30-year climate normals

Western Connecticut Planning Region Climate and Weather Averages

Hottest month — July

82.4°

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

Western Connecticut Planning Region gets 48.03" of precipitation a year, and 29% 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.

Month	Avg high	Avg low	Precip
January	35.9°	18.1°	3.06"
February	38.7°	19.7°	2.69"
March	46.7°	27.2°	3.89"
April	58.7°	36.6°	3.74"
May	69.1°	46.4°	3.78"
June	77.7°	56.1°	4.48"
July	82.4°	61.6°	4.46"
August	80.4°	60.0°	4.62"
September	73.6°	52.3°	4.81"
October	62.3°	40.8°	4.48"
November	51.1°	31.3°	3.78"
December	40.8°	23.9°	4.24"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 29% falling in the wettest three months (Aug, Sep, Oct).

January 3.06"

February 2.69"

March 3.89"

April 3.74"

May 3.78"

June 4.48"

July 4.46"

August 4.62"

September 4.81"

October 4.48"

November 3.78"

December 4.24"

Annual total 48.03"

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 594

Heating degree days How much heating the climate demands 6,158

Approximate annual cooling cost At 27.37¢/kWh, Connecticut average $163

Approximate annual electric heating cost Lower where heating is gas rather than electric $590

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 Western Connecticut Planning Region, where electricity is one line of eight.

Common questions

What is the weather like in Western Connecticut Planning Region?

Western Connecticut Planning Region averages a high of 82.4°F in July and a low of 18.1°F in January. Annual precipitation is 48.03 inches, with essentially no snow.

When is the rainy season in Western Connecticut Planning Region?

The wettest stretch is Aug, Sep, Oct, which accounts for 29% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Western Connecticut Planning Region?

The average daily high in July, the hottest month, is 82.4°F. That drives 594 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Western Connecticut Planning Region?

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

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station DANBURY MUNI AP, CT US (USW00054734), 6.7 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.