Anna, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.1 °C (low) to 15.8 °C (high). Annual precipitation averages 1060.2 Millimeters. Anna is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.6 °C | 0.9 °C | 74.68 mm |
| February | -6.5 °C | 2.9 °C | 61.47 mm |
| March | -1.8 °C | 8.7 °C | 83.06 mm |
| April | 3.9 °C | 16 °C | 105.16 mm |
| May | 10.3 °C | 21.8 °C | 108.97 mm |
| June | 15.6 °C | 26.7 °C | 116.33 mm |
| July | 17.1 °C | 28.4 °C | 116.33 mm |
| August | 16.1 °C | 27.8 °C | 82.8 mm |
| September | 12 °C | 24.8 °C | 80.01 mm |
| October | 5.8 °C | 17.8 °C | 72.14 mm |
| November | 0.2 °C | 10 °C | 80.52 mm |
| December | -4.4 °C | 3.6 °C | 78.74 mm |
| Annual | 5.1 °C | 15.8 °C | 1060.21 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°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 |