Connecticut climate
World Climates covers 5 places in Connecticut. By annual mean temperature, the warmest is Bridgeport (12 °C53 °F) and the coolest is Hartford (10 °C51 °F). The wettest is Stamford with 1,236 mm49 in of precipitation per year, the driest Hartford with 1,201 mm47 in.
The most common climate types (Köppen classification computed from these averages) are hot-summer humid continental (Dfa, 4 places) and humid subtropical (Cfa, 1 place).
The highest monthly average high is in Hartford (30 °C85 °F in July); the lowest monthly average low is in Hartford (−8 °C18 °F in January).
Across the places in Connecticut, the months that most often rank as the most comfortable are May, July and September (4, 2 and 5 of 5 places respectively).
Frequently asked questions
Which is the warmest place in Connecticut?
By annual mean temperature, the warmest place in Connecticut is Bridgeport at 12 °C53 °F. The coolest is Hartford at 10 °C51 °F.
Where does it rain the most in Connecticut?
Stamford gets the most precipitation, 1,236 mm49 in in an average year. The driest place is Hartford with 1,201 mm47 in.
How many places in Connecticut does this site cover?
World Climates has climate data for 5 places in Connecticut. Each one has a page with monthly averages for temperature, rainfall, humidity and daylight.
When is the best time to visit Connecticut?
It depends on the place. Across Connecticut, the months that most often rank as the most comfortable are May, July and September. Check the page of each city for its own best months.
Climate of every place in Connecticut
| Place | Year | Max high | Min low | Precip. |
|---|---|---|---|---|
| Bridgeport | 12 | 27 | −3 | 1,206 |
| New Haven | 11 | 29 | −7 | 1,208 |
| Stamford | 11 | 29 | −6 | 1,236 |
| Hartford | 10 | 30 | −8 | 1,201 |
| Waterbury | 10 | 29 | −7 | 1,208 |
Year = annual mean temperature; max high = average high of the warmest month; min low = average low of the coldest month; precip. = annual total. Temperatures in °C°F, precipitation in mminches. Sorted by population.
Other cities over 100,000 people
These cities share a NASA POWER grid cell with a larger place, so their averages are shown on that page:
- North Stamford → data of Stamford
Data: NASA POWER climatology 2001–2025 (MERRA-2 reanalysis, CERES satellite data) — grid-cell averages, not station records. Sources and method.