This weather has a price Keeping the median Ravalli County home comfortable runs roughly $441 a year in heating and cooling alone. See where it lands in the monthly bill

30-year climate normals

Ravalli County Climate and Weather Averages

Hottest month: July

81.8°

average daily high. The coldest month is January, averaging a low of 19.2°F.

Ravalli County gets 15.11" of precipitation a year, and 32% 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	33.9°	19.2°	1.08"
February	38.1°	21.0°	0.87"
March	47.2°	27.1°	0.85"
April	53.7°	31.3°	1.04"
May	64.0°	39.0°	1.60"
June	71.6°	44.5°	2.09"
July	81.8°	49.6°	1.14"
August	80.6°	47.6°	0.90"
September	71.4°	41.5°	1.23"
October	57.0°	32.6°	1.50"
November	41.6°	24.8°	1.55"
December	32.2°	19.2°	1.26"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 32% falling in the wettest three months (May, Jun, Jul).

January 1.08"

February 0.87"

March 0.85"

April 1.04"

May 1.60"

June 2.09"

July 1.14"

August 0.90"

September 1.23"

October 1.50"

November 1.55"

December 1.26"

Annual total 15.11"

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 178

Heating degree days How much heating the climate demands 7,589

Approximate annual cooling cost At 15.57¢/kWh, Montana average $28

Approximate annual electric heating cost Lower where heating is gas rather than electric $414

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 Ravalli County, where electricity is one line of eight.

Common questions

What is the weather like in Ravalli County?

Ravalli County averages a high of 81.8°F in July and a low of 19.2°F in January. Annual precipitation is 15.11 inches, with essentially no snow.

When is the rainy season in Ravalli County?

The wettest stretch is May, Jun, Jul, which accounts for 32% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Ravalli County?

The average daily high in July, the hottest month, is 81.8°F. That drives 178 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Ravalli County?

The weather station used for Ravalli County, DARBY, MT US, reports temperature and precipitation but not snowfall, so there is no snow normal to quote here. Precipitation that falls as snow is still counted in the 15.11 inches above, measured as melted water.

Sources

Temperature, precipitation and snowfall normals: NOAA National Centers for Environmental Information, 1991 to 2020 Monthly Climate Normals, station DARBY, MT US (USC00242221), 4.9 miles from the county centroid.
Heating and cooling degree days: NOAA, same station and period.
Annual figures on this page are the sum of that station's twelve monthly normals. NOAA also publishes a separately-computed annual normal, which can differ from the monthly sum by a few percent; we use the monthly series because the month-by-month breakdown above has to come from it.
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.