Monroeville, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.8 °F (low) to 61.7 °F (high). Annual precipitation averages 42.2 Inches. Monroeville 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 | 20.7 °F | 36.8 °F | 3.28 in. |
| February | 21.9 °F | 39.9 °F | 2.5 in. |
| March | 29.1 °F | 49.1 °F | 3.35 in. |
| April | 39.5 °F | 62.5 °F | 3.43 in. |
| May | 50.3 °F | 72.3 °F | 3.9 in. |
| June | 58.7 °F | 80.2 °F | 4.43 in. |
| July | 62.9 °F | 83.6 °F | 4.47 in. |
| August | 61.2 °F | 82.5 °F | 3.84 in. |
| September | 54.3 °F | 76.1 °F | 3.6 in. |
| October | 43.2 °F | 64.0 °F | 3.17 in. |
| November | 33.5 °F | 51.7 °F | 3.02 in. |
| December | 26.2 °F | 41.2 °F | 3.19 in. |
| Annual | 41.8 °F | 61.7 °F | 42.18 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |