| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F | |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F Zone 5b: -15°F to -10°F | |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F | |
| Average First Frost Date: | October 21 - 31 | |
| Average Last Frost Date: | April 11 - 20 | |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers | |
| Ecoregion: | 39d - Central Plateau | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 61 - 90 days Over 86°F |
Annual Climate Data for ZIP Code 65401 - Rolla, MO | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 20 | 24 | 34 | 44 | 54 | 63 | 68 | 65 | 57 | 46 | 35 | 24 | 44 |
| Avg Max Temp (°F) | 39 | 45 | 56 | 67 | 75 | 83 | 89 | 88 | 79 | 69 | 55 | 43 | 66 |
| Avg Precip (In.) | 2.15 | 2.3 | 3.71 | 4.12 | 4.79 | 3.96 | 4.23 | 3.84 | 3.73 | 3.48 | 4.28 | 3.12 | 43.71 |