Summit, New Jersey has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.5 °F (low) to 62.5 °F (high). Annual precipitation averages 49.3 Inches. Summit is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 21.4 °F | 38.5 °F | 3.64 in. |
| February | 22.6 °F | 41.2 °F | 2.86 in. |
| March | 29.7 °F | 49.5 °F | 4.25 in. |
| April | 40.2 °F | 61.6 °F | 4.03 in. |
| May | 49.7 °F | 71.5 °F | 4.1 in. |
| June | 59.2 °F | 80.4 °F | 4.67 in. |
| July | 64.3 °F | 85.4 °F | 4.6 in. |
| August | 62.6 °F | 83.6 °F | 4.53 in. |
| September | 55.5 °F | 76.8 °F | 4.38 in. |
| October | 43.6 °F | 64.8 °F | 4.43 in. |
| November | 34.1 °F | 53.6 °F | 3.52 in. |
| December | 26.9 °F | 43.5 °F | 4.25 in. |
| Annual | 42.5 °F | 62.5 °F | 49.26 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |