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United States › Connecticut › Northeastern Connecticut Planning Region › Climate Station WILLIMANTIC WINDHAM AP, CT US Distance 12.9 mi Normals 1991–2020

30-year climate normals

Northeastern Connecticut Planning Region Climate and Weather Averages

Hottest month — July

82.8°

average daily high. The coldest month is January, averaging a low of 18.1°F.

Northeastern Connecticut Planning Region gets 43.25" of precipitation a year, and 28% of it falls in Aug, Sep, Oct.

Temperature through the year

Each bar spans the average daily low to the average daily high for that month.

20° 40° 60° 80° JanFebMarAprMayJunJulAugSepOctNovDec
MonthAvg highAvg low Precip
January 36.2° 18.1° 3.20"
February 38.8° 19.4° 2.66"
March 47.0° 27.0° 3.95"
April 59.2° 36.7° 3.97"
May 70.0° 46.9° 3.40"
June 77.9° 56.1° 3.87"
July 82.8° 61.9° 2.66"
August 81.0° 60.3° 4.37"
September 74.3° 52.4° 4.11"
October 62.8° 40.8° 3.83"
November 51.6° 31.4° 3.55"
December 41.3° 23.8° 3.68"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 28% falling in the wettest three months (Aug, Sep, Oct).

January 3.20"
February 2.66"
March 3.95"
April 3.97"
May 3.40"
June 3.87"
July 2.66"
August 4.37"
September 4.11"
October 3.83"
November 3.55"
December 3.68"
Annual total 43.25"

What this climate costs you

Degree days measure how hard a building has to work to stay comfortable. They are the reason two identical houses have very different power bills, and they are the link between the weather here and what you pay every month.

Cooling degree days How much air conditioning the climate demands 626
Heating degree days How much heating the climate demands 6,094
Approximate annual cooling cost At 27.37¢/kWh, Connecticut average $171
Approximate annual electric heating cost Lower where heating is gas rather than electric $584

These are rough planning figures from degree days and the state electricity price, not a bill estimate. House size, insulation and fuel type move them a lot. See the full cost of owning a home in Northeastern Connecticut Planning Region, where electricity is one line of eight.

Common questions

What is the weather like in Northeastern Connecticut Planning Region?

Northeastern Connecticut Planning Region averages a high of 82.8°F in July and a low of 18.1°F in January. Annual precipitation is 43.25 inches, with essentially no snow.

When is the rainy season in Northeastern Connecticut Planning Region?

The wettest stretch is Aug, Sep, Oct, which accounts for 28% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Northeastern Connecticut Planning Region?

The average daily high in July, the hottest month, is 82.8°F. That drives 626 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Northeastern Connecticut Planning Region?

Effectively no. Measurable snowfall is rare in Northeastern Connecticut Planning Region.

Sources

  • Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station WILLIMANTIC WINDHAM AP, CT US (USW00054767), 12.9 miles from the county centroid.
  • Heating and cooling degree days — NOAA, same station and period.
  • Electricity price — US Energy Information Administration, Electric Power Monthly Table 5.6.A, Connecticut residential average.
  • Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.