River Forest, IL Weather & Climate Normals
What a normal year in River Forest actually looks like
On the 30-year record NOAA keeps for River Forest, 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 River Forest's weather actually swings
Average temperatures in River Forest run from 26°F in Jan up to 76°F in Jul, a 50.3°F seasonal swing, one of the widest gaps in this dataset.
River Forest, month by month
| Month | Avg high | Avg low | Precip |
|---|---|---|---|
| Jan | 33°F | 19°F | 1.48in |
| Feb | 37°F | 23°F | 1.46in |
| Mar | 48°F | 32°F | 1.88in |
| Apr | 60°F | 41°F | 3.57in |
| May | 71°F | 52°F | 4.09in |
| Jun | 81°F | 62°F | 4.01in |
| Jul | 85°F | 68°F | 3.55in |
| Aug | 83°F | 66°F | 3.99in |
| Sep | 76°F | 59°F | 2.77in |
| Oct | 63°F | 47°F | 3.48in |
| Nov | 49°F | 35°F | 2.35in |
| Dec | 38°F | 25°F | 1.79in |
If you're timing a visit, May, Jun, Aug, Sep, and Oct are River Forest's mildest stretch; if you're moving there, you should plan around Jul's heat and Jan's cold instead.
How wet River Forest actually gets
River Forest averages 34.42in of precipitation a year across roughly 121 days with measurable rain or snow; the nearest NOAA station does not record snowfall, so no snow figure is shown rather than guessed.
River Forest against the rest of the country
Out of 4876 cities scored here, River Forest comes in at 2414; within IL alone it ranks 59 of 330. Population is about 11,909.
Checking the actual forecast
These figures come from Chicago Midway Ap, IL US, the NOAA station 8.3 miles from River Forest, 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