Wilmington weather by month
What a typical year looks like in Wilmington, Massachusetts: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Bedford Hanscom Field, 15 km from Wilmington; records cover 1949–2026.
The year at a glance
- Precipitation a year
- 42.6 in1082 mm
- Snow a year
- Rare
- Last spring freeze
- May 5
- First fall freeze
- Oct 8
- Heating degree days
- 5,997
- Cooling degree days
- 742
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −2°−19° (heating, 99%) and 94°34° (cooling, 1%).
Month by month
Wilmington in January
Highs average 37°3° and lows 18°−8°, with 2.9 in74 mm of precipitation in a typical January.
- Record high
- 72°22° (2020)
- Record low
- −20°−29° (1957)
- Heating degree days
- 1162
- Cooling degree days
- 0
Wilmington in February
Highs average 39°4° and lows 19°−7°, with 2.7 in68 mm of precipitation in a typical February.
- Record high
- 75°24° (2018)
- Record low
- −15°−26° (2015)
- Heating degree days
- 998
- Cooling degree days
- 0
Wilmington in March
Highs average 48°9° and lows 27°−3°, with 3.9 in98 mm of precipitation in a typical March.
- Record high
- 82°28° (2012)
- Record low
- −7°−22° (1967)
- Heating degree days
- 858
- Cooling degree days
- 0
Wilmington in April
Highs average 60°16° and lows 37°3°, with 3.8 in98 mm of precipitation in a typical April.
- Record high
- 93°34° (2002)
- Record low
- 6°−14° (1964)
- Heating degree days
- 501
- Cooling degree days
- 6
Wilmington in May
Highs average 70°21° and lows 47°8°, with 3.4 in85 mm of precipitation in a typical May.
- Record high
- 96°36° (2022)
- Record low
- 26°−3° (2001)
- Heating degree days
- 231
- Cooling degree days
- 31
Wilmington in June
Highs average 79°26° and lows 56°13°, with 3.7 in94 mm of precipitation in a typical June.
- Record high
- 99°37° (1952)
- Record low
- 36°2° (2002)
- Heating degree days
- 48
- Cooling degree days
- 131
Wilmington in July
Highs average 85°30° and lows 62°17°, with 3.5 in89 mm of precipitation in a typical July.
- Record high
- 102°39° (2010)
- Record low
- 42°6° (1965)
- Heating degree days
- 4
- Cooling degree days
- 269
Wilmington in August
Highs average 84°29° and lows 60°16°, with 3.5 in88 mm of precipitation in a typical August.
- Record high
- 101°38° (1955)
- Record low
- 33°1° (1965)
- Heating degree days
- 9
- Cooling degree days
- 224
Wilmington in September
Highs average 76°24° and lows 52°11°, with 3.5 in90 mm of precipitation in a typical September.
- Record high
- 101°38° (1953)
- Record low
- 28°−2° (1950)
- Heating degree days
- 112
- Cooling degree days
- 74
Wilmington in OctoberThis month
Highs average 64°18° and lows 41°5°, with 4.2 in108 mm of precipitation in a typical October.
- Record high
- 88°31° (1963)
- Record low
- 14°−10° (2020)
- Heating degree days
- 404
- Cooling degree days
- 7
Wilmington in November
Highs average 52°11° and lows 32°0°, with 3.7 in94 mm of precipitation in a typical November.
- Record high
- 84°29° (1950)
- Record low
- 7°−14° (1967)
- Heating degree days
- 678
- Cooling degree days
- 0
Wilmington in December
Highs average 42°6° and lows 24°−4°, with 3.8 in96 mm of precipitation in a typical December.
- Record high
- 76°24° (1998)
- Record low
- −15°−26° (1963)
- Heating degree days
- 992
- Cooling degree days
- 0