| 2023 Hardiness Zone: | Zone 8b: 15°F to 20°F |
| 2012 Hardiness Zone: | Zone 8b: 15°F to 20°F |
| 1990 Hardiness Zone: | Zone 8a: 10F to 15F |
| Average First Frost Date: | Nov. 11 - Nov. 20 |
| Average Last Frost Date: | Mar. 21 - Mar. 31 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 74c - Southern Rolling Plains |
| Heat Zone Days: | 91 - 120 days Over 86°F |
Annual Climate Data for ZIP Code 39666 - Summit, MS | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 37 | 40 | 47 | 53 | 61 | 67 | 70 | 70 | 65 | 54 | 45 | 39 | 54 |
| Avg Max Temp (°F) | 59 | 63 | 71 | 77 | 84 | 90 | 92 | 92 | 87 | 79 | 69 | 61 | 77 |
| Avg Precip (In.) | 6.57 | 5.46 | 6.49 | 5.88 | 5.52 | 4.8 | 5.31 | 4.95 | 4.47 | 3.5 | 5.05 | 5.79 | 63.8 |