Crellin, Maryland has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 37.4 °F (low) to 58.7 °F (high). Annual precipitation averages 52.4 Inches. Crellin is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 18.0 °F | 35.4 °F | 4.08 in. |
| February | 19.6 °F | 39.0 °F | 3.89 in. |
| March | 25.6 °F | 47.0 °F | 4.44 in. |
| April | 35.2 °F | 60.0 °F | 4.52 in. |
| May | 45.3 °F | 68.3 °F | 5.4 in. |
| June | 53.7 °F | 75.5 °F | 5.23 in. |
| July | 57.5 °F | 79.0 °F | 5.37 in. |
| August | 55.9 °F | 77.9 °F | 4.24 in. |
| September | 48.8 °F | 72.4 °F | 4.07 in. |
| October | 37.9 °F | 61.3 °F | 3.53 in. |
| November | 28.8 °F | 49.4 °F | 3.44 in. |
| December | 22.5 °F | 39.7 °F | 4.17 in. |
| Annual | 37.4 °F | 58.7 °F | 52.38 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |