Miller, Missouri has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.8 °C (low) to 19.5 °C (high). Annual precipitation averages 1176.8 Millimeters. Miller 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 | -4.7 °C | 6.2 °C | 61.72 mm |
| February | -2.9 °C | 8.7 °C | 53.85 mm |
| March | 1.9 °C | 14.1 °C | 92.71 mm |
| April | 7.2 °C | 19.3 °C | 123.19 mm |
| May | 12.7 °C | 23.9 °C | 155.19 mm |
| June | 17.7 °C | 28.8 °C | 127 mm |
| July | 19.9 °C | 31.4 °C | 100.08 mm |
| August | 19.1 °C | 31.4 °C | 88.39 mm |
| September | 14.6 °C | 27.2 °C | 113.79 mm |
| October | 8.1 °C | 20.9 °C | 93.73 mm |
| November | 2.1 °C | 13.8 °C | 93.22 mm |
| December | -2.7 °C | 8.1 °C | 73.91 mm |
| Annual | 7.8 °C | 19.5 °C | 1176.78 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 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |