Pontiac, Michigan has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4 °C (low) to 14.1 °C (high). Annual precipitation averages 851.7 Millimeters. Pontiac is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.9 °C | -0.9 °C | 57.66 mm |
| February | -8.4 °C | 0.8 °C | 48.51 mm |
| March | -3.8 °C | 6.3 °C | 56.9 mm |
| April | 2.3 °C | 13.6 °C | 75.44 mm |
| May | 8.6 °C | 20.3 °C | 97.79 mm |
| June | 14.1 °C | 25.6 °C | 82.8 mm |
| July | 16.3 °C | 27.8 °C | 81.03 mm |
| August | 15.7 °C | 26.8 °C | 82.55 mm |
| September | 11.7 °C | 23.2 °C | 75.95 mm |
| October | 5.4 °C | 15.7 °C | 73.41 mm |
| November | -0.2 °C | 8.4 °C | 61.98 mm |
| December | -5.2 °C | 1.8 °C | 57.66 mm |
| Annual | 4 °C | 14.1 °C | 851.68 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°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 |