Morrison, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 44.1 °F (low) to 65.7 °F (high). Annual precipitation averages 43.8 Inches. Morrison is located in USDA Plant Hardiness Zone 6b. 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 | 21.1 °F | 40.0 °F | 2.37 in. |
| February | 24.1 °F | 45.0 °F | 2.27 in. |
| March | 33.0 °F | 55.4 °F | 3.24 in. |
| April | 43.5 °F | 66.9 °F | 4.66 in. |
| May | 54.3 °F | 75.3 °F | 5.21 in. |
| June | 63.1 °F | 83.2 °F | 4.59 in. |
| July | 67.3 °F | 87.6 °F | 4.33 in. |
| August | 64.8 °F | 86.7 °F | 3.91 in. |
| September | 56.1 °F | 80.2 °F | 4.03 in. |
| October | 44.2 °F | 68.5 °F | 3.34 in. |
| November | 33.3 °F | 55.7 °F | 3.3 in. |
| December | 24.5 °F | 44.1 °F | 2.55 in. |
| Annual | 44.1 °F | 65.7 °F | 43.8 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |