Weston, Idaho has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.6 °C (low) to 15.3 °C (high). Annual precipitation averages 410.5 Millimeters. Weston is located in USDA Plant Hardiness Zone 6a. 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 | 0.2 °C | 45.97 mm |
| February | -7.8 °C | 2.9 °C | 31.75 mm |
| March | -2.9 °C | 9.4 °C | 38.61 mm |
| April | 0.2 °C | 14.2 °C | 46.99 mm |
| May | 4 °C | 19.4 °C | 56.64 mm |
| June | 7.4 °C | 25.4 °C | 29.97 mm |
| July | 11.7 °C | 31.2 °C | 13.46 mm |
| August | 10.8 °C | 30.6 °C | 17.53 mm |
| September | 6.3 °C | 24.8 °C | 36.83 mm |
| October | 0.7 °C | 16.6 °C | 40.89 mm |
| November | -4.6 °C | 7.9 °C | 27.94 mm |
| December | -8.9 °C | 1.1 °C | 23.88 mm |
| Annual | 0.6 °C | 15.3 °C | 410.46 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 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |