Climate averages 1991–2020
New Haven weather
in January.
A cold, wet month: the coolest and the 6th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
January is a cold month in New Haven: daytime highs average 2.7°C and nights cool to about -3.6°C. By daytime temperature it is the coolest month of the year.
Expect about 108 mm of rain on roughly 10 days, which makes January a wet month (the 6th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 9 h 34 min on an average January day.
The nearest other city in this atlas is Bridgeport (26 km away). In January its highs average 2.6°C, about as warm as New Haven, with 96 mm of rain.
Among the 498 cities listed in the United States, New Haven ranks joint 375th of 498 for the warmest January highs and joint 438th of 498 for the driest January (rainfall, lowest first). The mean January high of those 498 cities is 9.5°C; New Haven is 6.8°C cooler than that mean.
From January to February, average highs rise by 0.9°C to 3.6°C, and monthly rainfall falls from 108 mm to 97 mm.
The annual picture
January 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, selected | 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 | 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
January in nearby cities
- Bridgeport in JanuaryUnited States · 26 kmHigh 2.6°C · Low -3.8°C · 96 mm rain
- Waterbury in JanuaryUnited States · 30 kmHigh 2.1°C · Low -5.9°C · 88 mm rain
- New Britain in JanuaryUnited States · 41 kmHigh 2.0°C · Low -6.6°C · 84 mm precipitation
- Danbury in JanuaryUnited States · 45 kmHigh 2.0°C · Low -6.0°C · 88 mm precipitation
- Norwalk in JanuaryUnited States · 45 kmHigh 2.6°C · Low -4.1°C · 84 mm rain
- Hartford in JanuaryUnited States · 55 kmHigh 2.0°C · Low -6.9°C · 84 mm rain
- Stamford in JanuaryUnited States · 58 kmHigh 2.7°C · Low -4.2°C · 84 mm rain
- Greenburgh in JanuaryUnited States · 82 kmHigh 2.6°C · Low -4.7°C · 83 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.