30-year climate normals

Roosevelt County Climate and Weather Averages

Hottest month — July

83.6°

average daily high. The coldest month is January, averaging a low of -0.1°F.

Roosevelt County gets 14.19" of precipitation a year, and 54% 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	23.4°	-0.1°	0.43"
February	27.7°	4.6°	0.30"
March	40.4°	16.1°	0.59"
April	55.8°	27.4°	1.03"
May	66.9°	37.9°	2.19"
June	75.7°	47.5°	2.94"
July	83.6°	52.9°	2.57"
August	83.6°	51.0°	1.38"
September	72.5°	40.1°	1.07"
October	56.1°	27.2°	0.87"
November	39.1°	13.9°	0.43"
December	26.8°	2.9°	0.39"

Rainfall by month

Roosevelt County has a distinct wet season. 54% of the year's precipitation arrives in May, Jun, Jul.

January 0.43"

February 0.30"

March 0.59"

April 1.03"

May 2.19"

June 2.94"

July 2.57"

August 1.38"

September 1.07"

October 0.87"

November 0.43"

December 0.39"

Annual total 14.19"

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 332

Heating degree days How much heating the climate demands 9,210

Approximate annual cooling cost At 14.67¢/kWh, Montana average $49

Approximate annual electric heating cost Lower where heating is gas rather than electric $473

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 Roosevelt County, where electricity is one line of eight.

Common questions

What is the weather like in Roosevelt County?

Roosevelt County averages a high of 83.6°F in July and a low of -0.1°F in January. Annual precipitation is 14.19 inches, with essentially no snow.

When is the rainy season in Roosevelt County?

The wettest stretch is May, Jun, Jul, which accounts for 54% 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 Roosevelt County?

The average daily high in July, the hottest month, is 83.6°F. That drives 332 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Roosevelt County?

Effectively no. Measurable snowfall is rare in Roosevelt County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station WOLF POINT 29 ENE, MT US (USW00094060), 5.2 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.