Altona, Manitoba climate data is summarized below. Average annual temperatures range from 29.2 °F (low) to 48.2 °F (high). Annual precipitation averages 16.6 Inches. 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 | -28.7 °F | -23.6 °F | 0 in. |
| February | -28.2 °F | -22.8 °F | 0 in. |
| March | -23 °F | -17.7 °F | 203.2 in. |
| April | -18.4 °F | -12.3 °F | 508 in. |
| May | -14.8 °F | -7.9 °F | 1549.4 in. |
| June | -11.2 °F | -4.9 °F | 2032 in. |
| July | -10 °F | -3.5 °F | 2565.4 in. |
| August | -10.8 °F | -3.7 °F | 1981.2 in. |
| September | -13.4 °F | -6.4 °F | 1473.2 in. |
| October | -16.8 °F | -11.1 °F | 355.6 in. |
| November | -21.5 °F | -16.8 °F | 25.4 in. |
| December | -27 °F | -22.8 °F | 0 in. |
| Annual | 29.2 °F | 48.2 °F | 16.57 in. |
| 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 : -30°F to -25°F |
| Current Drought Conditions | Abnormally Dry |