Groton weather by month
What a typical year looks like in Groton, Vermont: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Plainfield, 18 km from Groton; records cover 1999–2026.
The year at a glance
- Precipitation a year
- 41 in1040 mm
- Snow a year
- Rare
- Last spring freeze
- May 21
- First fall freeze
- Sep 21
- Heating degree days
- 8,838
- Cooling degree days
- 225
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −20°−29° (heating, 99%) and 91°33° (cooling, 1%).
Month by month
Groton in January
Highs average 25°−4° and lows 3°−16°, with 2.7 in69 mm of precipitation in a typical January.
- Record high
- 58°14° (2007)
- Record low
- −33°−36° (2011)
- Heating degree days
- 1582
- Cooling degree days
- 0
Groton in February
Highs average 29°−2° and lows 4°−16°, with 2.4 in62 mm of precipitation in a typical February.
- Record high
- 68°20° (2018)
- Record low
- −29°−34° (2015)
- Heating degree days
- 1366
- Cooling degree days
- 0
Groton in March
Highs average 38°3° and lows 14°−10°, with 2.6 in66 mm of precipitation in a typical March.
- Record high
- 80°27° (2012)
- Record low
- −24°−31° (2007)
- Heating degree days
- 1201
- Cooling degree days
- 0
Groton in April
Highs average 52°11° and lows 27°−3°, with 3.2 in81 mm of precipitation in a typical April.
- Record high
- 89°32° (2002)
- Record low
- 4°−16° (2016)
- Heating degree days
- 767
- Cooling degree days
- 0
Groton in May
Highs average 66°19° and lows 39°4°, with 3.6 in91 mm of precipitation in a typical May.
- Record high
- 93°34° (2020)
- Record low
- 22°−6° (2023)
- Heating degree days
- 400
- Cooling degree days
- 6
Groton in June
Highs average 75°24° and lows 48°9°, with 4.6 in116 mm of precipitation in a typical June.
- Record high
- 98°37° (2008)
- Record low
- 30°−1° (2001)
- Heating degree days
- 149
- Cooling degree days
- 43
Groton in July
Highs average 80°27° and lows 53°12°, with 4.7 in119 mm of precipitation in a typical July.
- Record high
- 98°37° (2010)
- Record low
- 38°3° (2001)
- Heating degree days
- 47
- Cooling degree days
- 94
Groton in August
Highs average 78°26° and lows 51°11°, with 3.4 in86 mm of precipitation in a typical August.
- Record high
- 96°36° (2001)
- Record low
- 35°2° (2017)
- Heating degree days
- 77
- Cooling degree days
- 65
Groton in September
Highs average 71°21° and lows 43°6°, with 3.5 in88 mm of precipitation in a typical September.
- Record high
- 96°36° (2002)
- Record low
- 23°−5° (2000)
- Heating degree days
- 267
- Cooling degree days
- 17
Groton in OctoberThis month
Highs average 56°13° and lows 32°0°, with 4.3 in109 mm of precipitation in a typical October.
- Record high
- 86°30° (2023)
- Record low
- 13°−11° (2020)
- Heating degree days
- 653
- Cooling degree days
- 0
Groton in November
Highs average 42°5° and lows 23°−5°, with 2.8 in72 mm of precipitation in a typical November.
- Record high
- 75°24° (2024)
- Record low
- −9°−23° (2018)
- Heating degree days
- 974
- Cooling degree days
- 0
Groton in December
Highs average 31°−1° and lows 12°−11°, with 3.3 in83 mm of precipitation in a typical December.
- Record high
- 65°18° (2006)
- Record low
- −25°−32° (2013)
- Heating degree days
- 1355
- Cooling degree days
- 0