Twin Bridges, MT climate
Twin Bridges has cold winters and warm summers, with very little rain. A typical July afternoon reaches 85°, a January night drops to 12°, and about 10 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Twin Bridges feels like
Winter
Spring
Summer
Fall
Twin Bridges 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 | 35° | 12° | 0.2" | 2.0" | 3 | 10 | 16° – 30° |
| February | 38° | 14° | 0.2" | 1.2" | 3 | 3 | 16° – 34° |
| March | 48° | 22° | 0.4" | 1.2" | 4 | 1 | 28° – 41° |
| April | 56° | 28° | 0.9" | 1.1" | 6 | 0 | 37° – 46° |
| May | 66° | 36° | 1.7" | 0 | 8 | 0 | 46° – 55° |
| June | 74° | 43° | 2.1" | 0 | 9 | 0 | 53° – 65° |
| July | 85° | 48° | 1.0" | 0 | 6 | 0 | 57° – 72° |
| August | 83° | 45° | 0.8" | 0 | 6 | 0 | 59° – 68° |
| September | 73° | 38° | 0.8" | 0 | 4 | 0 | 52° – 59° |
| October | 59° | 29° | 0.7" | 0.3" | 4 | 0 | 36° – 50° |
| November | 44° | 19° | 0.3" | 1.8" | 4 | 4 | 21° – 39° |
| December | 34° | 11° | 0.3" | 2.5" | 3 | 10 | 15° – 27° |
| Year | 58° | 29° | 9.2" | 10.1" | 58 | 29 |
“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 Twin Bridges
Twin Bridges gets 9 inches of rain and melted snow a year. June is the wettest month and January the driest. Rain or snow falls on about 58 days a year. Snow covers the ground about 29 days of the year.
About 82 frost-free days a year
In half of years the last 32° night comes by June 8 and the first one by September 2. That leaves about 82 frost-free days for gardens, shorter than 100% of U.S. towns.
Heating and cooling a home in Twin Bridges
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Twin Bridges, 99% of that work is heating and 1% 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 Twin Bridges 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 Twin Bridges averaged 1.5° warmer than the 1900s. The biggest change is in January (+3.8°). The shift is larger than in 68% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Twin Bridges’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. November swings the most: between 1991 and 2020 its average temperature ranged from 21° to 39°. September is the most reliable, staying within 7°.
Common questions about Twin Bridges’s climate
What is the coldest month in Twin Bridges?
December, with a typical high of 34° and a low of 11°.
What is the hottest month in Twin Bridges?
July, with a typical high of 85° and a low of 48°. About 17 days a year reach 90°.
How much snow does Twin Bridges get?
About 10 inches in a normal winter, most of it in December.
When is the first frost in Twin Bridges?
In half of years the first 32° night comes by September 2, and the last spring frost by June 8.
What is the rainiest month in Twin Bridges?
June, with 2.1 inches of rain and melted snow. The year totals 9 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Twin Bridges itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Glen 4 N, MT (18 mi, snow) and Twin Bridges, MT (1 mi, frost, heat and degree days). Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.