Connecticut Annual Temperatures and Records


Avg High Temp

Avg Low Temp 

Avg Annual Temp

Avg # days > 90F Avg # days < 32F  Record High Temp Record Low Temp
Bridgeport 60 44 52 7 100 103 -7
Hartford 60 40 50 18 135 103 -26
  • Connecticut annual average temperature - 49.05 degrees, 29th warmest state in the U.S.
  • Record Hottest year in Connecticut - 1912 / Avg temperature 52.46 degrees
  • Record Coldest year in Connecticut - 1904 / Avg temperature 44.88 degrees
  • Connecticut average Summer temperature (June, July, August) - 69.2 F degrees, 31st warmest U.S. summer state
  • Connecticut average Winter temperature (December, January, February) - 28.5 F degrees, 21st coldest U.S. winter state

Connecticut Temperature Records

  • Hottest temperature ever recorded: 106 F, Danbury, southwestern Connecticut, 7/15/1995
  • Coldest temperature ever recorded: -32 F, Coventry, northeastern Connecticut, 1/22/1961
  • Hottest location ranked by highest average annual temperature: New Haven, southern Connecticut, 53.6 F
  • Coldest location ranked by lowest average annual temperature: Coventry, northeastern Connecticut, 46.4 F

Despite Connecticut’s small size, there is a difference of seven degrees Fahrenheit (° F) in the mean annual temperature from north to south. In the higher elevations of the northwest corner, the mean annual value is about 45 F, while along the immediate coast it is about 52° F. However, most of the State ranges from 47 to 49 in the eastern and western highlands to near 50° F in the central valley. The State’s extreme temperatures are 106 and -32° F.

The greatest contrast of temperature over the State occurs during the winter. The average minimum in January and February is 12 to 14° F in northwestern Litchfield County, as compared with an average of about 22 in coastal sections and 18 in the central valley. The average number of days with minimum temperatures of 0° F or lower is about 12 at the higher elevations, five in the lower uplands and central valley and two less along the shore of Long Island Sound. On average, about 60 to 70 days with a maximum temperature 32° F or lower can be expected in the colder regions of Connecticut, as compared to 25 to 35 days in the coastal sections and the central valley.

Summer temperatures are comparatively uniform over the State. The maximum July temperature averages 82 to 84° F, except where altitude or nearness to the ocean reduces the average by about three degrees Fahrenheit. The central valley experiences the greatest number of 90° F or hotter days. Here, temperatures at or above 90 occur an average of 18 days per year with a variation from five in a cool summer to over 30 for a hot summer. At the highest elevations, there is one such "hot" day annually, on average. The coast averages four to seven days at or above 90 per year. In much of the eastern and western highlands, the occurrence of 90 temperatures is a little less frequent than in the central valley.

Temperatures reach 100° F or higher only rarely. While most of the long-term weather observing sites across the State have recorded temperatures this high, it is only an occasional summer that 100° F or higher occurs generally over Connecticut.


Connecticut precipitation averages and extremes, precipitation and temperature data for all U.S. states and Top 10 U.S. climate extremes
Data source: National Climatic Data Center