Joliet, IL
Climate overview — based on NOAA 1991-2020 normals from JOLIET BRANDON RD DAM, IL US.
Year-round temperatures (°F)
Climate summary
Joliet has an annual average temperature of 50.4°F with about 38 inches of precipitation per year and 16.9 inches of snow. The warmest month is July (average high 83.6°F), and the coldest is January (average low 16.6°F). July is typically the wettest month (4.55 in) and February the driest (1.78 in). Snow typically falls from November through March.
Best time to visit Joliet
Full guide →Climate change signal
All-time records →66 of 366 (18%) of Joliet'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.
| 1940s | 0 | |
| 1950s | 0 | |
| 1960s | 0 | |
| 1970s | 35 | |
| 1980s | 92 | |
| 1990s | 65 | |
| 2000s | 74 | |
| 2010s | 61 | |
| 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 | 31.1°F | 16.6°F | 23.9°F | 1.99 in | 5.0 in | 11 |
| February | 35.4°F | 19.8°F | 27.6°F | 1.78 in | 6.2 in | 9 |
| March | 47.0°F | 29.2°F | 38.1°F | 2.27 in | 2.1 in | 10 |
| April | 59.9°F | 38.9°F | 49.4°F | 3.93 in | 0.1 in | 12 |
| May | 71.0°F | 49.4°F | 60.2°F | 4.53 in | — | 12 |
| June | 80.3°F | 59.9°F | 70.1°F | 4.30 in | — | 11 |
| July | 83.6°F | 64.1°F | 73.9°F | 4.55 in | — | 9 |
| August | 81.8°F | 62.9°F | 72.3°F | 3.97 in | — | 9 |
| September | 76.2°F | 55.3°F | 65.7°F | 3.17 in | — | 8 |
| October | 63.3°F | 43.4°F | 53.3°F | 3.14 in | — | 10 |
| November | 48.5°F | 32.3°F | 40.4°F | 2.46 in | 0.3 in | 10 |
| December | 36.4°F | 22.4°F | 29.4°F | 1.94 in | 3.2 in | 11 |
Climate twins of Joliet
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).