Thompson Falls, MT climate
Thompson Falls has chilly winters and warm summers, with very little rain. A typical July afternoon reaches 86°, a January night drops to 22°, and about 15 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Thompson Falls feels like
Winter
Spring
Summer
Fall
Thompson Falls weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | 30-yr range |
|---|---|---|---|---|---|---|
| January | 34° | 22° | 2.2" | 2.5" | 18 | 20° – 33° |
| February | 39° | 23° | 1.8" | 0.6" | 15 | 20° – 37° |
| March | 49° | 28° | 1.9" | 1.2" | 16 | 32° – 46° |
| April | 58° | 33° | 1.7" | 0.3" | 15 | 40° – 52° |
| May | 69° | 40° | 2.0" | 0 | 14 | 49° – 59° |
| June | 75° | 46° | 2.2" | 0 | 13 | 57° – 68° |
| July | 86° | 50° | 0.8" | 0 | 7 | 58° – 75° |
| August | 86° | 49° | 0.8" | 0 | 5 | 62° – 70° |
| September | 75° | 42° | 1.1" | 0 | 8 | 54° – 64° |
| October | 58° | 34° | 2.1" | 0.7" | 13 | 40° – 52° |
| November | 41° | 28° | 2.6" | 2.5" | 17 | 29° – 40° |
| December | 33° | 23° | 2.4" | 7.5" | 17 | 21° – 32° |
| Year | 58° | 35° | 21.5" | 15.3" | 158 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in Thompson Falls
Thompson Falls gets 22 inches of rain and melted snow a year. November is the wettest month and August the driest. Rain or snow falls on about 158 days a year.
About 150 frost-free days a year
In half of years the last 32° night comes by May 7 and the first one by October 4. That leaves about 150 frost-free days for gardens, shorter than 81% of U.S. towns.
Heating and cooling a home in Thompson Falls
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Thompson Falls, 94% of that work is heating and 6% is cooling, so the furnace matters far more than the air conditioner.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
How Thompson Falls compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in Thompson Falls averaged 1.2° warmer than the 1900s. The biggest change is in January (+3.7°). The shift is smaller than in 55% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Thompson Falls’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. February swings the most: between 1991 and 2020 its average temperature ranged from 20° to 37°. August is the most reliable, staying within 8°.
Common questions about Thompson Falls’s climate
What is the coldest month in Thompson Falls?
January, with a typical high of 34° and a low of 22°.
What is the hottest month in Thompson Falls?
July, with a typical high of 86° and a low of 50°. About 39 days a year reach 90°.
How much snow does Thompson Falls get?
About 15 inches in a normal winter, most of it in December.
When is the first frost in Thompson Falls?
In half of years the first 32° night comes by October 4, and the last spring frost by May 7.
What is the rainiest month in Thompson Falls?
November, with 2.6 inches of rain and melted snow. The year totals 22 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Thompson Falls itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Thompson Falls Ph, MT (1 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.