| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| Average First Frost Date: | Oct. 21 - Oct. 31 |
| Average Last Frost Date: | Apr. 1 - Apr. 10 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 39e - Osage/Gasconade Hills |
| Heat Zone Days: | 61 - 90 days Over 86°F |
Annual Climate Data for ZIP Code 65584 - Saint Robert, MO | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 19 | 24 | 33 | 43 | 52 | 61 | 66 | 64 | 56 | 44 | 34 | 24 | 43 |
| Avg Max Temp (°F) | 42 | 48 | 58 | 68 | 76 | 83 | 89 | 88 | 80 | 71 | 57 | 46 | 67 |
| Avg Precip (In.) | 2.16 | 2.38 | 3.88 | 4.05 | 4.75 | 4.13 | 3.8 | 3.5 | 3.99 | 3.78 | 4.31 | 3.19 | 43.93 |