Gerster, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 45.3 °F (low) to 67.3 °F (high). Annual precipitation averages 44.4 Inches. Gerster is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 21.6 °F | 42.2 °F | 1.97 in. |
| February | 25.2 °F | 47.4 °F | 2.06 in. |
| March | 34.5 °F | 57.5 °F | 3.04 in. |
| April | 44.0 °F | 68.0 °F | 4.84 in. |
| May | 54.6 °F | 76.1 °F | 5.76 in. |
| June | 64.0 °F | 84.5 °F | 4.82 in. |
| July | 68.1 °F | 89.3 °F | 4.33 in. |
| August | 66.2 °F | 88.6 °F | 3.92 in. |
| September | 57.7 °F | 80.9 °F | 4.35 in. |
| October | 45.6 °F | 69.9 °F | 3.57 in. |
| November | 35.3 °F | 56.8 °F | 3.28 in. |
| December | 26.3 °F | 45.8 °F | 2.49 in. |
| Annual | 45.3 °F | 67.3 °F | 44.43 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |