Morrison, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.5 °C (low) to 22 °C (high). Annual precipitation averages 945.6 Millimeters. Morrison 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 | -4.3 °C | 9.3 °C | 33.02 mm |
| February | -2.4 °C | 11.4 °C | 38.35 mm |
| March | 2.7 °C | 16.9 °C | 69.34 mm |
| April | 7.7 °C | 21.9 °C | 100.84 mm |
| May | 13.7 °C | 26.2 °C | 129.29 mm |
| June | 19.1 °C | 31.1 °C | 119.38 mm |
| July | 21.3 °C | 34.1 °C | 91.95 mm |
| August | 20.3 °C | 33.9 °C | 87.88 mm |
| September | 15.7 °C | 29.7 °C | 92.96 mm |
| October | 8.8 °C | 23.3 °C | 89.66 mm |
| November | 2.3 °C | 16.4 °C | 51.05 mm |
| December | -2.8 °C | 10.1 °C | 41.91 mm |
| Annual | 8.5 °C | 22 °C | 945.63 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 7a : -17.8°C to -15°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |