North Haven weather by month
What a typical year looks like in North Haven, Connecticut: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at NEW HAVEN TWEED AP, 14 km from North Haven; records cover 1948–2026.
The year at a glance
- Precipitation a year
- 41.8 in1061 mm
- Snow a year
- Rare
- Last spring freeze
- Apr 12
- First fall freeze
- Oct 25
- Heating degree days
- 5,456
- Cooling degree days
- 763
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 7°−14° (heating, 99%) and 91°33° (cooling, 1%).
Month by month
North Haven in January
Highs average 38°3° and lows 23°−5°, with 2.7 in69 mm of precipitation in a typical January.
- Record high
- 69°21° (2020)
- Record low
- −8°−22° (1948)
- Heating degree days
- 1068
- Cooling degree days
- 0
North Haven in February
Highs average 40°5° and lows 24°−5°, with 2.8 in72 mm of precipitation in a typical February.
- Record high
- 68°20° (2023)
- Record low
- −6°−21° (2016)
- Heating degree days
- 923
- Cooling degree days
- 0
North Haven in March
Highs average 47°8° and lows 30°−1°, with 3.7 in93 mm of precipitation in a typical March.
- Record high
- 77°25° (2021)
- Record low
- 1°−17° (1948)
- Heating degree days
- 820
- Cooling degree days
- 0
North Haven in April
Highs average 58°14° and lows 39°4°, with 4.2 in106 mm of precipitation in a typical April.
- Record high
- 88°31° (2023)
- Record low
- 17°−8° (1954)
- Heating degree days
- 494
- Cooling degree days
- 1
North Haven in May
Highs average 68°20° and lows 49°10°, with 3.5 in90 mm of precipitation in a typical May.
- Record high
- 95°35° (2022)
- Record low
- 30°−1° (2008)
- Heating degree days
- 215
- Cooling degree days
- 15
North Haven in June
Highs average 76°25° and lows 59°15°, with 3.5 in88 mm of precipitation in a typical June.
- Record high
- 98°37° (2025)
- Record low
- 40°4° (1967)
- Heating degree days
- 36
- Cooling degree days
- 121
North Haven in July
Highs average 82°28° and lows 66°19°, with 3.4 in85 mm of precipitation in a typical July.
- Record high
- 101°38° (2011)
- Record low
- 50°10° (2002)
- Heating degree days
- 2
- Cooling degree days
- 277
North Haven in August
Highs average 81°27° and lows 65°18°, with 3.6 in90 mm of precipitation in a typical August.
- Record high
- 100°38° (1948)
- Record low
- 43°6° (1976)
- Heating degree days
- 3
- Cooling degree days
- 246
North Haven in September
Highs average 75°24° and lows 57°14°, with 4 in102 mm of precipitation in a typical September.
- Record high
- 95°35° (2023)
- Record low
- 34°1° (1957)
- Heating degree days
- 63
- Cooling degree days
- 93
North Haven in OctoberThis month
Highs average 64°18° and lows 46°8°, with 3.8 in96 mm of precipitation in a typical October.
- Record high
- 89°32° (2019)
- Record low
- 23°−5° (2015)
- Heating degree days
- 331
- Cooling degree days
- 10
North Haven in November
Highs average 53°12° and lows 36°2°, with 3.1 in79 mm of precipitation in a typical November.
- Record high
- 80°27° (2022)
- Record low
- 13°−11° (2018)
- Heating degree days
- 611
- Cooling degree days
- 0
North Haven in December
Highs average 44°7° and lows 29°−2°, with 3.5 in90 mm of precipitation in a typical December.
- Record high
- 65°18° (1973)
- Record low
- −3°−19° (1948)
- Heating degree days
- 890
- Cooling degree days
- 0