 in)
2014	58.2 mm (2.3 in)
2015	42.9 mm (1.7 in)
2016	41.7 mm (1.6 in)
2017	93.2 mm (3.7 in)
2018	51.8 mm (2.0 in)
2019	47.0 mm (1.9 in)
2020	37.3 mm (1.5 in)
2021	59.9 mm (2.4 in)
2022	48.8 mm (1.9 in)
2023	47.0 mm (1.9 in)
2024	70.9 mm (2.8 in)
2025	51.1 mm (2.0 in)
2026	54.9 mm (2.2 in)

Wettest five days (Rx5day)

The wettest five days of the year at Watertown AP, 1949 to 2026. The record is 138.4 mm (5.4 in) in 2017, marked on the chart; the median year is 72.4 mm (2.8 in).

Wettest five days (Rx5day) at Watertown AP by year
Year	Wettest five days (Rx5day)
1949	38.9 mm (1.5 in)
1950	75.0 mm (3.0 in)
1951	67.6 mm (2.7 in)
1952	66.2 mm (2.6 in)
1953	67.0 mm (2.6 in)
1954	73.8 mm (2.9 in)
1955	81.1 mm (3.2 in)
1956	59.9 mm (2.4 in)
1957	68.3 mm (2.7 in)
1958	53.8 mm (2.1 in)
1959	71.6 mm (2.8 in)
1960	53.5 mm (2.1 in)
1961	50.3 mm (2.0 in)
1962	101.4 mm (4.0 in)
1963	87.6 mm (3.4 in)
1964	83.0 mm (3.3 in)
1965	40.6 mm (1.6 in)
1966	54.1 mm (2.1 in)
1967	55.3 mm (2.2 in)
1968	60.2 mm (2.4 in)
1969	60.2 mm (2.4 in)
1970	68.8 mm (2.7 in)
1971	72.4 mm (2.9 in)
1972	55.7 mm (2.2 in)
1973	61.2 mm (2.4 in)
1974	42.9 mm (1.7 in)
1975	117.2 mm (4.6 in)
1976	72.3 mm (2.8 in)
1977	80.2 mm (3.2 in)
1978	82.0 mm (3.2 in)
1979	68.9 mm (2.7 in)
1980	61.9 mm (2.4 in)
1981	132.3 mm (5.2 in)
1982	75.5 mm (3.0 in)
1983	64.3 mm (2.5 in)
1984	80.1 mm (3.2 in)
1985	65.8 mm (2.6 in)
1986	72.7 mm (2.9 in)
1987	83.8 mm (3.3 in)
1988	75.0 mm (3.0 in)
1989	54.4 mm (2.1 in)
1990	52.3 mm (2.1 in)
1991	63.7 mm (2.5 in)
1992	63.7 mm (2.5 in)
1993	67.1 mm (2.6 in)
1994	99.3 mm (3.9 in)
1995	92.0 mm (3.6 in)
1996	78.7 mm (3.1 in)
1997	76.0 mm (3.0 in)
1998	109.2 mm (4.3 in)
1999	96.8 mm (3.8 in)
2000	69.4 mm (2.7 in)
2001	77.5 mm (3.1 in)
2002	62.8 mm (2.5 in)
2003	74.1 mm (2.9 in)
2004	76.8 mm (3.0 in)
2005	114.4 mm (4.5 in)
2006	59.8 mm (2.4 in)
2007	51.4 mm (2.0 in)
2008	74.0 mm (2.9 in)
2009	62.2 mm (2.4 in)
2010	103.1 mm (4.1 in)
2011	94.3 mm (3.7 in)
2012	72.6 mm (2.9 in)
2013	46.0 mm (1.8 in)
2014	73.0 mm (2.9 in)
2015	60.6 mm (2.4 in)
2016	78.8 mm (3.1 in)
2017	138.4 mm (5.4 in)
2018	52.3 mm (2.1 in)
2019	82.0 mm (3.2 in)
2020	67.0 mm (2.6 in)
2021	69.0 mm (2.7 in)
2022	83.8 mm (3.3 in)
2023	73.7 mm (2.9 in)
2024	90.2 mm (3.6 in)
2025	86.1 mm (3.4 in)
2026	73.5 mm (2.9 in)

Longest dry spell (CDD)

The longest dry spell of the year at Watertown AP, 1949 to 2026. The record is 32 days in 1967, marked on the chart; the median year is 16 days.

Longest dry spell (CDD) at Watertown AP by year
Year	Longest dry spell (CDD)
1949	14 days
1950	13 days
1951	15 days
1952	18 days
1953	30 days
1954	15 days
1955	16 days
1956	16 days
1957	24 days
1958	15 days
1959	16 days
1960	16 days
1961	22 days
1962	16 days
1963	28 days
1964	28 days
1965	16 days
1966	16 days
1967	32 days
1968	19 days
1969	29 days
1970	17 days
1971	12 days
1972	16 days
1973	29 days
1974	15 days
1975	16 days
1976	13 days
1977	16 days
1978	23 days
1979	15 days
1980	16 days
1981	17 days
1982	14 days
1983	14 days
1984	19 days
1985	16 days
1986	12 days
1987	16 days
1988	18 days
1989	12 days
1990	10 days
1991	10 days
1992	11 days
1993	12 days
1994	13 days
1995	21 days
1996	14 days
1997	14 days
1998	13 days
1999	20 days
2000	21 days
2001	22 days
2002	24 days
2003	16 days
2004	15 days
2005	24 days
2006	17 days
2007	16 days
2008	13 days
2009	18 days
2010	16 days
2011	15 days
2012	15 days
2013	14 days
2014	12 days
2015	19 days
2016	17 days
2017	21 days
2018	12 days
2019	14 days
2020	15 days
2021	16 days
2022	13 days
2023	16 days
2024	14 days
2025	15 days
2026	16 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

75 years with a frost

Across 75 years with a frost, the median last spring frost at Watertown AP falls on 13 May and the median first autumn frost on 27 September, which leaves a median of 140 days between them.

In 1996 to 2025 the median growing season was 145 days. That is 8 days more than in 1950 to 1979.

Fitted over all years, the growing season changes by +1.6 days per decade at this station.

Frost dates and growing season at Watertown AP
Measure	Median, all years	Earliest period (1950 to 1979)	Recent period (1996 to 2025)	Recent against earliest	Fitted trend
Last spring frost	13 May	13 May	13 May	no change	-0.5 days per decade
First autumn frost	27 September	26 September	4 October	8 days later	+1.1 days per decade
Growing days	140 days	137 days	145 days	8 days more	+1.6 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

75 years, 1950 to 2025

A day with at least 47.7 mm (1.9 in) of rain is expected about once in 2 years. A day with at least 98.8 mm (3.9 in) of rain is expected about once in 100 years.

Rainfall return levels at Watertown AP: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	47.7 mm (1.9 in)
5 years	62.2 mm (2.4 in)
10 years	71.5 mm (2.8 in)
25 years	82.8 mm (3.3 in)
50 years	91.0 mm (3.6 in)
100 years	98.8 mm (3.9 in)	Longer than the 75 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, 75 years of values from 1950 to 2025.

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: 103.9 mm (4.1 in) in 1981; 99.1 mm (3.9 in) in 2005; 93.2 mm (3.7 in) in 2017.

Station Changes

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

Climate Twins

2011 to 2025 against 1961 to 1990

Over 2011 to 2025, Watertown AP had a mean temperature of 8.2 C (46.8 F) and 969.6 mm (38.2 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Hart 3 WSW (United States, 834 km away), Ridgetown (Canada, 504 km away) and Welland (Canada, 284 km away).

Climate twins of Watertown AP: stations whose 1961 to 1990 climate is closest to its 2011 to 2025 climate
Twin station	Country	Distance away	Mean temperature, 1961-1990	Rain a year, 1961-1990	Climate difference
Hart 3 WSW	United States	834 km (518 mi)	8.1 C (46.7 F)	914.0 mm (36.0 in)	0.49
Ridgetown	Canada	504 km (313 mi)	8.4 C (47.0 F)	898.0 mm (35.4 in)	0.51
Welland	Canada	284 km (176 mi)	8.4 C (47.0 F)	932.6 mm (36.7 in)	0.52

Twins are stations, not cities. A twin is one of the three stations at least 100 km away whose earlier climate is closest to this station's recent one, so a close match does not mean the two places look alike in other ways. A station move or a gap in a record can change that station's averages. The list describes past climate; it is not a forecast and does not say what caused any change. How twins are found, and a search for any station.

Download the Data

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