Rahway, New Jersey has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 45.8 °F (low) to 64.2 °F (high). Annual precipitation averages 48.3 Inches. Rahway is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 24.7 °F | 40.4 °F | 3.5 in. |
| February | 26.1 °F | 43.1 °F | 2.84 in. |
| March | 32.8 °F | 51.2 °F | 4.15 in. |
| April | 42.9 °F | 63.3 °F | 3.87 in. |
| May | 52.6 °F | 73.0 °F | 3.96 in. |
| June | 62.0 °F | 82.0 °F | 4.56 in. |
| July | 67.7 °F | 87.0 °F | 4.98 in. |
| August | 66.1 °F | 85.1 °F | 4.5 in. |
| September | 59.2 °F | 78.4 °F | 4.21 in. |
| October | 47.4 °F | 66.5 °F | 4.31 in. |
| November | 37.7 °F | 55.5 °F | 3.35 in. |
| December | 30.3 °F | 45.4 °F | 4.08 in. |
| Annual | 45.8 °F | 64.2 °F | 48.31 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°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 |