Sioux Narrows, Ontario climate data is summarized below. Average annual temperatures range from -1.5 °C (low) to 7.7 °C (high). Annual precipitation averages 247 Millimeters. Sioux Narrows 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 | -21.02 °C | -11.21 °C | 0 mm |
| February | -20.39 °C | -8.86 °C | 0 mm |
| March | -11.36 °C | 0.13 °C | 6 mm |
| April | -2.71 °C | 7.91 °C | 13 mm |
| May | 4.8 °C | 15.48 °C | 44 mm |
| June | 11.65 °C | 21 °C | 56 mm |
| July | 14.62 °C | 23.88 °C | 44 mm |
| August | 14.32 °C | 23.43 °C | 32 mm |
| September | 9.71 °C | 18.35 °C | 27 mm |
| October | 3.72 °C | 10.37 °C | 17 mm |
| November | -4.31 °C | 1.32 °C | 8 mm |
| December | -16.42 °C | -8.96 °C | 0 mm |
| Annual | -1.5 °C | 7.7 °C | 247 mm |
| 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 : -34.4°C to -31.7°C |
| Current Drought Conditions | Normal |