Hanna, Alberta climate data is summarized below. Average annual temperatures range from -2.1 °C (low) to 9.6 °C (high). Annual precipitation averages 410 Millimeters. Hanna is located in USDA Plant Hardiness Zone 3a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -14.63 °C | -5.05 °C | 0 mm |
| February | -14.25 °C | -3.99 °C | 0 mm |
| March | -7.98 °C | 2.4 °C | 0 mm |
| April | -2.06 °C | 10.13 °C | 32 mm |
| May | 3.67 °C | 17.05 °C | 59 mm |
| June | 8.54 °C | 20.79 °C | 111 mm |
| July | 11.37 °C | 24.64 °C | 76 mm |
| August | 10.29 °C | 23.73 °C | 68 mm |
| September | 5.09 °C | 19.19 °C | 40 mm |
| October | -0.72 °C | 11.4 °C | 24 mm |
| November | -8.25 °C | 1.37 °C | 0 mm |
| December | -15.98 °C | -6.73 °C | 0 mm |
| Annual | -2.1 °C | 9.6 °C | 410 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 3a : -40°C to -37.2°C |
| Current Drought Conditions | Normal |