Batavia, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.6 °C (low) to 12.9 °C (high). Annual precipitation averages 418.6 Millimeters. Batavia is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.7 °C | -0.2 °C | 33.53 mm |
| February | -8.3 °C | 2.2 °C | 26.42 mm |
| March | -5 °C | 7.1 °C | 28.19 mm |
| April | -1.4 °C | 12.6 °C | 33.78 mm |
| May | 2.9 °C | 18.2 °C | 43.18 mm |
| June | 6.4 °C | 21.7 °C | 65.28 mm |
| July | 8.7 °C | 27.9 °C | 27.69 mm |
| August | 7.7 °C | 27.7 °C | 22.61 mm |
| September | 3.8 °C | 21.5 °C | 30.23 mm |
| October | -1.1 °C | 12.6 °C | 35.81 mm |
| November | -4.6 °C | 4.3 °C | 37.08 mm |
| December | -7.9 °C | -0.5 °C | 34.8 mm |
| Annual | -0.6 °C | 12.9 °C | 418.6 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |