Willimantic Windham AP Weather Records (USW00054767)

Record envelope, standing records and threshold days for Willimantic Windham AP (USW00054767), Connecticut, United States, with 31 years of record.

Key Facts for Willimantic Windham AP

Willimantic Windham AP (USW00054767) is a weather station in Connecticut, United States at 41.74 latitude and -72.18 longitude, 75 m (246 ft) above sea level.
The station reports from 1996 to 2026, 31 years of record.
1,464 records set at Willimantic Windham AP still stand.
Records are tracked for no element yet: an element needs 30 years of data to be eligible.

About the Station

Location: Connecticut, United States, 41.74 latitude, -72.18 longitude.
Elevation: 75 m (246 ft).
Period of record: 1996 to 2026, 31 years.
Eligible elements: none yet.

Daily Record Envelope and 2026

24 days at or beyond a record

The band shows the record high and record low for each calendar day at Willimantic Windham AP. The lines show the 2026 daily maximum and minimum. 24 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Willimantic Windham AP, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	21.1 C (70.0 F)	-24.3 C (-11.7 F)	8.9 C (48.0 F)	-20.5 C (-4.9 F)
Feb	22.2 C (72.0 F)	-26.6 C (-15.9 F)	12.2 C (54.0 F)	-16.6 C (2.1 F)
Mar	30.0 C (86.0 F)	-21.7 C (-7.1 F)	20.0 C (68.0 F)	-11.0 C (12.2 F)
Apr	34.4 C (93.9 F)	-7.7 C (18.1 F)	28.3 C (82.9 F)	-4.3 C (24.3 F)
May	36.1 C (97.0 F)	-2.2 C (28.0 F)	27.8 C (82.0 F)	2.2 C (36.0 F)
Jun	36.7 C (98.1 F)	3.3 C (37.9 F)	36.7 C (98.1 F)	6.1 C (43.0 F)
Jul	37.8 C (100.0 F)	8.3 C (46.9 F)	35.0 C (95.0 F)	11.1 C (52.0 F)
Aug	38.3 C (100.9 F)	7.2 C (45.0 F)	32.8 C (91.0 F)	7.2 C (45.0 F)
Sep	35.6 C (96.1 F)	-1.0 C (30.2 F)	27.8 C (82.0 F)	5.6 C (42.1 F)
Oct	29.4 C (84.9 F)	-6.7 C (19.9 F)	29.4 C (84.9 F)	-2.2 C (28.0 F)
Nov	26.7 C (80.1 F)	-15.0 C (5.0 F)	17.2 C (63.0 F)	-6.7 C (19.9 F)
Dec	24.4 C (75.9 F)	-21.1 C (-6.0 F)	14.4 C (57.9 F)	-17.2 C (1.0 F)

Which Years Hold Standing Records

1,464 standing records

1,464 records at Willimantic Windham AP still stand. 2002 holds the most, with 82.

Standing records at Willimantic Windham AP by the year they were set
Year set	Standing records
1996	24
1997	48
1998	39
1999	49
2000	68
2001	63
2002	82
2003	56
2004	43
2005	60
2006	38
2007	56
2008	40
2009	45
2010	40
2011	44
2012	54
2013	52
2014	33
2015	80
2016	50
2017	60
2018	63
2019	33
2020	43
2021	41
2022	46
2023	44
2024	35
2025	35

Wettest Day of Each Month

Sep: 116.3 mm (4.6 in)

The wettest day on record for each calendar month at Willimantic Windham AP. The most was 116.3 mm (4.6 in) on 25 September 2018.

Record daily precipitation for each month at Willimantic Windham AP
Month	Record daily precipitation (mm)	Date
Jan	56.4 mm (2.2 in)	3 January 1999
Feb	62.2 mm (2.4 in)	13 February 2008
Mar	65.0 mm (2.6 in)	29 March 2010
Apr	77.5 mm (3.1 in)	13 April 2004
May	75.4 mm (3.0 in)	31 May 2015
Jun	100.1 mm (3.9 in)	17 June 2001
Jul	85.3 mm (3.4 in)	2 July 2009
Aug	100.3 mm (3.9 in)	28 August 2011
Sep	116.3 mm (4.6 in)	25 September 2018
Oct	88.1 mm (3.5 in)	28 October 2006
Nov	57.9 mm (2.3 in)	27 November 2013
Dec	78.5 mm (3.1 in)	18 December 2023

Period of Record Coverage

1996 to 2025

30 years of record at Willimantic Windham AP, 1996 to 2025. 1 years have data for under 90 percent of days and are left out of rankings: 1996.

Days with data per year at Willimantic Windham AP
Year	Days with data	Share of year	Complete
1996	170	46%	No
1997	356	98%	Yes
1998	363	99%	Yes
1999	359	98%	Yes
2000	363	99%	Yes
2001	364	100%	Yes
2002	361	99%	Yes
2003	365	100%	Yes
2004	331	90%	Yes
2005	361	99%	Yes
2006	361	99%	Yes
2007	363	99%	Yes
2008	360	98%	Yes
2009	357	98%	Yes
2010	364	100%	Yes
2011	364	100%	Yes
2012	365	100%	Yes
2013	361	99%	Yes
2014	365	100%	Yes
2015	365	100%	Yes
2016	351	96%	Yes
2017	365	100%	Yes
2018	365	100%	Yes
2019	363	99%	Yes
2020	362	99%	Yes
2021	365	100%	Yes
2022	365	100%	Yes
2023	364	100%	Yes
2024	365	100%	Yes
2025	361	99%	Yes

Latest Records

No records were set at this station in the latest data.

Climate Trend

27 complete years, 1997 to 2025

One stripe for each of 27 complete years at Willimantic Windham AP, 1997 to 2025. Blue stripes are years cooler than the station's own mean of 10.4 C (50.7 F); red stripes are warmer. The coolest year was 2003, at 9.1 C (48.3 F), and the warmest was 2012, at 11.8 C (53.2 F). The strongest colour marks a difference of 1.5 C (2.7 F).

Annual mean temperature at Willimantic Windham AP as warming stripes, 1997 to 2025
Year	Annual mean temperature	Difference from the station mean
1997	9.2 C	-1.19 C
1998	10.8 C	+0.42 C
1999	10.7 C	+0.29 C
2000	9.6 C	-0.79 C
2001	10.5 C	+0.13 C
2002	10.1 C	-0.24 C
2003	9.1 C	-1.29 C
2005	9.6 C	-0.79 C
2006	10.7 C	+0.38 C
2007	9.8 C	-0.58 C
2008	10.2 C	-0.15 C
2009	9.8 C	-0.52 C
2010	10.9 C	+0.56 C
2011	10.6 C	+0.27 C
2012	11.8 C	+1.41 C
2013	10.1 C	-0.31 C
2014	9.6 C	-0.76 C
2015	10.2 C	-0.12 C
2017	11.2 C	+0.84 C
2018	10.8 C	+0.47 C
2019	9.9 C	-0.44 C
2020	11.2 C	+0.83 C
2021	10.8 C	+0.44 C
2022	10.5 C	+0.13 C
2023	11.2 C	+0.83 C
2024	10.9 C	+0.58 C
2025	10.0 C	-0.33 C

This station does not have enough complete years (30 are needed) to fit a temperature trend.

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

1996 to 2026

Yearly extremes at Willimantic Windham AP: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	38.3 C (100.9 F)	2001	35.6 C (96.1 F)	31
Coldest night (TNn)	-26.6 C (-15.9 F)	2015	-20.0 C (-4.0 F)	31
Wettest day (Rx1day)	116.3 mm (4.6 in)	2018	70.4 mm (2.8 in)	29
Wettest five days (Rx5day)	186.9 mm (7.4 in)	2023	98.1 mm (3.9 in)	29
Longest dry spell (CDD)	35 days	1999	16 days	29

Hottest day (TXx)

The hottest day of the year at Willimantic Windham AP, 1996 to 2026. The record is 38.3 C (100.9 F) in 2001, marked on the chart; the median year is 35.6 C (96.1 F).

Hottest day (TXx) at Willimantic Windham AP by year
Year	Hottest day (TXx)
1996	31.1 C (88.0 F)
1997	35.0 C (95.0 F)
1998	32.2 C (90.0 F)
1999	36.1 C (97.0 F)
2000	33.3 C (91.9 F)
2001	38.3 C (100.9 F)
2002	35.6 C (96.1 F)
2003	33.9 C (93.0 F)
2004	32.8 C (91.0 F)
2005	36.1 C (97.0 F)
2006	35.6 C (96.1 F)
2007	33.9 C (93.0 F)
2008	35.6 C (96.1 F)
2009	33.3 C (91.9 F)
2010	37.2 C (99.0 F)
2011	37.8 C (100.0 F)
2012	36.7 C (98.1 F)
2013	36.1 C (97.0 F)
2014	32.2 C (90.0 F)
2015	35.6 C (96.1 F)
2016	35.6 C (96.1 F)
2017	36.1 C (97.0 F)
2018	36.7 C (98.1 F)
2019	35.6 C (96.1 F)
2020	34.4 C (93.9 F)
2021	35.0 C (95.0 F)
2022	35.0 C (95.0 F)
2023	33.9 C (93.0 F)
2024	34.4 C (93.9 F)
2025	36.7 C (98.1 F)
2026	36.1 C (97.0 F)

Coldest night (TNn)

The coldest night of the year at Willimantic Windham AP, 1996 to 2026. The record is -26.6 C (-15.9 F) in 2015, marked on the chart; the median year is -20.0 C (-4.0 F).

Coldest night (TNn) at Willimantic Windham AP by year
Year	Coldest night (TNn)
1996	-13.9 C (7.0 F)
1997	-18.3 C (-0.9 F)
1998	-18.9 C (-2.0 F)
1999	-17.8 C (0.0 F)
2000	-20.0 C (-4.0 F)
2001	-18.3 C (-0.9 F)
2002	-18.9 C (-2.0 F)
2003	-25.0 C (-13.0 F)
2004	-22.2 C (-8.0 F)
2005	-22.8 C (-9.0 F)
2006	-15.5 C (4.1 F)
2007	-17.1 C (1.2 F)
2008	-16.0 C (3.2 F)
2009	-24.3 C (-11.7 F)
2010	-17.7 C (0.1 F)
2011	-24.3 C (-11.7 F)
2012	-14.9 C (5.2 F)
2013	-21.0 C (-5.8 F)
2014	-22.7 C (-8.9 F)
2015	-26.6 C (-15.9 F)
2016	-23.2 C (-9.8 F)
2017	-21.0 C (-5.8 F)
2018	-22.1 C (-7.8 F)
2019	-18.8 C (-1.8 F)
2020	-17.7 C (0.1 F)
2021	-17.7 C (0.1 F)
2022	-22.7 C (-8.9 F)
2023	-22.7 C (-8.9 F)
2024	-16.6 C (2.1 F)
2025	-20.5 C (-4.9 F)
2026	-25.0 C (-13.0 F)

Wettest day (Rx1day)

The wettest day of the year at Willimantic Windham AP, 1996 to 2026. The record is 116.3 mm (4.6 in) in 2018, marked on the chart; the median year is 70.4 mm (2.8 in).

Wettest day (Rx1day) at Willimantic Windham AP by year
Year	Wettest day (Rx1day)
1996	n/a
1997	n/a
1998	74.9 mm (2.9 in)
1999	56.4 mm (2.2 in)
2000	58.9 mm (2.3 in)
2001	100.1 mm (3.9 in)
2002	42.4 mm (1.7 in)
2003	65.8 mm (2.6 in)
2004	77.5 mm (3.1 in)
2005	74.4 mm (2.9 in)
2006	88.1 mm (3.5 in)
2007	66.8 mm (2.6 in)
2008	98.0 mm (3.9 in)
2009	85.3 mm (3.4 in)
2010	65.0 mm (2.6 in)
2011	100.3 mm (3.9 in)
2012	37.3 mm (1.5 in)
2013	90.4 mm (3.6 in)
2014	60.7 mm (2.4 in)
2015	75.4 mm (3.0 in)
2016	48.3 mm (1.9 in)
2017	73.4 mm (2.9 in)
2018	116.3 mm (4.6 in)
2019	69.9 mm (2.8 in)
2020	70.4 mm (2.8 in)
2021	80.5 mm (3.2 in)
2022	48.5 mm (1.9 in)
2023	112.5 mm (4.4 in)
2024	56.9 mm (2.2 in)
2025	49.0 mm (1.9 in)
2026	39.6 mm (1.6 in)

Wettest five days (Rx5day)

The wettest five days of the year at Willimantic Windham AP, 1996 to 2026. The record is 186.9 mm (7.4 in) in 2023, marked on the chart; the median year is 98.1 mm (3.9 in).

Wettest five days (Rx5day) at Willimantic Windham AP by year
Year	Wettest five days (Rx5day)
1996	n/a
1997	n/a
1998	95.3 mm (3.8 in)
1999	72.5 mm (2.9 in)
2000	86.8 mm (3.4 in)
2001	100.9 mm (4.0 in)
2002	57.9 mm (2.3 in)
2003	89.3 mm (3.5 in)
2004	98.1 mm (3.9 in)
2005	147.5 mm (5.8 in)
2006	102.9 mm (4.1 in)
2007	113.9 mm (4.5 in)
2008	121.7 mm (4.8 in)
2009	96.9 mm (3.8 in)
2010	121.2 mm (4.8 in)
2011	112.9 mm (4.4 in)
2012	78.6 mm (3.1 in)
2013	150.1 mm (5.9 in)
2014	86.6 mm (3.4 in)
2015	99.6 mm (3.9 in)
2016	51.9 mm (2.0 in)
2017	134.4 mm (5.3 in)
2018	141.5 mm (5.6 in)
2019	86.7 mm (3.4 in)
2020	82.6 mm (3.3 in)
2021	127.3 mm (5.0 in)
2022	84.6 mm (3.3 in)
2023	186.9 mm (7.4 in)
2024	104.7 mm (4.1 in)
2025	79.5 mm (3.1 in)
2026	48.3 mm (1.9 in)

Longest dry spell (CDD)

The longest dry spell of the year at Willimantic Windham AP, 1996 to 2026. The record is 35 days in 1999, marked on the chart; the median year is 16 days.

Longest dry spell (CDD) at Willimantic Windham AP by year
Year	Longest dry spell (CDD)
1996	n/a
1997	n/a
1998	16 days
1999	35 days
2000	11 days
2001	29 days
2002	17 days
2003	23 days
2004	25 days
2005	15 days
2006	17 days
2007	20 days
2008	15 days
2009	12 days
2010	18 days
2011	15 days
2012	19 days
2013	12 days
2014	19 days
2015	27 days
2016	11 days
2017	17 days
2018	16 days
2019	14 days
2020	26 days
2021	16 days
2022	13 days
2023	16 days
2024	28 days
2025	16 days
2026	14 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

27 years with a frost

Across 27 years with a frost, the median last spring frost at Willimantic Windham AP falls on 1 May and the median first autumn frost on 12 October, which leaves a median of 165 days between them.

Fitted over all years, the growing season changes by +6.5 days per decade at this station.

Frost dates and growing season at Willimantic Windham AP
Measure	Median, all years	Earliest period	Recent period (1997 to 2025)	Recent against earliest	Fitted trend
Last spring frost	1 May	n/a	1 May	n/a	-3.1 days per decade
First autumn frost	12 October	n/a	12 October	n/a	+3.4 days per decade
Growing days	165 days	n/a	165 days	n/a	+6.5 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.

Download the Data

Data for Willimantic Windham AP standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Willimantic Windham 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 2026-10-16 (16 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).