This weather has a price Keeping the median Nantucket County home comfortable runs roughly $695 a year in heating and cooling alone. See where it lands in the monthly bill

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.

Month	Avg high	Avg 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 30.48¢/kWh, Massachusetts average $105

Approximate annual electric heating cost Lower where heating is gas rather than electric $591

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?

The weather station used for Nantucket County, NANTUCKET MEM AP, MA US, reports temperature and precipitation but not snowfall, so there is no snow normal to quote here. Precipitation that falls as snow is still counted in the 40.86 inches above, measured as melted water.

Sources

Temperature, precipitation and snowfall normals: NOAA National Centers for Environmental Information, 1991 to 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.
Annual figures on this page are the sum of that station's twelve monthly normals. NOAA also publishes a separately-computed annual normal, which can differ from the monthly sum by a few percent; we use the monthly series because the month-by-month breakdown above has to come from it.
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.