Maryland Heights, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 8.3 °C (low) to 19 °C (high). Annual precipitation averages 1095.5 Millimeters. Maryland Heights is located in USDA Plant Hardiness Zone 7a. 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 | -4.9 °C | 4.2 °C | 66.8 mm |
| February | -3 °C | 7.4 °C | 56.64 mm |
| March | 1.8 °C | 13 °C | 89.15 mm |
| April | 7.8 °C | 19.6 °C | 120.65 mm |
| May | 13.8 °C | 24.6 °C | 129.29 mm |
| June | 18.8 °C | 29.4 °C | 116.08 mm |
| July | 21 °C | 31.4 °C | 100.58 mm |
| August | 19.9 °C | 30.7 °C | 91.19 mm |
| September | 15.3 °C | 27.1 °C | 81.28 mm |
| October | 8.8 °C | 20.6 °C | 85.09 mm |
| November | 2.4 °C | 12.9 °C | 89.41 mm |
| December | -2.4 °C | 6.8 °C | 69.34 mm |
| Annual | 8.3 °C | 19 °C | 1095.5 mm |
| 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 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |