High Ridge, Missouri has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.3 °C (low) to 19.3 °C (high). Annual precipitation averages 1128.8 Millimeters. High Ridge is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.2 °C | 5.8 °C | 71.12 mm |
| February | -2.3 °C | 8.2 °C | 62.23 mm |
| March | 2.1 °C | 13.9 °C | 94.49 mm |
| April | 7.6 °C | 19.9 °C | 123.19 mm |
| May | 13.3 °C | 24.8 °C | 134.37 mm |
| June | 18 °C | 29.3 °C | 114.81 mm |
| July | 20.3 °C | 31.3 °C | 103.12 mm |
| August | 19 °C | 30.6 °C | 91.95 mm |
| September | 15.4 °C | 27.2 °C | 87.63 mm |
| October | 8.6 °C | 20.7 °C | 84.33 mm |
| November | 3.1 °C | 12.8 °C | 91.19 mm |
| December | -1.4 °C | 7.3 °C | 70.36 mm |
| Annual | 8.3 °C | 19.3 °C | 1128.79 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |