West Haven, Connecticut climate: NOAA's gridded normals for the city, beside the nearest station records
NOAA's gridded 1991-2020 normals put West Haven's center at January lows of 23°F and July highs of 84°F, a yearly mean of 52.7°F and 48.1 inches of precipitation. No NOAA station keeps a record under the city's name. The nearest station record, New Haven (4 miles E, 3 ft), has January lows of 23°F and July highs of 82°F.
55,379 people (Census Bureau 2024). Distances and directions are from the city's center.
- Jan 39° 23°
- Feb 41° 24°
- Mar 48° 31°
- Apr 59° 40°
- May 69° 50°
- Jun 78° 60°
- Jul 84° 66°
- Aug 82° 65°
- Sep 75° 58°
- Oct 64° 47°
- Nov 53° 37°
- Dec 44° 29°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
The months above are NOAA's gridded normals at West Haven's center.
What is each month like in West Haven?
NOAA's grid estimates the normals every 5 km or so from the stations around each point, terrain included. It smooths between stations, so night lows at the heart of a large city can run warmer than the grid shows: at five big-city airports we compared, the grid's highs were within about 1°F of the station and its lows 1-6°F cooler. The nearest record's high and low are beside each month.
| Month | High | Low | Mean | Precip. | New Haven high | New Haven low |
|---|---|---|---|---|---|---|
| January | 39°F | 23°F | 31.0°F | 3.52 | 38°F | 23°F |
| February | 41°F | 24°F | 32.3°F | 3.17 | 40°F | 24°F |
| March | 48°F | 31°F | 39.5°F | 4.25 | 47°F | 30°F |
| April | 59°F | 40°F | 49.7°F | 4.42 | 58°F | 39°F |
| May | 69°F | 50°F | 59.6°F | 3.90 | 68°F | 49°F |
| June | 78°F | 60°F | 69.0°F | 4.28 | 76°F | 59°F |
| July | 84°F | 66°F | 75.3°F | 3.82 | 82°F | 66°F |
| August | 82°F | 65°F | 73.5°F | 3.67 | 81°F | 65°F |
| September | 75°F | 58°F | 66.4°F | 4.42 | 75°F | 57°F |
| October | 64°F | 47°F | 55.3°F | 4.61 | 64°F | 46°F |
| November | 53°F | 37°F | 44.9°F | 3.79 | 53°F | 36°F |
| December | 44°F | 29°F | 36.3°F | 4.31 | 44°F | 29°F |
In metric: a yearly mean of 11.5°C, January lows of −5°C, July highs of 29°C and 1,223 mm of precipitation a year.
Source: NOAA NCEI U.S. Monthly Gridded Climate Normals 1991-2020 (nClimGrid, accession 0245564); NOAA NCEI 1991-2020 station normals. The grid cell holding the city's Census center point.
What do the station records around West Haven say?
Each row is a NOAA station's own 1991-2020 normals, with the snow and frost dates the grid does not give. A record downhill or nearer the coast than the city can run warmer, one uphill cooler: compare the elevations.
| Record | Where | Elevation | Year | Jan low | Jul high | Precip. | Snow | Last frost |
|---|---|---|---|---|---|---|---|---|
| New HavenNew Haven Tweed Airport | 4 mi E | 3 ft | 52.0°F | 23°F | 82°F | 41.8 | – | April 17 |
| Ansonia1 mi NE | 8 mi NW | 136 ft | 50.1°F | 18°F | 82°F | 52.0 | – | April 25 |
| Mount Carmel | 10 mi N | 180 ft | 51.7°F | 20°F | 85°F | 50.4 | – | April 18 |
Source: NOAA NCEI 1991-2020 U.S. Climate Normals; place center and population: Census Bureau 2024. Last frost: the median last spring date of 32°F.
How much snow, how late a frost, what zone and how much sun in West Haven?
NOAA's grid gives no snow, frost dates or records, so these come from the nearest station record, New Haven (4 miles E, 3 ft). NOAA publishes no snowfall normal for it; the nearest record that has one, Bridgeport (11 miles away), gets 34 inches a year. The last spring frost (32°F) comes after April 17 in half of years and the first autumn frost before October 27. Its record high is 101°F (2011) and its record low −8°F (1948) (kept since 1948).
The USDA's 2023 Plant Hardiness Zone Map puts West Haven in zone 7a (ZIP code 06516).
Over a year 73% of the sunlight that would reach the ground under clear skies gets through the clouds in the area (3.9 kWh per square metre a day, NASA POWER 2001-2020); July is the sunniest month (79%) and December the cloudiest (67%).
New Haven's page has its months, frost probabilities, records by month and recent years. NOAA's grid has monthly figures only, so there are no day-by-day month pages for West Haven; the nearest record's month pages have them.
Source: NOAA NCEI 1991-2020 normals, station USW00014758; records: ACIS; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; sunshine: NASA POWER.
How does the climate vary across West Haven, ZIP code by ZIP code?
One ZIP code area lies wholly or partly in West Haven. Each row also names the nearest station record and its frost dates.
Source: Census Bureau 2020 ZCTA-to-place relationship file and ZCTA centers; NOAA NCEI gridded and station normals, 1991-2020. A ZIP area counts when at least a tenth of its land (and 0.5 km²) is in the city; its figures are the grid cell at its center; frost dates are the nearest record's medians of 32°F.