Crestline, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.2 °F (low) to 59.7 °F (high). Annual precipitation averages 41.7 Inches. Crestline 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 | 17.8 °F | 33.3 °F | 3.15 in. |
| February | 19.2 °F | 36.1 °F | 2.21 in. |
| March | 27.4 °F | 46.1 °F | 2.89 in. |
| April | 38.0 °F | 59.9 °F | 4.01 in. |
| May | 49.2 °F | 71.1 °F | 4.38 in. |
| June | 58.4 °F | 79.5 °F | 4.72 in. |
| July | 61.6 °F | 82.9 °F | 4.29 in. |
| August | 59.9 °F | 81.3 °F | 3.59 in. |
| September | 53.0 °F | 75.4 °F | 3.34 in. |
| October | 41.9 °F | 62.8 °F | 3.03 in. |
| November | 32.0 °F | 49.3 °F | 3.07 in. |
| December | 23.8 °F | 38.3 °F | 3.02 in. |
| Annual | 40.2 °F | 59.7 °F | 41.7 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°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 |