30-year climate normals

Foster County Climate and Weather Averages

Hottest month — July

81.7°

average daily high. The coldest month is January, averaging a low of -1.5°F.

Foster County gets 20.77" of precipitation a year, and 49% of it falls in May, Jun, Jul.

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	18.3°	-1.5°	0.53"
February	23.1°	2.1°	0.42"
March	35.8°	15.3°	0.75"
April	53.2°	28.7°	1.25"
May	67.2°	41.9°	2.76"
June	76.4°	53.3°	3.78"
July	81.7°	57.3°	3.60"
August	80.7°	54.4°	2.33"
September	71.8°	45.3°	1.97"
October	55.2°	31.9°	1.90"
November	37.1°	17.9°	0.67"
December	22.8°	5.0°	0.81"

Rainfall by month

Foster County has a distinct wet season. 49% of the year's precipitation arrives in May, Jun, Jul.

January 0.53"

February 0.42"

March 0.75"

April 1.25"

May 2.76"

June 3.78"

July 3.60"

August 2.33"

September 1.97"

October 1.90"

November 0.67"

December 0.81"

Annual total 20.77"

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 419

Heating degree days How much heating the climate demands 9,262

Approximate annual cooling cost At 13.61¢/kWh, North Dakota average $57

Approximate annual electric heating cost Lower where heating is gas rather than electric $441

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 Foster County, where electricity is one line of eight.

Common questions

What is the weather like in Foster County?

Foster County averages a high of 81.7°F in July and a low of -1.5°F in January. Annual precipitation is 20.77 inches, with essentially no snow.

When is the rainy season in Foster County?

The wettest stretch is May, Jun, Jul, which accounts for 49% of the year's precipitation. That is a pronounced wet season rather than rain spread evenly through the year.

How hot does it get in Foster County?

The average daily high in July, the hottest month, is 81.7°F. That drives 419 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Foster County?

Effectively no. Measurable snowfall is rare in Foster County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station CARRINGTON 4 N, ND US (USC00321362), 11.9 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, North Dakota residential average.
Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.