Marion, IL Weather & Climate Normals
What a normal year in Marion actually looks like
On the 30-year record NOAA keeps for Marion, IL, the comfort score comes out to 48/100, 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 Marion's weather actually swings
Average temperatures in Marion run from 32°F in Jan up to 78°F in Jul, a 45.6°F seasonal swing, one of the widest gaps in this dataset.
Marion, month by month
| Month | Avg high | Avg low | Precip | Snow |
|---|---|---|---|---|
| Jan | 41°F | 23°F | 3.36in | 3.2in |
| Feb | 46°F | 26°F | 3.11in | 4in |
| Mar | 56°F | 35°F | 4.52in | 1.3in |
| Apr | 68°F | 44°F | 5.55in | 0in |
| May | 77°F | 55°F | 5.18in | 0in |
| Jun | 85°F | 64°F | 4.6in | 0in |
| Jul | 88°F | 68°F | 4.12in | 0in |
| Aug | 87°F | 65°F | 3.16in | 0in |
| Sep | 81°F | 56°F | 3.44in | 0in |
| Oct | 70°F | 44°F | 3.7in | 0.2in |
| Nov | 56°F | 35°F | 4.49in | 0in |
| Dec | 45°F | 27°F | 3.72in | 2.7in |
If you're timing a visit, Apr, May, Jun, Sep, and Oct are Marion's mildest stretch; if you're moving there, you should plan around Jul's heat and Jan's cold instead.
How wet Marion actually gets
Over a typical year, Marion sees about 48.95in of precipitation a year across roughly 121 days with measurable rain or snow, with 11.4in of snow a year.
Marion against the rest of the country
Out of 4876 cities scored here, Marion comes in at 2376; within IL alone it ranks 49 of 330. Population is about 17,021.
Checking the actual forecast
These figures come from Carbondale Sewage Plt, IL US, the NOAA station 12.3 miles from Marion, averaged over 30 years, not tomorrow's forecast.
More on how this is worked out
Why this uses the nearest NOAA station · How the comfort score is calculated