Swan River, Manitoba climate data is summarized below. Average annual temperatures range from 25.2 °F (low) to 45.1 °F (high). Annual precipitation averages 20.5 Inches. Swan River 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 | -29.7 °F | -24.4 °F | 0 in. |
| February | -29.8 °F | -23.6 °F | 0 in. |
| March | -25.3 °F | -19 °F | 0 in. |
| April | -19.7 °F | -13.1 °F | 508 in. |
| May | -15.7 °F | -8.5 °F | 1422.4 in. |
| June | -12.3 °F | -5.7 °F | 3657.6 in. |
| July | -10.8 °F | -4.3 °F | 3124.2 in. |
| August | -11.6 °F | -4.6 °F | 2057.4 in. |
| September | -14.6 °F | -7.1 °F | 1219.2 in. |
| October | -17.6 °F | -12.2 °F | 1219.2 in. |
| November | -22.8 °F | -18.4 °F | 0 in. |
| December | -28.6 °F | -24.1 °F | 0 in. |
| Annual | 25.2 °F | 45.1 °F | 20.47 in. |
| 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°F to -35°F |
| Current Drought Conditions | Normal |