Climate averages 1991–2020
New Haven weather
in May.
A mild, wet month: the 5th warmest and the joint 3rd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a mild month in New Haven: daytime highs average 18.4°C and nights cool to about 10.6°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 98 mm of rain on roughly 12 days, which makes May a wet month (the joint 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 29 min on an average May day.
The nearest other city in this atlas is Bridgeport (26 km away). In May its highs average 19.0°C, 0.6°C warmer than New Haven, with 92 mm of rain.
Among the 498 cities listed in the United States, New Haven ranks joint 466th of 498 for the warmest May highs and joint 356th of 498 for the driest May (rainfall, lowest first). The mean May high of those 498 cities is 23.8°C; New Haven is 5.4°C cooler than that mean.
From May to June, average highs rise by 5.2°C to 23.6°C, and monthly rainfall stays at 98 mm.
The annual picture
May in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
New Haven climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 2.7°C-3.6°C | -3.6°C | 108 | 10.1 | 9.610 h |
| February | 3.6°C-3.3°C | -3.3°C | 97 | 9.2 | 10.611 h |
| March | 7.3°C0.0°C | 0.0°C | 128 | 10.9 | 11.912 h |
| April | 13.1°C5.2°C | 5.2°C | 116 | 11.5 | 13.313 h |
| May, selected | 18.4°C10.6°C | 10.6°C | 98 | 11.6 | 14.514 h |
| June | 23.6°C16.2°C | 16.2°C | 98 | 10.5 | 15.115 h |
| July | 27.0°C19.9°C | 19.9°C | 82 | 9.5 | 14.815 h |
| August | 26.3°C19.6°C | 19.6°C | 102 | 9.6 | 13.814 h |
| September | 22.6°C16.2°C | 16.2°C | 109 | 8.9 | 12.513 h |
| October | 16.5°C10.5°C | 10.5°C | 129 | 10.1 | 11.111 h |
| November | 10.7°C4.9°C | 4.9°C | 110 | 9.5 | 9.910 h |
| December | 5.6°C0.0°C | 0.0°C | 137 | 11.2 | 9.39 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
May in nearby cities
- Bridgeport in MayUnited States · 26 kmHigh 19.0°C · Low 10.9°C · 92 mm rain
- Waterbury in MayUnited States · 30 kmHigh 20.0°C · Low 10.3°C · 87 mm rain
- New Britain in MayUnited States · 41 kmHigh 20.2°C · Low 9.8°C · 84 mm rain
- Danbury in MayUnited States · 45 kmHigh 19.9°C · Low 10.2°C · 99 mm rain
- Norwalk in MayUnited States · 45 kmHigh 19.5°C · Low 11.2°C · 85 mm rain
- Hartford in MayUnited States · 55 kmHigh 20.4°C · Low 9.7°C · 84 mm rain
- Stamford in MayUnited States · 58 kmHigh 19.8°C · Low 11.3°C · 85 mm rain
- Greenburgh in MayUnited States · 82 kmHigh 20.2°C · Low 11.2°C · 87 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for New Haven) is explained once on the New Haven year overview and on the Sources, method and limits page.