| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| 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: | 55c - Mad River Interlobate Area |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 45503 - Springfield, OH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 18 | 20 | 29 | 38 | 49 | 59 | 63 | 60 | 53 | 41 | 33 | 24 | 41 |
| Avg Max Temp (°F) | 34 | 38 | 49 | 61 | 72 | 80 | 84 | 82 | 76 | 64 | 50 | 39 | 61 |
| Avg Precip (In.) | 2.38 | 1.98 | 2.68 | 3.49 | 4.27 | 4.37 | 4.13 | 3.86 | 3 | 2.69 | 3.12 | 2.78 | 38.74 |