Silesia, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 33.2 °F (low) to 61.1 °F (high). Annual precipitation averages 13.4 Inches. 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 | 14.3 °F | 37.5 °F | 0.44 in. |
| February | 16.3 °F | 40.8 °F | 0.5 in. |
| March | 23.9 °F | 51.2 °F | 0.74 in. |
| April | 31.7 °F | 59.1 °F | 1.79 in. |
| May | 40.9 °F | 68.4 °F | 2.45 in. |
| June | 49.1 °F | 78.1 °F | 2.0 in. |
| July | 54.9 °F | 88.1 °F | 1.05 in. |
| August | 52.5 °F | 86.9 °F | 0.77 in. |
| September | 43.7 °F | 76.2 °F | 1.21 in. |
| October | 32.8 °F | 61.1 °F | 1.3 in. |
| November | 23.2 °F | 47.7 °F | 0.58 in. |
| December | 14.7 °F | 37.6 °F | 0.55 in. |
| Annual | 33.2 °F | 61.1 °F | 13.38 in. |
| 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 : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |