Mount Morris, IL climate
Mount Morris has cold, snowy winters and pleasant summers. A typical July afternoon reaches 83°, a January night drops to 13°, and about 32 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Mount Morris feels like
Winter
Spring
Summer
Fall
Mount Morris 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 | 29° | 13° | 1.7" | 13.6" | 7 | 11° – 33° |
| February | 34° | 17° | 1.8" | 6.7" | 6 | 12° – 37° |
| March | 46° | 27° | 2.5" | 3.0" | 7 | 29° – 52° |
| April | 60° | 37° | 3.8" | 0.8" | 8 | 40° – 55° |
| May | 71° | 49° | 4.6" | 0 | 10 | 54° – 66° |
| June | 80° | 59° | 5.3" | 0 | 9 | 66° – 74° |
| July | 83° | 62° | 4.2" | 0 | 7 | 67° – 79° |
| August | 81° | 60° | 4.1" | 0 | 7 | 65° – 77° |
| September | 75° | 52° | 3.6" | 0 | 7 | 58° – 69° |
| October | 62° | 41° | 3.0" | 0 | 7 | 47° – 58° |
| November | 47° | 30° | 2.5" | 1.5" | 6 | 30° – 47° |
| December | 34° | 19° | 2.0" | 6.7" | 7 | 12° – 37° |
| Year | 58° | 39° | 39.1" | 32.3" | 88 |
“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 Mount Morris
Mount Morris 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 88 days a year.
About 161 frost-free days a year
In half of years the last 32° night comes by April 29 and the first one by October 7. That leaves about 161 frost-free days for gardens, shorter than 70% of U.S. towns.
Heating and cooling a home in Mount Morris
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Mount Morris, 89% of that work is heating and 11% 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 Mount Morris 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 Mount Morris averaged 1.3° warmer than the 1900s. The biggest change is in December (+2.7°). The shift is larger than in 58% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Mount Morris’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 8°.
Common questions about Mount Morris’s climate
What is the coldest month in Mount Morris?
January, with a typical high of 29° and a low of 13°.
What is the hottest month in Mount Morris?
July, with a typical high of 83° and a low of 62°. About 17 days a year reach 90°.
How much snow does Mount Morris get?
About 32 inches in a normal winter, most of it in January.
When is the first frost in Mount Morris?
In half of years the first 32° night comes by October 7, and the last spring frost by April 29.
What is the rainiest month in Mount Morris?
June, with 5.3 inches of rain and melted snow. The year totals 39 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Mount Morris itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Oregon, IL (6 mi, snow) and Polo 5nw, IL (9 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.