River Forest, IL
Climate overview — based on NOAA 1991-2020 normals from CHICAGO OHARE INTL AP, IL US.
Year-round temperatures (°F)
Climate summary
River Forest has an annual average temperature of 51.3°F with about 37.9 inches of precipitation per year and 38.4 inches of snow. The warmest month is July (average high 84.5°F), and the coldest is January (average low 18.8°F). May is typically the wettest month (4.49 in) and February the driest (1.97 in). Snow typically falls from October through April.
Best time to visit River Forest
Full guide →Climate change signal
All-time records →64 of 366 (17.5%) of River Forest'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.
| 1950s | 6 | |
| 1960s | 46 | |
| 1970s | 53 | |
| 1980s | 71 | |
| 1990s | 51 | |
| 2000s | 41 | |
| 2010s | 59 | |
| 2020s | 39 |
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 | 31.6°F | 18.8°F | 25.2°F | 1.99 in | 11.3 in | 11 |
| February | 35.7°F | 21.8°F | 28.8°F | 1.97 in | 10.7 in | 9 |
| March | 47.0°F | 31.0°F | 39.0°F | 2.45 in | 5.5 in | 11 |
| April | 59.0°F | 40.3°F | 49.7°F | 3.75 in | 1.3 in | 12 |
| May | 70.5°F | 50.6°F | 60.6°F | 4.49 in | — | 13 |
| June | 80.4°F | 60.8°F | 70.6°F | 4.10 in | — | 11 |
| July | 84.5°F | 66.4°F | 75.4°F | 3.71 in | — | 10 |
| August | 82.5°F | 65.1°F | 73.8°F | 4.25 in | — | 9 |
| September | 75.5°F | 57.1°F | 66.3°F | 3.19 in | — | 9 |
| October | 62.7°F | 45.4°F | 54.0°F | 3.43 in | 0.2 in | 11 |
| November | 48.4°F | 34.1°F | 41.3°F | 2.42 in | 1.8 in | 10 |
| December | 36.6°F | 24.4°F | 30.5°F | 2.11 in | 7.6 in | 11 |
Climate twins of River Forest
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).