30-year climate normals

Glacier County Climate and Weather Averages

Hottest month — August

73.4°

average daily high. The coldest month is February, averaging a low of 14.5°F.

Glacier County gets 26.09" of precipitation a year, and 32% of it falls in Apr, May, Jun.

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	31.6°	14.9°	2.07"
February	31.4°	14.5°	2.06"
March	37.6°	19.9°	2.50"
April	45.5°	28.0°	2.45"
May	55.8°	35.4°	2.83"
June	62.9°	41.6°	3.07"
July	73.3°	46.1°	1.20"
August	73.4°	44.5°	1.28"
September	62.7°	39.1°	1.63"
October	49.0°	31.7°	2.17"
November	37.4°	24.6°	2.70"
December	30.7°	17.0°	2.13"

Rainfall by month

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

January 2.07"

February 2.06"

March 2.50"

April 2.45"

May 2.83"

June 3.07"

July 1.20"

August 1.28"

September 1.63"

October 2.17"

November 2.70"

December 2.13"

Annual total 26.09"

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 21

Heating degree days How much heating the climate demands 9,283

Approximate annual cooling cost At 14.67¢/kWh, Montana average $3

Approximate annual electric heating cost Lower where heating is gas rather than electric $477

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 Glacier County, where electricity is one line of eight.

Common questions

What is the weather like in Glacier County?

Glacier County averages a high of 73.4°F in August and a low of 14.5°F in February. Annual precipitation is 26.09 inches, with essentially no snow.

When is the rainy season in Glacier County?

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

How hot does it get in Glacier County?

The average daily high in August, the hottest month, is 73.4°F. That drives 21 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Glacier County?

Effectively no. Measurable snowfall is rare in Glacier County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station ST. MARY 1 SSW, MT US (USW00004130), 20.3 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.