Meridian, 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 15.7 °C (high). Annual precipitation averages 1084.8 Millimeters. Meridian 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 | -7.3 °C | 1.8 °C | 84.33 mm |
| February | -6.7 °C | 3.6 °C | 64.01 mm |
| March | -2.9 °C | 8.6 °C | 82.3 mm |
| April | 2.9 °C | 16 °C | 95 mm |
| May | 8.7 °C | 21.7 °C | 96.77 mm |
| June | 13.6 °C | 26.1 °C | 109.98 mm |
| July | 15.7 °C | 28 °C | 107.44 mm |
| August | 14.7 °C | 27.3 °C | 99.06 mm |
| September | 10.9 °C | 23.8 °C | 98.3 mm |
| October | 4.8 °C | 16.9 °C | 81.79 mm |
| November | 0 °C | 10.4 °C | 84.58 mm |
| December | -4.1 °C | 4.4 °C | 81.28 mm |
| Annual | 4.2 °C | 15.7 °C | 1084.84 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 |