St. Xavier, MT climate
St. Xavier has cold winters and warm summers, with very little rain. A typical July afternoon reaches 90°, a January night drops to 13°, and about 28 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in St. Xavier feels like
Winter
Spring
Summer
Fall
St. Xavier 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 | 36° | 13° | 0.6" | 6.0" | 5 | 13 | 14° – 36° |
| February | 40° | 15° | 0.7" | 6.2" | 5 | 8 | 8° – 38° |
| March | 51° | 24° | 0.8" | 3.4" | 6 | 4 | 26° – 47° |
| April | 60° | 32° | 1.7" | 1.3" | 7 | 1 | 40° – 51° |
| May | 69° | 42° | 2.4" | 0 | 9 | 0 | 51° – 60° |
| June | 80° | 51° | 2.1" | 0 | 8 | 0 | 59° – 70° |
| July | 90° | 57° | 1.0" | 0 | 5 | 0 | 63° – 79° |
| August | 88° | 54° | 0.8" | 0 | 4 | 0 | 65° – 77° |
| September | 76° | 45° | 1.4" | 0 | 5 | 0 | 56° – 67° |
| October | 62° | 33° | 1.5" | 1.6" | 7 | 1 | 40° – 53° |
| November | 47° | 22° | 0.7" | 3.1" | 5 | 3 | 23° – 45° |
| December | 36° | 14° | 0.6" | 6.3" | 4 | 10 | 15° – 34° |
| Year | 61° | 33° | 14.2" | 27.9" | 70 | 40 |
“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 St. Xavier
St. Xavier gets 14 inches of rain and melted snow a year. May is the wettest month and December the driest. Rain or snow falls on about 70 days a year. Snow covers the ground about 40 days of the year.
About 135 frost-free days a year
In half of years the last 32° night comes by May 13 and the first one by September 29. That leaves about 135 frost-free days for gardens, shorter than 92% of U.S. towns.
Heating and cooling a home in St. Xavier
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In St. Xavier, 92% of that work is heating and 8% 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 St. Xavier 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 St. Xavier averaged 1.3° warmer than the 1900s. The biggest change is in January (+4.0°). The shift is larger than in 58% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at St. Xavier’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 8° to 38°. May is the most reliable, staying within 10°.
Common questions about St. Xavier’s climate
What is the coldest month in St. Xavier?
January, with a typical high of 36° and a low of 13°.
What is the hottest month in St. Xavier?
July, with a typical high of 90° and a low of 57°. About 52 days a year reach 90°.
How much snow does St. Xavier get?
About 28 inches in a normal winter, most of it in December.
When is the first frost in St. Xavier?
In half of years the first 32° night comes by September 29, and the last spring frost by May 13.
What is the rainiest month in St. Xavier?
May, with 2.4 inches of rain and melted snow. The year totals 14 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for St. Xavier itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Hardin, MT (20 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.