Polo, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.3 °F (low) to 63.3 °F (high). Annual precipitation averages 40.3 Inches. Polo 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 | 16.7 °F | 35.6 °F | 1.24 in. |
| February | 20.7 °F | 41.0 °F | 1.59 in. |
| March | 30.9 °F | 52.7 °F | 2.67 in. |
| April | 41.0 °F | 63.6 °F | 3.89 in. |
| May | 52.6 °F | 73.0 °F | 5.52 in. |
| June | 62.3 °F | 82.9 °F | 5.14 in. |
| July | 66.3 °F | 87.2 °F | 4.35 in. |
| August | 64.4 °F | 86.1 °F | 4.62 in. |
| September | 55.2 °F | 78.4 °F | 4.24 in. |
| October | 43.6 °F | 66.4 °F | 3.14 in. |
| November | 31.8 °F | 52.2 °F | 2.19 in. |
| December | 22.1 °F | 40.0 °F | 1.72 in. |
| Annual | 42.3 °F | 63.3 °F | 40.31 in. |
| 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 : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |