Diehlstadt, Missouri has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 48.1 °F (low) to 68.4 °F (high). Annual precipitation averages 50.2 Inches. Diehlstadt 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 Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 26.9 °F | 43.2 °F | 3.73 in. |
| February | 29.6 °F | 48.3 °F | 3.94 in. |
| March | 37.8 °F | 58.0 °F | 4.66 in. |
| April | 47.5 °F | 69.3 °F | 5.29 in. |
| May | 58.0 °F | 78.4 °F | 5.51 in. |
| June | 66.3 °F | 86.8 °F | 3.97 in. |
| July | 69.8 °F | 89.7 °F | 4.3 in. |
| August | 67.3 °F | 88.6 °F | 2.8 in. |
| September | 59.1 °F | 82.8 °F | 3.2 in. |
| October | 47.3 °F | 71.7 °F | 3.92 in. |
| November | 37.4 °F | 57.7 °F | 4.34 in. |
| December | 30.1 °F | 46.6 °F | 4.49 in. |
| Annual | 48.1 °F | 68.4 °F | 50.15 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 75-100 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 | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |