This weather has a price Keeping the median Penobscot County home comfortable runs roughly $1,038 a year in heating and cooling alone. See where it lands in the monthly bill

30-year climate normals

Penobscot County Climate and Weather Averages

Hottest month: July

79.3°

average daily high. The coldest month is January, averaging a low of 3.4°F.

Penobscot County gets 44.27" 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	25.6°	3.4°	3.46"
February	29.1°	4.8°	2.38"
March	38.2°	17.0°	3.52"
April	51.7°	30.4°	3.58"
May	65.5°	43.0°	3.72"
June	74.0°	52.5°	4.07"
July	79.3°	58.8°	3.37"
August	77.7°	56.5°	3.61"
September	69.5°	47.6°	3.43"
October	56.5°	36.7°	4.73"
November	43.5°	27.2°	4.17"
December	31.5°	14.8°	4.23"

Rainfall by month

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

January 3.46"

February 2.38"

March 3.52"

April 3.58"

May 3.72"

June 4.07"

July 3.37"

August 3.61"

September 3.43"

October 4.73"

November 4.17"

December 4.23"

Annual total 44.27"

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 337

Heating degree days How much heating the climate demands 8,272

Approximate annual cooling cost At 32.11¢/kWh, Maine average $108

Approximate annual electric heating cost Lower where heating is gas rather than electric $930

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 Penobscot County, where electricity is one line of eight.

Common questions

What is the weather like in Penobscot County?

Penobscot County averages a high of 79.3°F in July and a low of 3.4°F in January. Annual precipitation is 44.27 inches, with essentially no snow.

When is the rainy season in Penobscot 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 Penobscot County?

The average daily high in July, the hottest month, is 79.3°F. That drives 337 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Penobscot County?

The weather station used for Penobscot County, LINCOLN SANITARY DISTRICT/WTP, ME 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 44.27 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 LINCOLN SANITARY DISTRICT/WTP, ME US (USC00174683), 8 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, Maine residential average.
Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.