30-year climate normals

Sheridan County Climate and Weather Averages

Hottest month — August

82.3°

average daily high. The coldest month is January, averaging a low of -1.8°F.

Sheridan County gets 14.69" of precipitation a year, and 52% 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	20.6°	-1.8°	0.39"
February	25.8°	2.7°	0.35"
March	38.9°	14.7°	0.60"
April	54.3°	26.5°	1.02"
May	66.5°	37.5°	2.04"
June	74.8°	47.8°	3.07"
July	82.0°	52.4°	2.54"
August	82.3°	50.6°	1.46"
September	71.5°	39.9°	1.26"
October	54.7°	27.3°	0.88"
November	36.9°	14.4°	0.61"
December	23.7°	2.7°	0.47"

Rainfall by month

Sheridan County has a distinct wet season. 52% of the year's precipitation arrives in May, Jun, Jul.

January 0.39"

February 0.35"

March 0.60"

April 1.02"

May 2.04"

June 3.07"

July 2.54"

August 1.46"

September 1.26"

October 0.88"

November 0.61"

December 0.47"

Annual total 14.69"

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 296

Heating degree days How much heating the climate demands 9,573

Approximate annual cooling cost At 14.67¢/kWh, Montana average $43

Approximate annual electric heating cost Lower where heating is gas rather than electric $492

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 Sheridan County, where electricity is one line of eight.

Common questions

What is the weather like in Sheridan County?

Sheridan County averages a high of 82.3°F in August and a low of -1.8°F in January. Annual precipitation is 14.69 inches, with essentially no snow.

When is the rainy season in Sheridan County?

The wettest stretch is May, Jun, Jul, which accounts for 52% 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 Sheridan County?

The average daily high in August, the hottest month, is 82.3°F. That drives 296 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Sheridan County?

Effectively no. Measurable snowfall is rare in Sheridan County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station PLENTYWOOD, MT US (USC00246586), 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, Montana residential average.
Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.