New Haven, Connecticut Climate by Month
New Haven, Connecticut, United States
Warm summers and cold winters, with rain spread through the year.
New Haven has warm summers and cold winters, with rain spread through the year. July is the warmest month, with highs around 85°F (30°C); January is the coolest at 38°F (4°C), and nights dip to 22°F (-6°C). It gets 47 in (1184 mm) of rain a year, spread across the months.
- Warmest month
- 85°F(30°C)
- Average high, July
- Coldest nights
- 22°F(-6°C)
- Average low, January
- Rain per year
- 47 in(1184 mm)
- No clear rainy season
- Humidity
- 68%
- Sunniest: July
Best and worst months in New Haven
Best for weatherThe most comfortable weather comes in September, with highs around 76°F (25°C) and about 3.8 in (96 mm) of rain a month.
Least pleasantJanuary is the least pleasant month: it's the coldest, with highs of only 38°F (4°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in September.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
New Haven weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 38°F(4°C) | 22°F(-6°C) | 3.4 in(87 mm) | 71% | 1.7 |
| FebFebruary | 41°F(5°C) | 23°F(-5°C) | 3.3 in(84 mm) | 65% | 2.6 |
| MarMarch | 49°F(9°C) | 31°F(-1°C) | 4.2 in(106 mm) | 60% | 3.5 |
| AprApril | 60°F(16°C) | 40°F(4°C) | 4.2 in(106 mm) | 57% | 4.6 |
| MayMay | 71°F(22°C) | 49°F(10°C) | 3.8 in(96 mm) | 62% | 5.3 |
| JunJune | 80°F(27°C) | 59°F(15°C) | 4.2 in(106 mm) | 69% | 5.6 |
| JulJuly | 85°F(30°C) | 65°F(18°C) | 3.9 in(100 mm) | 68% | 5.7 |
| AugAugust | 83°F(29°C) | 64°F(18°C) | 3.7 in(93 mm) | 71% | 5.1 |
| SepSeptemberBest | 76°F(25°C) | 56°F(13°C) | 3.8 in(96 mm) | 73% | 4.0 |
| OctOctober | 65°F(18°C) | 44°F(7°C) | 4.3 in(110 mm) | 76% | 2.8 |
| NovNovember | 54°F(12°C) | 36°F(2°C) | 3.6 in(92 mm) | 70% | 1.9 |
| DecDecember | 43°F(6°C) | 27°F(-3°C) | 4.3 in(108 mm) | 72% | 1.5 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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