Folsom, New Jersey has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 44.6 °F (low) to 64.8 °F (high). Annual precipitation averages 47.9 Inches. Folsom is located in USDA Plant Hardiness Zone 7a. 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 | 24.1 °F | 42.2 °F | 3.66 in. |
| February | 25.3 °F | 44.5 °F | 2.91 in. |
| March | 32.2 °F | 51.8 °F | 4.56 in. |
| April | 41.9 °F | 63.6 °F | 3.49 in. |
| May | 51.6 °F | 73.0 °F | 3.53 in. |
| June | 61.1 °F | 82.1 °F | 4.18 in. |
| July | 66.3 °F | 86.5 °F | 4.87 in. |
| August | 64.4 °F | 84.7 °F | 4.86 in. |
| September | 57.8 °F | 78.5 °F | 4.15 in. |
| October | 45.5 °F | 66.8 °F | 4.07 in. |
| November | 35.7 °F | 56.4 °F | 3.31 in. |
| December | 29.0 °F | 47.0 °F | 4.34 in. |
| Annual | 44.6 °F | 64.8 °F | 47.93 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |