Malta, Idaho has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 0.5 °C (low) to 16.5 °C (high). Annual precipitation averages 248.2 Millimeters. Malta 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 | -7.7 °C | 2.8 °C | 19.05 mm |
| February | -6 °C | 5.4 °C | 11.94 mm |
| March | -2.9 °C | 11 °C | 19.05 mm |
| April | -0.5 °C | 15.2 °C | 28.45 mm |
| May | 3.5 °C | 20.3 °C | 40.39 mm |
| June | 7 °C | 25.8 °C | 21.34 mm |
| July | 10.5 °C | 31.6 °C | 14.22 mm |
| August | 9.6 °C | 31 °C | 19.81 mm |
| September | 5.1 °C | 25.4 °C | 21.08 mm |
| October | -0.1 °C | 17.7 °C | 20.57 mm |
| November | -4.5 °C | 9.1 °C | 14.73 mm |
| December | -7.9 °C | 3 °C | 17.53 mm |
| Annual | 0.5 °C | 16.5 °C | 248.16 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 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Exceptional Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |