Fort Benton, MT climate
Fort Benton has cold, snowy winters and warm summers, with very little rain. A typical July afternoon reaches 87°, a January night drops to 10°, and about 38 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Fort Benton feels like
Winter
Spring
Summer
Fall
Fort Benton 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 | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 34° | 10° | 0.5" | 7.9" | 5 | 15 | 9° – 37° |
| February | 38° | 13° | 0.4" | 6.9" | 6 | 11 | -2° – 39° |
| March | 48° | 21° | 0.6" | 4.3" | 6 | 6 | 18° – 43° |
| April | 59° | 31° | 1.5" | 3.0" | 8 | 2 | 40° – 49° |
| May | 68° | 40° | 2.2" | 0.3" | 10 | 0 | 50° – 59° |
| June | 77° | 48° | 2.7" | 0 | 11 | 0 | 59° – 67° |
| July | 87° | 53° | 1.3" | 0 | 6 | 0 | 61° – 77° |
| August | 86° | 51° | 1.2" | 0 | 6 | 0 | 63° – 74° |
| September | 74° | 42° | 1.3" | 0.3" | 7 | 0 | 54° – 64° |
| October | 60° | 31° | 1.0" | 1.9" | 7 | 1 | 37° – 52° |
| November | 46° | 21° | 0.6" | 5.7" | 6 | 5 | 22° – 42° |
| December | 36° | 12° | 0.5" | 7.9" | 5 | 10 | 11° – 35° |
| Year | 59° | 31° | 13.6" | 38.2" | 82 | 50 |
“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 Fort Benton
Fort Benton gets 14 inches of rain and melted snow a year. June is the wettest month and February the driest. Rain or snow falls on about 82 days a year. Snow covers the ground about 50 days of the year.
About 129 frost-free days a year
In half of years the last 32° night comes by May 15 and the first one by September 22. That leaves about 129 frost-free days for gardens, shorter than 95% of U.S. towns.
Heating and cooling a home in Fort Benton
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Fort Benton, 95% of that work is heating and 5% 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 Fort Benton 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 Fort Benton averaged 1.4° warmer than the 1900s. The biggest change is in January (+4.6°). The shift is larger than in 64% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Fort Benton’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 -2° to 39°. June is the most reliable, staying within 8°.
Common questions about Fort Benton’s climate
What is the coldest month in Fort Benton?
January, with a typical high of 34° and a low of 10°.
What is the hottest month in Fort Benton?
July, with a typical high of 87° and a low of 53°. About 31 days a year reach 90°.
How much snow does Fort Benton get?
About 38 inches in a normal winter, most of it in January.
When is the first frost in Fort Benton?
In half of years the first 32° night comes by September 22, and the last spring frost by May 15.
What is the rainiest month in Fort Benton?
June, with 2.7 inches of rain and melted snow. The year totals 14 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Fort Benton itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Ft Benton, MT (1 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.