Photo: Paperchaser29 · CC BY-SA 3.0North Haven gets more rain and snow than 73% of U.S. towns: 48 inches of precipitation a year
The coldest hours of a January night bottom out at 20° on average. December has warmed most since 1901–2000, part of a 1.8° rise. Plan time outside from May to June and August to October, when highs sit at 64–82°.
A year in North Haven at a glance
Each month’s typical high and low, and what it brings.
What stands out about North Haven’s climate
Compared with towns across the U.S., with North Haven’s place in Connecticut beside it.
What a year in North Haven feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 191 frost-free days a year
In half of years the last 32° night comes by April 18 and the first by October 26. Frost and day counts come from NOAA’s station at Mt Carmel, CT, 3 miles from the town’s center, 110 ft higher.
The 2023 USDA map puts North Haven’s center in zone 7a: the coldest night of a typical winter, averaged over 1991–2020, reaches about 0°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
About 34 inches of snow a winter
Snow, measured at Bridgeport Sikorsky Mem Airport, falls mostly in February. Precipitation (rain plus melted snow) adds up to 48 inches a year; October is the wettest month and February the driest. Rain or snow falls on about 125 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in North Haven
87% of the work is heating, so the furnace matters far more than the air conditioner. Months averaging under 55° run from October through April.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Mt Carmel, CT.
Living with North Haven’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
191 frost-free days in zone 7a. The last frost comes by Apr 18 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Oct 26.
Months with highs of 62–84° and lows of 40° or more: May, June, August, September and October. 29 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in North Haven from natural hazards, river flooding is the largest share (62%); heat waves, cold waves, winter storms and ice storms together are 4%. Normals are averages; the hazards page covers the extremes.
Natural hazards →North Haven and its neighbors
Every town next door is within a degree of North Haven in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like North Haven’s, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| North Haven, CT | 20° | 84° | 48" | 34" |
| Manchester, MD | 22° | 84° | 47" | 34" |
| New Freedom, PA | 21° | 84° | 48" | 29" |
| Cumberland, IN | 20° | 85° | 44" | 27" |
| New Martinsville, WV | 22° | 85° | 46" | 27" |
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value. Snow and frost-free days come from the nearest weather station, so neighbors often share them.
Warmer than it used to be
The last 30 years in North Haven averaged 1.8° warmer than the 1900s. The biggest change is in December (+3.4°).
A bigger shift than in 82% of U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods.
How North Haven compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with North Haven’s place among Connecticut’s.
North Haven weather by month
Highs, lows and precipitation from NOAA’s grid at North Haven’s center; snow, wet days and snow on the ground from Bridgeport Sikorsky Mem Airport. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 37° | 20° | 3.5" | 8.5" | 11 | 11 | 20° – 35° |
| February | 40° | 21° | 3.2" | 10.7" | 10 | 12 | 17° – 37° |
| March | 48° | 28° | 4.1" | 7.0" | 11 | 6 | 32° – 46° |
| April | 60° | 38° | 4.3" | 0.9" | 11 | 0 | 44° – 53° |
| May | 70° | 48° | 3.7" | 0.0" | 12 | 0 | 54° – 64° |
| June | 79° | 57° | 4.3" | 0.0" | 11 | 0 | 65° – 70° |
| July | 84° | 64° | 3.9" | 0.0" | 9 | 0 | 69° – 78° |
| August | 82° | 62° | 3.8" | 0.0" | 9 | 0 | 68° – 77° |
| September | 75° | 55° | 4.2" | 0.0" | 8 | 0 | 62° – 70° |
| October | 64° | 43° | 4.6" | 0.1" | 10 | 0 | 50° – 60° |
| November | 52° | 33° | 3.8" | 0.9" | 9 | 0 | 38° – 47° |
| December | 42° | 26° | 4.2" | 5.5" | 12 | 5 | 27° – 45° |
| Year | 61° | 41° | 47.6" | 33.6" | 125 | 34 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 17° to 37°. June is the most reliable, staying within 6°.
Where North Haven’s numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at North Haven’s center.
- Snow: Bridgeport Sikorsky Mem Airport.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Mt Carmel, CT, 3 miles from the town’s center, 110 ft higher; the nearest station that passes our checks for distance, height and agreement with the grid.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about North Haven’s climate
What is the weather like in North Haven?
A typical July afternoon reaches 84°, a January night drops to 20°, and about 34 inches of snow falls in a normal winter. Colder January nights than 60% of U.S. towns; cooler July afternoons than 57% of U.S. towns.
How cold does it get in North Haven in winter?
January nights average 20°. About 123 nights a year reach 32° or below and 3 reach 0° or below. In the coldest January of the last 30 years the month averaged 20°.
How much snow does North Haven get?
About 34 inches in a normal winter at Bridgeport Sikorsky Mem Airport, most of it in February, with snow on the ground about 34 days a year.
How hot does it get in North Haven?
July, with a typical high of 84° and a low of 64°. About 14 days a year reach 90° (Mt Carmel, CT).
When is the first and last frost in North Haven?
In half of years the last spring frost (32°) comes by April 18 and the first fall frost by October 26, about 191 frost-free days, at Mt Carmel, CT.
What growing zone is North Haven in?
Zone 7a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 0°.
What is the best time of year to visit North Haven?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June, August, September and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is North Haven getting warmer?
Yes: 1991–2020 averaged 1.8° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 82% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in North Haven.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.