Oak Forest, IL Weather & Climate Normals
Oak Forest's real weather, in one number
Oak Forest, IL scores 45/100 on this site's reading of NOAA's own 30-year normals: strongly seasonal. Comfortable weather is limited to a shorter window; summers, winters, or precipitation swing wide. 5 of the year's 12 months average between 55 and 75°F, the range this site counts as mild.
Oak Forest's hottest and coldest months
Oak Forest's hottest month is Jul, averaging 74°F; its coldest is Jan, averaging 23°F, a 50.7°F swing across the year, one of the widest gaps in this dataset.
Oak Forest's weather across the year
| Month | Avg high | Avg low | Precip | Snow |
|---|---|---|---|---|
| Jan | 31°F | 15°F | 2.49in | 10.2in |
| Feb | 35°F | 18°F | 2.15in | 7.5in |
| Mar | 46°F | 28°F | 2.65in | 4.9in |
| Apr | 59°F | 38°F | 4.02in | 0.5in |
| May | 71°F | 49°F | 4.57in | 0in |
| Jun | 80°F | 59°F | 4.91in | 0in |
| Jul | 84°F | 64°F | 4.73in | 0in |
| Aug | 82°F | 62°F | 4.02in | 0in |
| Sep | 76°F | 55°F | 3.44in | 0in |
| Oct | 63°F | 42°F | 3.65in | 0.2in |
| Nov | 48°F | 31°F | 3in | 0.9in |
| Dec | 36°F | 22°F | 2.47in | 4in |
May, Jun, Jul, Aug, and Sep are the best time to see Oak Forest at its mildest; the rest of the year, plan around Jan's cold.
Rain and snow in Oak Forest
Oak Forest averages 42.1in of precipitation a year across roughly 124 days with measurable rain or snow, and 28.2in of snow a year.
Where Oak Forest ranks
Oak Forest ranks 3302 of 4876 US cities in this dataset for comfort score, and 123 of 330 within IL. About 26,813 people live there.
If you need tomorrow's forecast, not the 30-year average
Everything above is a 30-year average from Park Forest, IL US, 8.6 miles from Oak Forest, not a prediction for any specific day.
More on how this is worked out
How the comfort score is calculated · Why some cities show no snow or rain figure