Willimantic weather by month
What a typical year looks like in Willimantic, Connecticut: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Storrs, 9 km from Willimantic; records cover 1888–2026.
The year at a glance
- Precipitation a year
- 49.3 in1251 mm
- Snow a year
- 39 in99 cm
- Last spring freeze
- Apr 17
- First fall freeze
- Oct 22
- Heating degree days
- 6,142
- Cooling degree days
- 570
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 2°−17° (heating, 99%) and 89°32° (cooling, 1%).
Month by month
Willimantic in January
Highs average 35°2° and lows 19°−7°, with 3.7 in93 mm of precipitation and 8 in21 cm of snow in a typical January.
- Record high
- 68°20° (1906)
- Record low
- −19°−28° (1948)
- Heating degree days
- 1181
- Cooling degree days
- 0
Willimantic in February
Highs average 37°3° and lows 20°−6°, with 3 in76 mm of precipitation and 14 in36 cm of snow in a typical February.
- Record high
- 69°21° (1954)
- Record low
- −20°−29° (1934)
- Heating degree days
- 1014
- Cooling degree days
- 0
Willimantic in March
Highs average 45°7° and lows 28°−2°, with 4.4 in111 mm of precipitation and 6 in16 cm of snow in a typical March.
- Record high
- 83°28° (1945)
- Record low
- −6°−21° (1948)
- Heating degree days
- 890
- Cooling degree days
- 0
Willimantic in April
Highs average 57°14° and lows 38°3°, with 4.2 in107 mm of precipitation and 1.7 in4.3 cm of snow in a typical April.
- Record high
- 95°35° (2023)
- Record low
- 10°−12° (1954)
- Heating degree days
- 529
- Cooling degree days
- 4
Willimantic in May
Highs average 68°20° and lows 48°9°, with 3.7 in95 mm of precipitation in a typical May.
- Record high
- 93°34° (2010)
- Record low
- 25°−4° (1900)
- Heating degree days
- 248
- Cooling degree days
- 21
Willimantic in June
Highs average 76°24° and lows 57°14°, with 4.5 in115 mm of precipitation in a typical June.
- Record high
- 96°36° (2025)
- Record low
- 35°2° (1907)
- Heating degree days
- 60
- Cooling degree days
- 99
Willimantic in July
Highs average 81°27° and lows 63°17°, with 4 in102 mm of precipitation in a typical July.
- Record high
- 101°38° (1919)
- Record low
- 42°6° (1890)
- Heating degree days
- 6
- Cooling degree days
- 212
Willimantic in August
Highs average 79°26° and lows 61°16°, with 4.3 in109 mm of precipitation in a typical August.
- Record high
- 97°36° (1949)
- Record low
- 37°3° (1940)
- Heating degree days
- 13
- Cooling degree days
- 168
Willimantic in September
Highs average 73°23° and lows 54°12°, with 4.5 in114 mm of precipitation in a typical September.
- Record high
- 97°36° (1953)
- Record low
- 26°−3° (1941)
- Heating degree days
- 110
- Cooling degree days
- 62
Willimantic in OctoberThis month
Highs average 61°16° and lows 43°6°, with 4.6 in116 mm of precipitation and 0.3 in0.8 cm of snow in a typical October.
- Record high
- 89°32° (1908)
- Record low
- 16°−9° (1925)
- Heating degree days
- 404
- Cooling degree days
- 4
Willimantic in November
Highs average 50°10° and lows 34°1°, with 3.9 in99 mm of precipitation and 1.1 in2.8 cm of snow in a typical November.
- Record high
- 82°28° (1950)
- Record low
- 1°−17° (1938)
- Heating degree days
- 686
- Cooling degree days
- 0
Willimantic in December
Highs average 40°5° and lows 25°−4°, with 4.5 in114 mm of precipitation and 7 in18 cm of snow in a typical December.
- Record high
- 73°23° (1998)
- Record low
- −17°−27° (1917)
- Heating degree days
- 1001
- Cooling degree days
- 0