Grand Pass, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43.2 °F (low) to 64.5 °F (high). Annual precipitation averages 39.7 Inches. Grand Pass 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 18.1 °F | 37.3 °F | 1.41 in. |
| February | 22.4 °F | 42.7 °F | 1.82 in. |
| March | 32.2 °F | 54.2 °F | 2.65 in. |
| April | 42.3 °F | 65.4 °F | 4.02 in. |
| May | 53.5 °F | 74.8 °F | 5.03 in. |
| June | 63.3 °F | 83.7 °F | 4.92 in. |
| July | 67.2 °F | 87.6 °F | 4.46 in. |
| August | 64.6 °F | 86.4 °F | 4.15 in. |
| September | 55.4 °F | 79.4 °F | 3.98 in. |
| October | 43.8 °F | 67.7 °F | 3.21 in. |
| November | 32.5 °F | 53.7 °F | 2.3 in. |
| December | 23.2 °F | 41.5 °F | 1.71 in. |
| Annual | 43.2 °F | 64.5 °F | 39.66 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°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 |