Flemington, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 39.8 °F (low) to 61.3 °F (high). Annual precipitation averages 41.1 Inches. Flemington is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 18.8 °F | 35.2 °F | 2.79 in. |
| February | 19.7 °F | 38.6 °F | 2.16 in. |
| March | 27.0 °F | 48.1 °F | 3.04 in. |
| April | 37.2 °F | 62.1 °F | 3.57 in. |
| May | 47.7 °F | 73.0 °F | 3.84 in. |
| June | 56.9 °F | 80.6 °F | 3.74 in. |
| July | 61.3 °F | 85.1 °F | 4.25 in. |
| August | 59.7 °F | 83.0 °F | 4.12 in. |
| September | 52.4 °F | 75.6 °F | 4.23 in. |
| October | 41.1 °F | 63.8 °F | 3.52 in. |
| November | 31.5 °F | 50.7 °F | 2.93 in. |
| December | 24.6 °F | 39.6 °F | 2.95 in. |
| Annual | 39.8 °F | 61.3 °F | 41.14 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |