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United States › Massachusetts › Nantucket County › Climate Station NANTUCKET MEM AP, MA US Distance 3.5 mi Normals 1991–2020

30-year climate normals

Nantucket County Climate and Weather Averages

Hottest month — August

75.7°

average daily high. The coldest month is January, averaging a low of 26.6°F.

Nantucket County gets 40.86" of precipitation a year, and 30% 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° JanFebMarAprMayJunJulAugSepOctNovDec
MonthAvg highAvg low Precip
January 39.5° 26.6° 3.18"
February 40.1° 27.0° 2.84"
March 44.2° 31.5° 3.84"
April 52.2° 38.8° 3.60"
May 60.7° 47.0° 2.98"
June 68.7° 55.7° 3.00"
July 75.4° 62.6° 2.72"
August 75.7° 62.4° 3.00"
September 70.4° 57.0° 3.59"
October 61.9° 48.6° 4.39"
November 52.8° 40.0° 3.79"
December 45.1° 32.2° 3.93"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 30% falling in the wettest three months (Oct, Nov, Dec).

January 3.18"
February 2.84"
March 3.84"
April 3.60"
May 2.98"
June 3.00"
July 2.72"
August 3.00"
September 3.59"
October 4.39"
November 3.79"
December 3.93"
Annual total 40.86"

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 343
Heating degree days How much heating the climate demands 5,536
Approximate annual cooling cost At 28.82¢/kWh, Massachusetts average $99
Approximate annual electric heating cost Lower where heating is gas rather than electric $558

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 Nantucket County, where electricity is one line of eight.

Common questions

What is the weather like in Nantucket County?

Nantucket County averages a high of 75.7°F in August and a low of 26.6°F in January. Annual precipitation is 40.86 inches, with essentially no snow.

When is the rainy season in Nantucket County?

The wettest stretch is Oct, Nov, Dec, which accounts for 30% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Nantucket County?

The average daily high in August, the hottest month, is 75.7°F. That drives 343 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Nantucket County?

Effectively no. Measurable snowfall is rare in Nantucket County.

Sources

  • Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station NANTUCKET MEM AP, MA US (USW00014756), 3.5 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.