| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 2012 Hardiness Zone: | Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | Apr. 21 - Apr. 30 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 47f - Rolling Loess Prairies |
| Heat Zone Days: | 46 - 60 days Over 86°F |
Annual Climate Data for ZIP Code 64506 - Saint Joseph, MO | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 15 | 20 | 31 | 41 | 52 | 62 | 66 | 63 | 54 | 43 | 31 | 20 | 42 |
| Avg Max Temp (°F) | 36 | 42 | 54 | 65 | 75 | 84 | 89 | 87 | 80 | 68 | 52 | 39 | 64 |
| Avg Precip (In.) | .97 | 1.14 | 2.48 | 3.25 | 5 | 4.39 | 4.31 | 3.87 | 4.25 | 3.09 | 2.26 | 1.42 | 36.43 |