Mullan, ID climate
Mullan has chilly, snowy winters and pleasant summers. A typical July afternoon reaches 79°, a January night drops to 23°, and about 76 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Mullan feels like
Winter
Spring
Summer
Fall
Mullan 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 | 30-yr range |
|---|---|---|---|---|---|---|
| January | 32° | 23° | 5.0" | 19.7" | 17 | 21° – 32° |
| February | 36° | 23° | 4.3" | 13.3" | 14 | 19° – 36° |
| March | 43° | 27° | 4.4" | 11.5" | 17 | 28° – 42° |
| April | 51° | 31° | 3.6" | 1.3" | 15 | 36° – 48° |
| May | 61° | 38° | 3.2" | 0.2" | 12 | 44° – 55° |
| June | 68° | 44° | 3.0" | 0 | 12 | 52° – 64° |
| July | 79° | 50° | 1.0" | 0 | 7 | 54° – 70° |
| August | 78° | 49° | 1.1" | 0 | 5 | 58° – 67° |
| September | 68° | 42° | 1.7" | 0 | 7 | 51° – 61° |
| October | 52° | 34° | 3.9" | 0.4" | 12 | 37° – 50° |
| November | 38° | 27° | 5.4" | 6.5" | 18 | 26° – 38° |
| December | 31° | 22° | 5.2" | 22.7" | 16 | 21° – 31° |
| Year | 53° | 34° | 41.8" | 75.6" | 151 |
“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 Mullan
Mullan gets 42 inches of rain and melted snow a year. November is the wettest month and July the driest. Rain or snow falls on about 151 days a year.
About 138 frost-free days a year
In half of years the last 32° night comes by May 12 and the first one by September 30. That leaves about 138 frost-free days for gardens, shorter than 90% of U.S. towns.
Heating and cooling a home in Mullan
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Mullan, 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 Mullan 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 Mullan averaged 1.2° warmer than the 1900s. The biggest change is in January (+3.8°). The shift is smaller than in 54% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Mullan’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 19° to 36°. August is the most reliable, staying within 9°.
Common questions about Mullan’s climate
What is the coldest month in Mullan?
December, with a typical high of 31° and a low of 22°.
What is the hottest month in Mullan?
July, with a typical high of 79° and a low of 50°. About 10 days a year reach 90°.
How much snow does Mullan get?
About 76 inches in a normal winter, most of it in December.
When is the first frost in Mullan?
In half of years the first 32° night comes by September 30, and the last spring frost by May 12.
What is the rainiest month in Mullan?
November, with 5.4 inches of rain and melted snow. The year totals 42 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Mullan itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Wallace, ID (6 mi, snow) and Mullan, ID (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.