Marion, IL
Climate overview — based on NOAA 1991-2020 normals from PLUMFIELD, IL US.
Year-round temperatures (°F)
Avg high
Avg low
Best time to visit Marion
Full guide →Monthly averages
| Month | Avg High | Avg Low | Avg Temp | Precipitation | Snow | Rainy days |
|---|---|---|---|---|---|---|
| January | °F | °F | °F | 3.33 in | 2.3 in | 8 |
| February | °F | °F | °F | 2.93 in | 2.9 in | 7 |
| March | °F | °F | °F | 4.11 in | 1.4 in | 9 |
| April | °F | °F | °F | 5.34 in | 0.1 in | 9 |
| May | °F | °F | °F | 5.02 in | — | 10 |
| June | °F | °F | °F | 4.47 in | — | 8 |
| July | °F | °F | °F | 3.76 in | — | 8 |
| August | °F | °F | °F | 2.55 in | — | 7 |
| September | °F | °F | °F | 3.09 in | — | 6 |
| October | °F | °F | °F | 3.30 in | 0.3 in | 6 |
| November | °F | °F | °F | 4.02 in | 0.1 in | 7 |
| December | °F | °F | °F | 3.58 in | 2.7 in | 8 |
Last spring / first fall frost
All-time recordsHottest, coldest, wettest
Planting calendarWhat to plant, and when