Groton Long Point weather by month
What a typical year looks like in Groton Long Point, Connecticut: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at NORWICH PUBLIC UTILITY PLANT, 24 km from Groton Long Point; records cover 1956–2026.
The year at a glance
- Precipitation a year
- 52.2 in1325 mm
- Snow a year
- 28 in71 cm
- Last spring freeze
- Apr 17
- First fall freeze
- Oct 19
- Heating degree days
- 5,580
- Cooling degree days
- 802
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 4°−16° (heating, 99%) and 94°34° (cooling, 1%).
Month by month
Groton Long Point in January
Highs average 38°3° and lows 21°−6°, with 3.9 in99 mm of precipitation and 9 in23 cm of snow in a typical January.
- Record high
- 70°21° (2020)
- Record low
- −21°−29° (1994)
- Heating degree days
- 1102
- Cooling degree days
- 0
Groton Long Point in February
Highs average 41°5° and lows 23°−5°, with 3.8 in95 mm of precipitation and 7 in18 cm of snow in a typical February.
- Record high
- 72°22° (1981)
- Record low
- −17°−27° (1996)
- Heating degree days
- 932
- Cooling degree days
- 0
Groton Long Point in March
Highs average 48°9° and lows 29°−1°, with 5.1 in129 mm of precipitation and 5 in13 cm of snow in a typical March.
- Record high
- 85°29° (1998)
- Record low
- −1°−18° (1962)
- Heating degree days
- 818
- Cooling degree days
- 0
Groton Long Point in April
Highs average 59°15° and lows 39°4°, with 4.7 in120 mm of precipitation and 0.8 in2 cm of snow in a typical April.
- Record high
- 94°34° (2002)
- Record low
- 17°−8° (1964)
- Heating degree days
- 477
- Cooling degree days
- 3
Groton Long Point in May
Highs average 70°21° and lows 49°9°, with 3.6 in92 mm of precipitation in a typical May.
- Record high
- 98°37° (1996)
- Record low
- 27°−3° (1985)
- Heating degree days
- 203
- Cooling degree days
- 29
Groton Long Point in June
Highs average 78°26° and lows 59°15°, with 4.3 in108 mm of precipitation in a typical June.
- Record high
- 101°38° (2025)
- Record low
- 33°1° (1983)
- Heating degree days
- 34
- Cooling degree days
- 138
Groton Long Point in July
Highs average 84°29° and lows 65°18°, with 3.6 in92 mm of precipitation in a typical July.
- Record high
- 101°38° (1991)
- Record low
- 43°6° (1988)
- Heating degree days
- 2
- Cooling degree days
- 294
Groton Long Point in August
Highs average 83°28° and lows 63°17°, with 4.4 in112 mm of precipitation in a typical August.
- Record high
- 102°39° (2001)
- Record low
- 40°4° (1957)
- Heating degree days
- 4
- Cooling degree days
- 242
Groton Long Point in September
Highs average 76°24° and lows 55°13°, with 4.8 in122 mm of precipitation in a typical September.
- Record high
- 97°36° (1983)
- Record low
- 29°−2° (1957)
- Heating degree days
- 82
- Cooling degree days
- 87
Groton Long Point in OctoberThis month
Highs average 64°18° and lows 44°6°, with 4.9 in123 mm of precipitation in a typical October.
- Record high
- 88°31° (1956)
- Record low
- 18°−8° (1980)
- Heating degree days
- 358
- Cooling degree days
- 9
Groton Long Point in November
Highs average 53°12° and lows 34°1°, with 4.2 in106 mm of precipitation and 0.3 in0.8 cm of snow in a typical November.
- Record high
- 80°27° (2022)
- Record low
- 6°−14° (1989)
- Heating degree days
- 641
- Cooling degree days
- 0
Groton Long Point in December
Highs average 43°6° and lows 27°−3°, with 5 in126 mm of precipitation and 6 in14 cm of snow in a typical December.
- Record high
- 77°25° (1998)
- Record low
- −13°−25° (1980)
- Heating degree days
- 927
- Cooling degree days
- 0