Graham, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.7 °F (low) to 63.4 °F (high). Annual precipitation averages 38.1 Inches. Graham is located in USDA Plant Hardiness Zone 6a. 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 | 15.8 °F | 35.1 °F | 0.84 in. |
| February | 19.8 °F | 40.6 °F | 1.25 in. |
| March | 30.0 °F | 52.7 °F | 2.48 in. |
| April | 40.8 °F | 64.2 °F | 3.54 in. |
| May | 53.0 °F | 74.4 °F | 5.16 in. |
| June | 62.9 °F | 83.4 °F | 5.22 in. |
| July | 66.6 °F | 87.1 °F | 5.41 in. |
| August | 64.0 °F | 85.7 °F | 3.98 in. |
| September | 54.8 °F | 79.2 °F | 3.55 in. |
| October | 42.3 °F | 67.0 °F | 3.22 in. |
| November | 30.5 °F | 52.3 °F | 2.0 in. |
| December | 20.2 °F | 39.4 °F | 1.42 in. |
| Annual | 41.7 °F | 63.4 °F | 38.07 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |