Mattoon, IL
Climate overview — based on NOAA 1991-2020 normals from MATTOON, IL US.
Year-round temperatures (°F)
Climate summary
Mattoon has an annual average temperature of 53.6°F with about 41.3 inches of precipitation per year and 14.5 inches of snow. The warmest month is July (average high 86.1°F), and the coldest is January (average low 20.2°F). April is typically the wettest month (4.78 in) and February the driest (2.18 in). Snow typically falls from November through March.
Best time to visit Mattoon
Full guide →Climate change signal
All-time records →0 of 366 (0%) of Mattoon's all-time daily heat records have been set since 2015. If records were spread evenly across the station's history, only about 5% would fall in any given decade.
| 1890s | 28 | |
| 1900s | 42 | |
| 1940s | 6 | |
| 1950s | 89 | |
| 1960s | 51 | |
| 1970s | 35 | |
| 1980s | 74 | |
| 1990s | 32 | |
| 2000s | 9 | |
| 2010s | 0 | |
| 2020s | 0 |
Bars: number of all-time daily heat records still standing that were set in each decade.
Monthly averages
| Month | Avg High | Avg Low | Avg Temp | Precipitation | Snow | Rainy days |
|---|---|---|---|---|---|---|
| January | 34.8°F | 20.2°F | 27.5°F | 2.61 in | 5.2 in | 10 |
| February | 39.6°F | 23.4°F | 31.5°F | 2.18 in | 3.6 in | 8 |
| March | 51.3°F | 32.9°F | 42.1°F | 2.81 in | 1.9 in | 10 |
| April | 64.4°F | 43.3°F | 53.8°F | 4.78 in | 0.1 in | 11 |
| May | 74.3°F | 54.0°F | 64.1°F | 4.10 in | — | 13 |
| June | 82.8°F | 63.8°F | 73.3°F | 4.71 in | — | 11 |
| July | 86.1°F | 66.6°F | 76.4°F | 4.26 in | — | 9 |
| August | 84.5°F | 65.1°F | 74.8°F | 2.85 in | — | 8 |
| September | 79.2°F | 56.6°F | 67.9°F | 3.11 in | — | 7 |
| October | 66.4°F | 46.6°F | 56.5°F | 3.77 in | — | 9 |
| November | 51.2°F | 34.2°F | 42.7°F | 3.56 in | 0.6 in | 10 |
| December | 39.7°F | 25.4°F | 32.5°F | 2.55 in | 3.1 in | 9 |
Climate twins of Mattoon
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).