Rolla, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.3 °C (low) to 19.1 °C (high). Annual precipitation averages 1185.9 Millimeters. Rolla is located in USDA Plant Hardiness Zone 6b. 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 | -5.5 °C | 5.1 °C | 68.33 mm |
| February | -3.4 °C | 8.1 °C | 63.75 mm |
| March | 1.1 °C | 13.5 °C | 102.87 mm |
| April | 6.9 °C | 19.7 °C | 123.44 mm |
| May | 12.4 °C | 24.3 °C | 138.68 mm |
| June | 17.4 °C | 28.7 °C | 111.51 mm |
| July | 19.5 °C | 31.3 °C | 115.57 mm |
| August | 18.6 °C | 31 °C | 107.7 mm |
| September | 14 °C | 26.8 °C | 102.36 mm |
| October | 7.6 °C | 20.6 °C | 82.3 mm |
| November | 1.8 °C | 13.2 °C | 98.55 mm |
| December | -3.2 °C | 7.2 °C | 70.87 mm |
| Annual | 7.3 °C | 19.1 °C | 1185.93 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 6b : -20.6°C to -17.8°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 |