Bertrand, Missouri has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 48.2 °F (low) to 68.6 °F (high). Annual precipitation averages 50.2 Inches. Bertrand is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 27.1 °F | 43.4 °F | 3.72 in. |
| February | 29.8 °F | 48.4 °F | 3.95 in. |
| March | 37.9 °F | 58.3 °F | 4.66 in. |
| April | 47.7 °F | 69.4 °F | 5.28 in. |
| May | 58.3 °F | 78.6 °F | 5.49 in. |
| June | 66.4 °F | 87.0 °F | 3.95 in. |
| July | 69.8 °F | 89.8 °F | 4.29 in. |
| August | 67.4 °F | 88.8 °F | 2.83 in. |
| September | 59.2 °F | 83.0 °F | 3.24 in. |
| October | 47.3 °F | 71.8 °F | 3.93 in. |
| November | 37.4 °F | 57.8 °F | 4.33 in. |
| December | 30.2 °F | 46.8 °F | 4.51 in. |
| Annual | 48.2 °F | 68.6 °F | 50.18 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |