Silesia, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.6 °C (low) to 16.2 °C (high). Annual precipitation averages 339.9 Millimeters. Silesia is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.8 °C | 3.1 °C | 11.18 mm |
| February | -8.7 °C | 4.9 °C | 12.7 mm |
| March | -4.5 °C | 10.7 °C | 18.8 mm |
| April | -0.2 °C | 15.1 °C | 45.47 mm |
| May | 4.9 °C | 20.2 °C | 62.23 mm |
| June | 9.5 °C | 25.6 °C | 50.8 mm |
| July | 12.7 °C | 31.2 °C | 26.67 mm |
| August | 11.4 °C | 30.5 °C | 19.56 mm |
| September | 6.5 °C | 24.6 °C | 30.73 mm |
| October | 0.4 °C | 16.2 °C | 33.02 mm |
| November | -4.9 °C | 8.7 °C | 14.73 mm |
| December | -9.6 °C | 3.1 °C | 13.97 mm |
| Annual | 0.6 °C | 16.2 °C | 339.86 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |