Annapolis, Missouri has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 6.3 °C (low) to 20 °C (high). Annual precipitation averages 1210.8 Millimeters. Annapolis 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 | -5.6 °C | 6.5 °C | 73.66 mm |
| February | -4.2 °C | 9.4 °C | 77.47 mm |
| March | 0.6 °C | 15 °C | 101.6 mm |
| April | 5.8 °C | 21.4 °C | 146.56 mm |
| May | 11.5 °C | 25.1 °C | 139.45 mm |
| June | 15.9 °C | 29.3 °C | 107.19 mm |
| July | 18.6 °C | 31.2 °C | 97.79 mm |
| August | 17.3 °C | 31.1 °C | 85.09 mm |
| September | 12.8 °C | 27.4 °C | 96.52 mm |
| October | 5.8 °C | 21.2 °C | 87.38 mm |
| November | 0.3 °C | 14.1 °C | 108.46 mm |
| December | -3.8 °C | 8.1 °C | 89.66 mm |
| Annual | 6.3 °C | 20 °C | 1210.83 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 | Cfa - Humid Subtropical Climate |