Rivers, Manitoba climate data is summarized below. Average annual temperatures range from -2.9 °C (low) to 8 °C (high). Annual precipitation averages 395 Millimeters. 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 | -20.5 °C | -11 °C | 0 mm |
| February | -19.76 °C | -9.78 °C | 0 mm |
| March | -11.21 °C | -0.93 °C | 5 mm |
| April | -2.22 °C | 8.93 °C | 16 mm |
| May | 4.4 °C | 16.68 °C | 54 mm |
| June | 10.56 °C | 21.93 °C | 90 mm |
| July | 12.89 °C | 24.66 °C | 97 mm |
| August | 11.3 °C | 24.5 °C | 78 mm |
| September | 6.53 °C | 19.68 °C | 31 mm |
| October | 0.18 °C | 10.91 °C | 24 mm |
| November | -8.56 °C | 0.09 °C | 0 mm |
| December | -18.41 °C | -10.27 °C | 0 mm |
| Annual | -2.9 °C | 8 °C | 395 mm |
| 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 : -37.2°C to -34.4°C |
| Current Drought Conditions | Normal |