Salem, IL climate
Salem has cold, snowy winters and pleasant summers. A typical July afternoon reaches 84°, a January night drops to 13°, and about 33 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Salem feels like
Winter
Spring
Summer
Fall
Salem 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 | 29° | 13° | 1.5" | 10.2" | 9 | 20 | 11° – 33° |
| February | 34° | 17° | 1.7" | 7.9" | 8 | 16 | 12° – 37° |
| March | 47° | 28° | 2.4" | 3.6" | 9 | 6 | 29° – 52° |
| April | 60° | 37° | 3.7" | 0.8" | 11 | 0 | 40° – 56° |
| May | 72° | 49° | 4.4" | 0 | 13 | 0 | 55° – 67° |
| June | 81° | 59° | 5.2" | 0 | 12 | 0 | 67° – 74° |
| July | 84° | 62° | 4.5" | 0 | 9 | 0 | 67° – 79° |
| August | 82° | 60° | 4.0" | 0 | 9 | 0 | 65° – 77° |
| September | 75° | 52° | 3.7" | 0 | 9 | 0 | 58° – 69° |
| October | 63° | 40° | 2.9" | 0.4" | 9 | 0 | 47° – 57° |
| November | 47° | 29° | 2.4" | 1.7" | 8 | 2 | 30° – 47° |
| December | 34° | 19° | 1.9" | 8.8" | 9 | 13 | 13° – 37° |
| Year | 59° | 39° | 38.4" | 33.4" | 113 | 57 |
“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 Salem
Salem gets 38 inches of rain and melted snow a year. June is the wettest month and January the driest. Rain or snow falls on about 113 days a year. Snow covers the ground about 57 days of the year.
About 154 frost-free days a year
In half of years the last 32° night comes by May 2 and the first one by October 7. That leaves about 154 frost-free days for gardens, shorter than 77% of U.S. towns.
Heating and cooling a home in Salem
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Salem, 90% of that work is heating and 10% 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.
Salem and its neighbors
Salem borders 5 towns with climate data. January nights across them vary by 0.5°. Freedom has the coldest January nights (12°) and Mount Carroll the hottest July afternoons (84°). Salem’s January low is 13° and its July high 84°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Salem 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 Salem averaged 1.7° warmer than the 1900s. The biggest change is in December (+3.1°). The shift is larger than in 84% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Salem’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 12° to 37°. June is the most reliable, staying within 7°.
Common questions about Salem’s climate
What is the coldest month in Salem?
January, with a typical high of 29° and a low of 13°.
What is the hottest month in Salem?
July, with a typical high of 84° and a low of 62°. About 19 days a year reach 90°.
How much snow does Salem get?
About 33 inches in a normal winter, most of it in January.
When is the first frost in Salem?
In half of years the first 32° night comes by October 7, and the last spring frost by May 2.
What is the rainiest month in Salem?
June, with 5.2 inches of rain and melted snow. The year totals 38 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Salem itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Mt Carroll, IL (4 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.