| 2023 Hardiness Zone: | Zone 3b: -35°F to -30°F Zone 4b: -25°F to -20°F Zone 5a: -20°F to -15°F Zone 4a: -30°F to -25°F | |
| 2012 Hardiness Zone: | Zone 3b: -35°F to -30°F Zone 4b: -25°F to -20°F Zone 4a: -30°F to -25°F | |
| 1990 Hardiness Zone: | Zone 3b: -35F to -30F | |
| Average First Frost Date: | Sep.11 - Sep. 20 | |
| Average Last Frost Date: | May 21 - May 31 | |
| Koppen-Geiger Climate Zone: | BSk - Cold Semi-Arid Climate | |
| Ecoregion: | 42j - Glaciated Northern Grasslands | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 59538 - Malta, MT | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | -1 | 6 | 17 | 30 | 40 | 49 | 53 | 51 | 40 | 29 | 14 | 4 | 28 |
| Avg Max Temp (°F) | 23 | 32 | 44 | 59 | 70 | 78 | 85 | 84 | 72 | 60 | 40 | 28 | 56 |
| Avg Precip (In.) | .41 | .31 | .51 | .73 | 2.08 | 2.37 | 1.62 | 1.11 | 1.08 | .58 | .42 | .43 | 11.64 |