| 2023 Hardiness Zone: | Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 5a: -20F to -15F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 54a - Illinois/Indiana Prairies |
| Heat Zone Days: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 61364 - Streator, IL | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 13 | 18 | 29 | 39 | 50 | 59 | 63 | 61 | 53 | 41 | 31 | 19 | 40 |
| Avg Max Temp (°F) | 30 | 36 | 48 | 62 | 73 | 83 | 85 | 83 | 77 | 65 | 49 | 35 | 61 |
| Avg Precip (In.) | 1.8 | 1.75 | 2.88 | 3.65 | 3.83 | 4.24 | 4.19 | 3.64 | 3.25 | 2.77 | 3.13 | 2.54 | 37.65 |