Caln, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.2 °F (low) to 63.3 °F (high). Annual precipitation averages 50.7 Inches. Caln is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 21.4 °F | 39.6 °F | 3.7 in. |
| February | 22.0 °F | 41.7 °F | 3.01 in. |
| March | 29.5 °F | 50.4 °F | 4.33 in. |
| April | 40.0 °F | 63.0 °F | 3.9 in. |
| May | 49.9 °F | 72.6 °F | 4.01 in. |
| June | 58.8 °F | 81.1 °F | 4.78 in. |
| July | 64.3 °F | 85.5 °F | 4.9 in. |
| August | 62.4 °F | 84.3 °F | 4.5 in. |
| September | 54.8 °F | 77.8 °F | 5.05 in. |
| October | 43.0 °F | 65.9 °F | 4.68 in. |
| November | 33.2 °F | 54.1 °F | 3.47 in. |
| December | 26.6 °F | 43.9 °F | 4.35 in. |
| Annual | 42.2 °F | 63.3 °F | 50.68 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |