Connecticut has an average annual temperature of
51.1°F
(across all 18 cities) with approximately
1191 mm of annual precipitation
and average humidity of 80%.
The warmest city is Danbury
with average July highs of 92.7°F,
while East Hartford
is the coldest with average January lows of -3.3°F.
This page covers 45 years of NASA POWER climate data (1981–2025)
including temperature, rainfall, humidity, wind speed, and solar radiation.
Jul is typically the warmest month across Connecticut with average highs around
90.9°F, while
Jan is the coldest with average lows near
2.8°F.
Oct is the wettest month with approximately
109 mm of rainfall on average.
This chart shows how Connecticut's average temperatures have shifted across 45 years.
Use the range buttons to focus on recent decades or view the full historical record.
Data is averaged across all 18 cities in the state.
🌧️ Annual Precipitation Trend
State-wide avg annual precipitation · Last 10 years · mm/year
🔗 Explore Cities in Connecticut
Browse detailed weather history, monthly averages, and 45-year climate trends for every city in Connecticut.
East Hartford is the wettest city in Connecticut with approximately 1199 mm of annual precipitation on average. View East Hartford weather history →
What is the warmest month in Connecticut?▼
Jul is the warmest month across Connecticut, with state-wide average highs of 90.9°F and average lows of 55.8°F.
How many cities in Connecticut have weather data?▼
TownPillar has historical weather data for 18 cities in Connecticut, covering 45 years of NASA POWER climate records from 1981 to 2025.
Which month has the most sunshine in Connecticut?▼
Jul is the sunniest month across Connecticut with an average solar radiation of 5.90 kWh/m²/day state-wide. This solar radiation data from NASA POWER is useful for solar energy planning, agriculture, and understanding seasonal sunshine availability.
Where does this climate data come from?▼
All data is sourced from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis data. It includes monthly temperature, precipitation, humidity, wind speed, and solar radiation at 0.5° × 0.625° spatial resolution.
📚 Data Source
All weather data is sourced from NASA POWER (Prediction of Worldwide Energy Resources). Data covers 45 years (1981–2025) across 18 cities in Connecticut at monthly temporal resolution.