Cornish weather by month
What a typical year looks like in Cornish, Maine: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Hollis, 20 km from Cornish; records cover 1994–2026.
The year at a glance
- Precipitation a year
- 52.1 in1324 mm
- Snow a year
- 81 in205 cm
- Last spring freeze
- May 14
- First fall freeze
- Sep 27
- Heating degree days
- 7,945
- Cooling degree days
- 313
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −13°−25° (heating, 99%) and 91°33° (cooling, 1%).
Month by month
Cornish in January
Highs average 29°−1° and lows 8°−13°, with 3.6 in91 mm of precipitation and 20 in50 cm of snow in a typical January.
- Record high
- 65°18° (2007)
- Record low
- −28°−33° (2018)
- Heating degree days
- 1438
- Cooling degree days
- 0
Cornish in February
Highs average 33°0° and lows 9°−13°, with 3.6 in92 mm of precipitation and 20 in52 cm of snow in a typical February.
- Record high
- 67°19° (1997)
- Record low
- −26°−32° (2003)
- Heating degree days
- 1239
- Cooling degree days
- 0
Cornish in March
Highs average 41°5° and lows 19°−7°, with 4.6 in116 mm of precipitation and 15 in39 cm of snow in a typical March.
- Record high
- 85°29° (2012)
- Record low
- −16°−27° (2007)
- Heating degree days
- 1091
- Cooling degree days
- 0
Cornish in April
Highs average 54°12° and lows 30°−1°, with 4.9 in123 mm of precipitation and 4 in9 cm of snow in a typical April.
- Record high
- 93°34° (2009)
- Record low
- 10°−12° (2016)
- Heating degree days
- 700
- Cooling degree days
- 1
Cornish in May
Highs average 66°19° and lows 41°5°, with 3.9 in100 mm of precipitation and 0.1 in0.3 cm of snow in a typical May.
- Record high
- 94°34° (2017)
- Record low
- 24°−4° (2008)
- Heating degree days
- 373
- Cooling degree days
- 8
Cornish in June
Highs average 75°24° and lows 51°10°, with 4.5 in113 mm of precipitation in a typical June.
- Record high
- 99°37° (2025)
- Record low
- 30°−1° (2020)
- Heating degree days
- 122
- Cooling degree days
- 56
Cornish in July
Highs average 80°27° and lows 57°14°, with 4.1 in105 mm of precipitation in a typical July.
- Record high
- 98°37° (2011)
- Record low
- 42°6° (2001)
- Heating degree days
- 26
- Cooling degree days
- 131
Cornish in August
Highs average 79°26° and lows 54°12°, with 3.8 in97 mm of precipitation in a typical August.
- Record high
- 98°37° (2002)
- Record low
- 37°3° (2007)
- Heating degree days
- 47
- Cooling degree days
- 92
Cornish in September
Highs average 71°21° and lows 46°8°, with 4 in102 mm of precipitation in a typical September.
- Record high
- 94°34° (1999)
- Record low
- 24°−4° (2000)
- Heating degree days
- 226
- Cooling degree days
- 24
Cornish in OctoberThis month
Highs average 58°14° and lows 35°2°, with 5.8 in146 mm of precipitation and 0.4 in1 cm of snow in a typical October.
- Record high
- 85°29° (1995)
- Record low
- 16°−9° (2020)
- Heating degree days
- 577
- Cooling degree days
- 1
Cornish in November
Highs average 46°8° and lows 26°−3°, with 4.5 in114 mm of precipitation and 3 in9 cm of snow in a typical November.
- Record high
- 76°24° (2024)
- Record low
- −3°−19° (2018)
- Heating degree days
- 878
- Cooling degree days
- 0
Cornish in December
Highs average 35°2° and lows 16°−9°, with 4.9 in124 mm of precipitation and 18 in45 cm of snow in a typical December.
- Record high
- 70°21° (1998)
- Record low
- −23°−31° (2017)
- Heating degree days
- 1228
- Cooling degree days
- 0