Passaic, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.1 °C (low) to 19.1 °C (high). Annual precipitation averages 1114.8 Millimeters. Passaic is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.3 °C | 4.8 °C | 40.64 mm |
| February | -4.2 °C | 7.6 °C | 51.31 mm |
| March | 0.9 °C | 13.5 °C | 73.15 mm |
| April | 6.5 °C | 19.3 °C | 116.59 mm |
| May | 12.6 °C | 24.2 °C | 155.96 mm |
| June | 17.9 °C | 29.2 °C | 140.72 mm |
| July | 20.3 °C | 31.8 °C | 115.82 mm |
| August | 19 °C | 31.2 °C | 98.04 mm |
| September | 14.2 °C | 27.2 °C | 108.97 mm |
| October | 7.4 °C | 20.8 °C | 89.41 mm |
| November | 1.3 °C | 13.2 °C | 70.61 mm |
| December | -3.9 °C | 6.9 °C | 53.59 mm |
| Annual | 7.1 °C | 19.1 °C | 1114.81 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |