Geyser, MT climate
Geyser has cold winters and pleasant summers, with very little rain. A typical July afternoon reaches 82°, a January night drops to 13°.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Geyser feels like
Winter
Spring
Summer
Fall
Geyser weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | 30-yr range |
|---|---|---|---|---|
| January | 36° | 13° | 0.6" | 13° – 35° |
| February | 38° | 15° | 0.6" | 3° – 38° |
| March | 45° | 22° | 0.9" | 18° – 41° |
| April | 53° | 29° | 1.7" | 35° – 46° |
| May | 63° | 38° | 2.8" | 45° – 55° |
| June | 71° | 45° | 3.1" | 55° – 62° |
| July | 82° | 50° | 1.5" | 56° – 74° |
| August | 82° | 49° | 1.5" | 59° – 70° |
| September | 71° | 41° | 1.6" | 51° – 62° |
| October | 57° | 31° | 1.3" | 35° – 49° |
| November | 44° | 22° | 0.6" | 23° – 43° |
| December | 36° | 15° | 0.6" | 14° – 34° |
| Year | 57° | 31° | 16.7" |
“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 Geyser
Geyser gets 17 inches of rain and melted snow a year. June is the wettest month and February the driest.
About 118 frost-free days a year
In half of years the last 32° night comes by May 25 and the first one by September 21. That leaves about 118 frost-free days for gardens, shorter than 98% of U.S. towns.
Heating and cooling a home in Geyser
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Geyser, 97% of that work is heating and 3% 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 Geyser 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 Geyser averaged 1.2° warmer than the 1900s. The biggest change is in January (+4.5°). The shift is smaller than in 56% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Geyser’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 3° to 38°. June is the most reliable, staying within 8°.
Common questions about Geyser’s climate
What is the coldest month in Geyser?
January, with a typical high of 36° and a low of 13°.
What is the hottest month in Geyser?
July, with a typical high of 82° and a low of 50°. About 11 days a year reach 90°.
When is the first frost in Geyser?
In half of years the first 32° night comes by September 21, and the last spring frost by May 25.
What is the rainiest month in Geyser?
June, with 3.1 inches of rain and melted snow. The year totals 17 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Geyser itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Stanford, MT (15 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.