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United States › Massachusetts › Barnstable County › Climate Station HYANNIS BARNSTABLE MUNI AP, MA US Distance 6.5 mi Normals 1991–2020

30-year climate normals

Barnstable County Climate and Weather Averages

Hottest month — July

80.8°

average daily high. The coldest month is January, averaging a low of 24.1°F.

Barnstable County gets 44.7" of precipitation a year, and 29% 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 Precip
January 39.9° 24.1° 3.90"
February 41.0° 24.8° 3.17"
March 45.9° 30.3° 4.25"
April 55.2° 38.5° 3.90"
May 65.0° 48.0° 3.42"
June 73.9° 57.5° 3.14"
July 80.8° 64.8° 2.68"
August 79.7° 63.4° 3.25"
September 73.1° 55.8° 3.85"
October 63.4° 45.7° 4.33"
November 53.5° 37.3° 4.13"
December 45.2° 29.3° 4.68"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 29% falling in the wettest three months (Oct, Nov, Dec).

January 3.90"
February 3.17"
March 4.25"
April 3.90"
May 3.42"
June 3.14"
July 2.68"
August 3.25"
September 3.85"
October 4.33"
November 4.13"
December 4.68"
Annual total 44.7"

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 632
Heating degree days How much heating the climate demands 5,518
Approximate annual cooling cost At 28.82¢/kWh, Massachusetts average $182
Approximate annual electric heating cost Lower where heating is gas rather than electric $557

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 Barnstable County, where electricity is one line of eight.

Common questions

What is the weather like in Barnstable County?

Barnstable County averages a high of 80.8°F in July and a low of 24.1°F in January. Annual precipitation is 44.7 inches, with essentially no snow.

When is the rainy season in Barnstable County?

The wettest stretch is Oct, Nov, Dec, which accounts for 29% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Barnstable County?

The average daily high in July, the hottest month, is 80.8°F. That drives 632 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Barnstable County?

Effectively no. Measurable snowfall is rare in Barnstable County.

Sources

  • Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station HYANNIS BARNSTABLE MUNI AP, MA US (USW00094720), 6.5 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.