Geistown, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.3 °C (low) to 14.4 °C (high). Annual precipitation averages 1215.9 Millimeters. Geistown is located in USDA Plant Hardiness Zone 6b. 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 | -7.4 °C | 0.8 °C | 84.33 mm |
| February | -6.7 °C | 2.4 °C | 81.53 mm |
| March | -3.1 °C | 7.2 °C | 100.08 mm |
| April | 3.2 °C | 14.8 °C | 104.14 mm |
| May | 8.9 °C | 20.3 °C | 110.74 mm |
| June | 13.6 °C | 24.4 °C | 120.14 mm |
| July | 15.7 °C | 26.7 °C | 116.84 mm |
| August | 14.9 °C | 25.8 °C | 117.09 mm |
| September | 11.3 °C | 22.3 °C | 106.68 mm |
| October | 5.3 °C | 15.8 °C | 91.95 mm |
| November | -0.3 °C | 9.1 °C | 87.88 mm |
| December | -4.4 °C | 3.3 °C | 94.49 mm |
| Annual | 4.3 °C | 14.4 °C | 1215.89 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 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |