Warren, IL climate
Warren has cold, snowy winters and pleasant summers. A typical July afternoon reaches 82°, a January night drops to 11°, and about 32 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Warren feels like
Winter
Spring
Summer
Fall
Warren 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 | 28° | 11° | 1.4" | 10.5" | 5 | 10° – 32° |
| February | 32° | 15° | 1.6" | 7.7" | 5 | 11° – 36° |
| March | 45° | 26° | 2.3" | 3.9" | 6 | 27° – 51° |
| April | 59° | 36° | 3.9" | 0.8" | 8 | 38° – 54° |
| May | 70° | 48° | 4.3" | 0 | 9 | 53° – 66° |
| June | 79° | 58° | 5.7" | 0 | 9 | 65° – 73° |
| July | 82° | 61° | 4.7" | 0 | 7 | 66° – 78° |
| August | 81° | 59° | 4.0" | 0 | 7 | 64° – 76° |
| September | 74° | 51° | 4.0" | 0 | 6 | 56° – 68° |
| October | 61° | 39° | 3.1" | 0.2" | 6 | 46° – 56° |
| November | 46° | 28° | 2.4" | 1.1" | 5 | 29° – 47° |
| December | 33° | 18° | 1.8" | 7.9" | 6 | 11° – 36° |
| Year | 58° | 38° | 39.2" | 32.1" | 78 |
“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 Warren
Warren gets 39 inches of rain and melted snow a year. June is the wettest month and January the driest. Rain or snow falls on about 78 days a year.
About 165 frost-free days a year
In half of years the last 32° night comes by April 27 and the first one by October 9. That leaves about 165 frost-free days for gardens, shorter than 65% of U.S. towns.
Heating and cooling a home in Warren
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Warren, 91% of that work is heating and 9% 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.
Warren and its neighbors
Warren borders 5 towns with climate data. January nights across them vary by 0.4°. Apple River has the coldest January nights (11°) and Gratiot the hottest July afternoons (83°). Warren’s January low is 11° and its July high 82°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Warren 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 Warren averaged 1.4° warmer than the 1900s. The biggest change is in December (+2.7°). The shift is larger than in 62% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Warren’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 11° to 36°. June is the most reliable, staying within 8°.
Common questions about Warren’s climate
What is the coldest month in Warren?
January, with a typical high of 28° and a low of 11°.
What is the hottest month in Warren?
July, with a typical high of 82° and a low of 61°. About 8 days a year reach 90°.
How much snow does Warren get?
About 32 inches in a normal winter, most of it in January.
When is the first frost in Warren?
In half of years the first 32° night comes by October 9, and the last spring frost by April 27.
What is the rainiest month in Warren?
June, with 5.7 inches of rain and melted snow. The year totals 39 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Warren itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Apple Rvr Canyon St Pk, IL (3 mi, snow) and Stockton 3 Nne, IL (6 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.