Troy, MT climate
Troy has chilly, snowy winters and warm summers. A typical July afternoon reaches 84°, a January night drops to 21°, and about 48 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Troy feels like
Winter
Spring
Summer
Fall
Troy 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 | 33° | 21° | 2.8" | 11.8" | 14 | 30 | 17° – 32° |
| February | 38° | 22° | 1.8" | 5.4" | 10 | 22 | 21° – 37° |
| March | 48° | 27° | 2.3" | 3.8" | 12 | 10 | 32° – 43° |
| April | 57° | 32° | 1.7" | 0.2" | 10 | 0 | 40° – 52° |
| May | 68° | 39° | 1.9" | 0 | 10 | 0 | 48° – 60° |
| June | 74° | 45° | 2.1" | 0 | 12 | 0 | 55° – 67° |
| July | 84° | 49° | 0.8" | 0 | 7 | 0 | 57° – 72° |
| August | 84° | 48° | 0.7" | 0 | 5 | 0 | 60° – 69° |
| September | 72° | 41° | 1.2" | 0 | 7 | 0 | 52° – 61° |
| October | 55° | 33° | 2.1" | 0.3" | 10 | 0 | 39° – 50° |
| November | 40° | 27° | 3.3" | 6.3" | 13 | 6 | 26° – 41° |
| December | 32° | 22° | 3.0" | 20.4" | 14 | 25 | 20° – 32° |
| Year | 57° | 34° | 23.7" | 48.2" | 125 | 93 |
“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 Troy
Troy gets 24 inches of rain and melted snow a year. November is the wettest month and August the driest. Rain or snow falls on about 125 days a year. Snow covers the ground about 93 days of the year.
About 132 frost-free days a year
In half of years the last 32° night comes by May 14 and the first one by September 25. That leaves about 132 frost-free days for gardens, shorter than 94% of U.S. towns.
Heating and cooling a home in Troy
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Troy, 96% of that work is heating and 4% 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 Troy 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 Troy averaged 1.6° warmer than the 1900s. The biggest change is in January (+4.6°). The shift is larger than in 77% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Troy’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 21° to 37°. September is the most reliable, staying within 8°.
Common questions about Troy’s climate
What is the coldest month in Troy?
January, with a typical high of 33° and a low of 21°.
What is the hottest month in Troy?
July, with a typical high of 84° and a low of 49°. About 34 days a year reach 90°.
How much snow does Troy get?
About 48 inches in a normal winter, most of it in December.
When is the first frost in Troy?
In half of years the first 32° night comes by September 25, and the last spring frost by May 14.
What is the rainiest month in Troy?
November, with 3.3 inches of rain and melted snow. The year totals 24 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Troy itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Libby 1 Ne Rs, MT (17 mi, snow) and Troy, MT (2 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.