Pontiac, Missouri has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 46.7 °F (low) to 69.9 °F (high). Annual precipitation averages 46.3 Inches. Pontiac 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 | 26.2 °F | 46.9 °F | 2.98 in. |
| February | 29.2 °F | 51.8 °F | 2.89 in. |
| March | 36.6 °F | 60.6 °F | 4.45 in. |
| April | 45.7 °F | 71.2 °F | 5.19 in. |
| May | 55.1 °F | 77.7 °F | 4.99 in. |
| June | 64.0 °F | 86.1 °F | 3.86 in. |
| July | 67.5 °F | 90.3 °F | 3.67 in. |
| August | 65.6 °F | 89.8 °F | 3.25 in. |
| September | 57.9 °F | 82.8 °F | 3.7 in. |
| October | 46.5 °F | 72.2 °F | 3.67 in. |
| November | 37.0 °F | 60.0 °F | 4.32 in. |
| December | 29.1 °F | 49.5 °F | 3.37 in. |
| Annual | 46.7 °F | 69.9 °F | 46.34 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 | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |