Gerster, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.4 °C (low) to 19.6 °C (high). Annual precipitation averages 1128.5 Millimeters. 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 | -5.8 °C | 5.7 °C | 50.04 mm |
| February | -3.8 °C | 8.6 °C | 52.32 mm |
| March | 1.4 °C | 14.2 °C | 77.22 mm |
| April | 6.7 °C | 20 °C | 122.94 mm |
| May | 12.6 °C | 24.5 °C | 146.3 mm |
| June | 17.8 °C | 29.2 °C | 122.43 mm |
| July | 20.1 °C | 31.8 °C | 109.98 mm |
| August | 19 °C | 31.4 °C | 99.57 mm |
| September | 14.3 °C | 27.2 °C | 110.49 mm |
| October | 7.6 °C | 21.1 °C | 90.68 mm |
| November | 1.8 °C | 13.8 °C | 83.31 mm |
| December | -3.2 °C | 7.7 °C | 63.25 mm |
| Annual | 7.4 °C | 19.6 °C | 1128.53 mm |
| 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 : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |