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United States › Massachusetts › Suffolk County › Climate Station BOSTON LOGAN INTL AP, MA US Distance 1.6 mi Normals 1991–2020

30-year climate normals

Suffolk County Climate and Weather Averages

Hottest month — July

82.1°

average daily high. The coldest month is January, averaging a low of 23.1°F.

Suffolk County gets 43.59" of precipitation a year and 49.2" of snow, 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.

40° 60° 80° JanFebMarAprMayJunJulAugSepOctNovDec
MonthAvg highAvg low PrecipSnow
January 36.8° 23.1° 3.39" 14.3"
February 39.0° 24.6° 3.21" 14.4"
March 45.5° 31.1° 4.17" 9.0"
April 56.4° 40.8° 3.63" 1.6"
May 66.5° 50.3° 3.25" 0.0"
June 76.2° 59.7° 3.89" 0.0"
July 82.1° 66.0° 3.27" 0.0"
August 80.4° 65.1° 3.23" 0.0"
September 73.1° 58.2° 3.56" 0.0"
October 62.1° 47.5° 4.03" 0.2"
November 51.6° 37.9° 3.66" 0.7"
December 42.2° 29.2° 4.30" 9.0"

Rainfall by month

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

January 3.39"
February 3.21"
March 4.17"
April 3.63"
May 3.25"
June 3.89"
July 3.27"
August 3.23"
September 3.56"
October 4.03"
November 3.66"
December 4.30"
Annual total 43.59"

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 802
Heating degree days How much heating the climate demands 5,546
Approximate annual cooling cost At 28.82¢/kWh, Massachusetts average $231
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 Suffolk County, where electricity is one line of eight.

Common questions

What is the weather like in Suffolk County?

Suffolk County averages a high of 82.1°F in July and a low of 23.1°F in January. Annual precipitation is 43.59 inches, including 49.2 inches of snow.

When is the rainy season in Suffolk 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 Suffolk County?

The average daily high in July, the hottest month, is 82.1°F. That drives 802 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Suffolk County?

Yes. Suffolk County averages 49.2 inches of snow a year.

Sources

  • Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station BOSTON LOGAN INTL AP, MA US (USW00014739), 1.6 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.