Mattoon, IL Weather & Climate Normals
What a normal year in Mattoon actually looks like
On the 30-year record NOAA keeps for Mattoon, IL, the comfort score comes out to 47/100, strongly seasonal: Comfortable weather is limited to a shorter window; summers, winters, or precipitation swing wide. Only 5 months a year land in the 55–75°F range this site treats as mild.
How much Mattoon's weather actually swings
Average temperatures in Mattoon run from 28°F in Jan up to 76°F in Jul, a 48.9°F seasonal swing, one of the widest gaps in this dataset.
Mattoon, month by month
| Month | Avg high | Avg low | Precip | Snow |
|---|---|---|---|---|
| Jan | 35°F | 20°F | 2.61in | 5.2in |
| Feb | 40°F | 23°F | 2.18in | 3.6in |
| Mar | 51°F | 33°F | 2.81in | 1.9in |
| Apr | 64°F | 43°F | 4.78in | 0.1in |
| May | 74°F | 54°F | 4.1in | 0in |
| Jun | 83°F | 64°F | 4.71in | 0in |
| Jul | 86°F | 67°F | 4.26in | 0in |
| Aug | 85°F | 65°F | 2.85in | 0in |
| Sep | 79°F | 57°F | 3.11in | 0in |
| Oct | 66°F | 47°F | 3.77in | 0in |
| Nov | 51°F | 34°F | 3.56in | 0.6in |
| Dec | 40°F | 25°F | 2.55in | 3.1in |
If you're timing a visit, May, Jun, Aug, Sep, and Oct are Mattoon's mildest stretch; if you're moving there, you should plan around Jul's heat and Jan's cold instead.
How wet Mattoon actually gets
Over a typical year, Mattoon sees about 41.29in of precipitation a year across roughly 114 days with measurable rain or snow, with 14.5in of snow a year.
Mattoon against the rest of the country
Out of 4876 cities scored here, Mattoon comes in at 2682; within IL alone it ranks 86 of 330. Population is about 16,602.
Checking the actual forecast
These figures come from Mattoon, IL US, the NOAA station 0.6 miles from Mattoon, averaged over 30 years, not tomorrow's forecast.
More on how this is worked out
Why some cities show no snow or rain figure · What a 30-year climate normal actually is