30-year climate normals

Norfolk County Climate and Weather Averages

Hottest month — July

85.7°

average daily high. The coldest month is January, averaging a low of 20.6°F.

Norfolk County gets 43.91" of precipitation a year, and 28% of it falls in Oct, Nov, Dec.

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	39.5°	20.6°	3.41"
February	42.3°	21.6°	2.80"
March	48.9°	29.5°	3.72"
April	61.2°	39.0°	3.96"
May	71.3°	47.9°	3.30"
June	80.4°	57.3°	3.92"
July	85.7°	62.8°	3.03"
August	84.3°	60.6°	3.63"
September	76.8°	52.1°	3.82"
October	65.7°	41.2°	4.54"
November	54.6°	33.6°	3.69"
December	44.3°	26.3°	4.09"

Rainfall by month

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

January 3.41"

February 2.80"

March 3.72"

April 3.96"

May 3.30"

June 3.92"

July 3.03"

August 3.63"

September 3.82"

October 4.54"

November 3.69"

December 4.09"

Annual total 43.91"

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 828

Heating degree days How much heating the climate demands 5,540

Approximate annual cooling cost At 28.82¢/kWh, Massachusetts average $239

Approximate annual electric heating cost Lower where heating is gas rather than electric $559

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 Norfolk County, where electricity is one line of eight.

Common questions

What is the weather like in Norfolk County?

Norfolk County averages a high of 85.7°F in July and a low of 20.6°F in January. Annual precipitation is 43.91 inches, with essentially no snow.

When is the rainy season in Norfolk County?

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

How hot does it get in Norfolk County?

The average daily high in July, the hottest month, is 85.7°F. That drives 828 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Norfolk County?

Effectively no. Measurable snowfall is rare in Norfolk County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station NORWOOD MEM AP, MA US (USW00054704), 1.4 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, Massachusetts residential average.
Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.