Clymer, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.2 °C (low) to 15.5 °C (high). Annual precipitation averages 1246.1 Millimeters. Clymer is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.2 °C | 1.8 °C | 100.84 mm |
| February | -6.7 °C | 3.4 °C | 78.23 mm |
| March | -2.9 °C | 8.4 °C | 99.31 mm |
| April | 2.8 °C | 15.9 °C | 106.43 mm |
| May | 8.7 °C | 21.5 °C | 106.43 mm |
| June | 13.5 °C | 25.6 °C | 123.44 mm |
| July | 15.7 °C | 27.7 °C | 127.51 mm |
| August | 15 °C | 27 °C | 112.01 mm |
| September | 11.3 °C | 23.5 °C | 109.73 mm |
| October | 5.1 °C | 16.9 °C | 87.38 mm |
| November | -0.3 °C | 10.2 °C | 96.52 mm |
| December | -4.2 °C | 4.2 °C | 98.3 mm |
| Annual | 4.2 °C | 15.5 °C | 1246.13 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°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 |