State Line, ID climate
State Line has chilly, snowy winters and pleasant summers. A typical July afternoon reaches 84°, a January night drops to 25°, and about 45 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in State Line feels like
Winter
Spring
Summer
Fall
State Line 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° | 25° | 3.2" | 12.3" | 14 | 16 | 24° – 36° |
| February | 41° | 26° | 2.2" | 7.8" | 11 | 10 | 23° – 40° |
| March | 49° | 30° | 2.6" | 3.9" | 12 | 4 | 34° – 47° |
| April | 57° | 34° | 2.1" | 0.7" | 10 | 0 | 41° – 54° |
| May | 67° | 42° | 2.1" | 0.1" | 10 | 0 | 49° – 60° |
| June | 73° | 48° | 2.0" | 0 | 8 | 0 | 56° – 69° |
| July | 84° | 53° | 0.8" | 0 | 4 | 0 | 57° – 73° |
| August | 83° | 52° | 0.6" | 0 | 3 | 0 | 61° – 71° |
| September | 74° | 44° | 1.0" | 0.1" | 5 | 0 | 54° – 65° |
| October | 58° | 35° | 2.2" | 0.5" | 9 | 0 | 41° – 53° |
| November | 43° | 30° | 3.2" | 6.2" | 13 | 4 | 30° – 44° |
| December | 35° | 25° | 3.5" | 13.8" | 14 | 13 | 24° – 34° |
| Year | 58° | 37° | 25.4" | 45.4" | 113 | 48 |
“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 State Line
State Line gets 25 inches of rain and melted snow a year. December is the wettest month and August the driest. Rain or snow falls on about 113 days a year. Snow covers the ground about 48 days of the year.
About 179 frost-free days a year
In half of years the last 32° night comes by April 22 and the first one by October 18. That leaves about 179 frost-free days for gardens, longer than 51% of U.S. towns.
Heating and cooling a home in State Line
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In State Line, 94% of that work is heating and 6% 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 State Line 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 State Line averaged 1.5° warmer than the 1900s. The biggest change is in January (+4.5°). The shift is larger than in 68% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at State Line’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 23° to 40°. August is the most reliable, staying within 10°.
Common questions about State Line’s climate
What is the coldest month in State Line?
December, with a typical high of 35° and a low of 25°.
What is the hottest month in State Line?
July, with a typical high of 84° and a low of 53°. About 18 days a year reach 90°.
How much snow does State Line get?
About 45 inches in a normal winter, most of it in December.
When is the first frost in State Line?
In half of years the first 32° night comes by October 18, and the last spring frost by April 22.
What is the rainiest month in State Line?
December, with 3.5 inches of rain and melted snow. The year totals 25 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for State Line itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Spokane Intl Airport, WA (24 mi, snow) and Coeur D'alene, ID (11 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.