Chester, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 48.4 °F (low) to 64.2 °F (high). Annual precipitation averages 45.7 Inches. Chester is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 27.2 °F | 40.9 °F | 3.54 in. |
| February | 28.4 °F | 43.4 °F | 2.85 in. |
| March | 35.1 °F | 51.2 °F | 4.28 in. |
| April | 45.5 °F | 63.3 °F | 3.54 in. |
| May | 55.4 °F | 72.7 °F | 3.65 in. |
| June | 64.9 °F | 82.0 °F | 4.39 in. |
| July | 70.3 °F | 86.3 °F | 4.61 in. |
| August | 68.7 °F | 84.7 °F | 4.35 in. |
| September | 61.9 °F | 78.3 °F | 4.07 in. |
| October | 50.2 °F | 66.4 °F | 3.66 in. |
| November | 40.0 °F | 55.6 °F | 2.86 in. |
| December | 32.6 °F | 45.9 °F | 3.89 in. |
| Annual | 48.4 °F | 64.2 °F | 45.69 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |