30-year climate normals

Powell County Climate and Weather Averages

Hottest month — July

80.4°

average daily high. The coldest month is December, averaging a low of 8.1°F.

Powell County gets 11.8" of precipitation a year, and 37% 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	28.9°	8.2°	0.73"
February	32.4°	9.0°	0.38"
March	43.6°	18.8°	0.51"
April	52.7°	24.4°	0.77"
May	62.8°	32.0°	1.48"
June	69.4°	39.3°	2.04"
July	80.4°	42.2°	0.90"
August	79.9°	40.1°	0.91"
September	69.4°	32.7°	1.03"
October	53.9°	23.5°	1.00"
November	38.2°	16.0°	1.12"
December	28.3°	8.1°	0.93"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 37% falling in the wettest three months (May, Jun, Jul).

January 0.73"

February 0.38"

March 0.51"

April 0.77"

May 1.48"

June 2.04"

July 0.90"

August 0.91"

September 1.03"

October 1.00"

November 1.12"

December 0.93"

Annual total 11.8"

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 43

Heating degree days How much heating the climate demands 9,521

Approximate annual cooling cost At 14.67¢/kWh, Montana average $6

Approximate annual electric heating cost Lower where heating is gas rather than electric $489

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 Powell County, where electricity is one line of eight.

Common questions

What is the weather like in Powell County?

Powell County averages a high of 80.4°F in July and a low of 8.1°F in December. Annual precipitation is 11.8 inches, with essentially no snow.

When is the rainy season in Powell County?

The wettest stretch is May, Jun, Jul, which accounts for 37% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Powell County?

The average daily high in July, the hottest month, is 80.4°F. That drives 43 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Powell County?

Effectively no. Measurable snowfall is rare in Powell County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station OVANDO 9 SSE, MT US (USC00246304), 6.5 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.