30-year climate normals

South Central Connecticut Planning Region Climate and Weather Averages

Hottest month — July

82.1°

average daily high. The coldest month is January, averaging a low of 23.0°F.

South Central Connecticut Planning Region gets 41.79" of precipitation a year, and 27% of it falls in Mar, Apr, May.

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	38.1°	23.0°	2.72"
February	40.2°	23.9°	2.84"
March	47.0°	30.1°	3.66"
April	57.8°	39.3°	4.19"
May	67.7°	49.4°	3.54"
June	76.4°	59.3°	3.47"
July	82.1°	65.7°	3.36"
August	81.0°	64.7°	3.55"
September	74.7°	57.3°	4.03"
October	63.8°	45.5°	3.78"
November	53.4°	35.9°	3.12"
December	43.7°	28.9°	3.53"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 27% falling in the wettest three months (Mar, Apr, May).

January 2.72"

February 2.84"

March 3.66"

April 4.19"

May 3.54"

June 3.47"

July 3.36"

August 3.55"

September 4.03"

October 3.78"

November 3.12"

December 3.53"

Annual total 41.79"

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 765

Heating degree days How much heating the climate demands 5,455

Approximate annual cooling cost At 27.37¢/kWh, Connecticut average $209

Approximate annual electric heating cost Lower where heating is gas rather than electric $523

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

Common questions

What is the weather like in South Central Connecticut Planning Region?

South Central Connecticut Planning Region averages a high of 82.1°F in July and a low of 23.0°F in January. Annual precipitation is 41.79 inches, with essentially no snow.

When is the rainy season in South Central Connecticut Planning Region?

The wettest stretch is Mar, Apr, May, which accounts for 27% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in South Central Connecticut Planning Region?

The average daily high in July, the hottest month, is 82.1°F. That drives 765 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in South Central Connecticut Planning Region?

Effectively no. Measurable snowfall is rare in South Central Connecticut Planning Region.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station NEW HAVEN TWEED AP, CT US (USW00014758), 3.2 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.