St. Maries, ID climate
St. Maries has chilly, snowy winters and warm summers. A typical July afternoon reaches 85°, a January night drops to 25°, and about 56 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in St. Maries feels like
Winter
Spring
Summer
Fall
St. Maries 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 | 37° | 25° | 3.9" | 16.3" | 16 | 20 | 23° – 37° |
| February | 42° | 26° | 2.7" | 8.6" | 13 | 14 | 24° – 41° |
| March | 50° | 30° | 3.0" | 5.2" | 14 | 7 | 34° – 46° |
| April | 58° | 34° | 2.3" | 0.7" | 13 | 0 | 41° – 53° |
| May | 68° | 41° | 2.4" | 0.1" | 12 | 0 | 50° – 59° |
| June | 74° | 47° | 2.0" | 0 | 11 | 0 | 56° – 69° |
| July | 85° | 51° | 0.8" | 0 | 5 | 0 | 59° – 73° |
| August | 85° | 50° | 0.8" | 0 | 4 | 0 | 62° – 70° |
| September | 74° | 43° | 1.1" | 0 | 6 | 0 | 55° – 64° |
| October | 59° | 35° | 2.3" | 0.2" | 11 | 0 | 41° – 53° |
| November | 44° | 30° | 3.7" | 6.6" | 15 | 5 | 30° – 44° |
| December | 37° | 25° | 3.8" | 18.3" | 16 | 16 | 26° – 35° |
| Year | 59° | 36° | 28.6" | 56.0" | 136 | 62 |
“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. Maries
St. Maries gets 29 inches of rain and melted snow a year. January is the wettest month and July the driest. Rain or snow falls on about 136 days a year. Snow covers the ground about 62 days of the year.
About 152 frost-free days a year
In half of years the last 32° night comes by May 3 and the first one by October 4. That leaves about 152 frost-free days for gardens, shorter than 79% of U.S. towns.
Heating and cooling a home in St. Maries
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In St. Maries, 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 St. Maries 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. Maries averaged 1.1° warmer than the 1900s. The biggest change is in January (+3.8°). The shift is smaller than in 65% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at St. Maries’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 24° to 41°. August is the most reliable, staying within 8°.
Common questions about St. Maries’s climate
What is the coldest month in St. Maries?
December, with a typical high of 37° and a low of 25°.
What is the hottest month in St. Maries?
August, with a typical high of 85° and a low of 50°. About 20 days a year reach 90°.
How much snow does St. Maries get?
About 56 inches in a normal winter, most of it in December.
When is the first frost in St. Maries?
In half of years the first 32° night comes by October 4, and the last spring frost by May 3.
What is the rainiest month in St. Maries?
January, with 3.9 inches of rain and melted snow. The year totals 29 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for St. Maries itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Saint Maries, ID (1 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.