Altona, Manitoba climate data is summarized below. Average annual temperatures range from -1.6 °C (low) to 9 °C (high). Annual precipitation averages 421 Millimeters. Altona is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -19.64 °C | -10.5 °C | 0 mm |
| February | -18.74 °C | -9.1 °C | 0 mm |
| March | -9.46 °C | 0.2 °C | 8 mm |
| April | -1.05 °C | 9.82 °C | 20 mm |
| May | 5.3 °C | 17.74 °C | 61 mm |
| June | 11.78 °C | 23.18 °C | 80 mm |
| July | 13.92 °C | 25.73 °C | 101 mm |
| August | 12.59 °C | 25.43 °C | 78 mm |
| September | 7.97 °C | 20.55 °C | 58 mm |
| October | 1.72 °C | 11.95 °C | 14 mm |
| November | -6.68 °C | 1.81 °C | 1 mm |
| December | -16.66 °C | -8.95 °C | 0 mm |
| Annual | -1.6 °C | 9 °C | 421 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Abnormally Dry |