Rivers, Manitoba climate data is summarized below. Average annual temperatures range from 26.8 °F (low) to 46.3 °F (high). Annual precipitation averages 15.6 Inches. Rivers is located in USDA Plant Hardiness Zone 3b. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -29.2 °F | -23.9 °F | 0 in. |
| February | -28.8 °F | -23.2 °F | 0 in. |
| March | -24 °F | -18.3 °F | 127 in. |
| April | -19 °F | -12.8 °F | 406.4 in. |
| May | -15.3 °F | -8.5 °F | 1371.6 in. |
| June | -11.9 °F | -5.6 °F | 2286 in. |
| July | -10.6 °F | -4.1 °F | 2463.8 in. |
| August | -11.5 °F | -4.2 °F | 1981.2 in. |
| September | -14.2 °F | -6.8 °F | 787.4 in. |
| October | -17.7 °F | -11.7 °F | 609.6 in. |
| November | -22.5 °F | -17.7 °F | 0 in. |
| December | -28 °F | -23.5 °F | 0 in. |
| Annual | 26.8 °F | 46.3 °F | 15.55 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 3b : -35°F to -30°F |
| Current Drought Conditions | Normal |