Haviland, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.6 °C (low) to 15.6 °C (high). Annual precipitation averages 965.5 Millimeters. Haviland 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 | -8.2 °C | 0.1 °C | 61.21 mm |
| February | -7.2 °C | 2 °C | 54.36 mm |
| March | -2.4 °C | 8.1 °C | 65.28 mm |
| April | 3.2 °C | 15.7 °C | 91.95 mm |
| May | 9.7 °C | 22.1 °C | 114.05 mm |
| June | 15.3 °C | 27.1 °C | 106.43 mm |
| July | 17.1 °C | 29.1 °C | 101.85 mm |
| August | 15.8 °C | 28 °C | 90.68 mm |
| September | 11.7 °C | 24.9 °C | 77.98 mm |
| October | 5.6 °C | 17.7 °C | 69.85 mm |
| November | -0.1 °C | 9.6 °C | 72.39 mm |
| December | -4.9 °C | 2.9 °C | 59.44 mm |
| Annual | 4.6 °C | 15.6 °C | 965.47 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 |