30-year climate normals

Mercer County Climate and Weather Averages

Hottest month — August

85.9°

average daily high. The coldest month is January, averaging a low of 2.8°F.

Mercer County gets 16.88" 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	23.3°	2.8°	0.26"
February	29.2°	6.8°	0.53"
March	42.5°	18.4°	0.72"
April	58.2°	29.2°	1.61"
May	69.4°	40.8°	2.40"
June	78.0°	50.5°	3.29"
July	85.5°	55.7°	2.50"
August	85.9°	53.8°	1.85"
September	76.8°	43.7°	1.53"
October	58.9°	32.0°	1.33"
November	41.0°	17.8°	0.63"
December	27.8°	8.1°	0.23"

Rainfall by month

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

January 0.26"

February 0.53"

March 0.72"

April 1.61"

May 2.40"

June 3.29"

July 2.50"

August 1.85"

September 1.53"

October 1.33"

November 0.63"

December 0.23"

Annual total 16.88"

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 530

Heating degree days How much heating the climate demands 8,446

Approximate annual cooling cost At 13.61¢/kWh, North Dakota average $72

Approximate annual electric heating cost Lower where heating is gas rather than electric $402

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 Mercer County, where electricity is one line of eight.

Common questions

What is the weather like in Mercer County?

Mercer County averages a high of 85.9°F in August and a low of 2.8°F in January. Annual precipitation is 16.88 inches, with essentially no snow.

When is the rainy season in Mercer 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 Mercer County?

The average daily high in August, the hottest month, is 85.9°F. That drives 530 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Mercer County?

Effectively no. Measurable snowfall is rare in Mercer County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station BEULAH 1 W, ND US (USC00320766), 3.7 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.