Sioux Narrows, Ontario climate data is summarized below. Average annual temperatures range from 29.4 °F (low) to 45.9 °F (high). Annual precipitation averages 9.7 Inches. 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 | -29.5 °F | -24 °F | 0 in. |
| February | -29.1 °F | -22.7 °F | 0 in. |
| March | -24.1 °F | -17.7 °F | 152.4 in. |
| April | -19.3 °F | -13.4 °F | 330.2 in. |
| May | -15.1 °F | -9.2 °F | 1117.6 in. |
| June | -11.3 °F | -6.1 °F | 1422.4 in. |
| July | -9.7 °F | -4.5 °F | 1117.6 in. |
| August | -9.8 °F | -4.8 °F | 812.8 in. |
| September | -12.4 °F | -7.6 °F | 685.8 in. |
| October | -15.7 °F | -12 °F | 431.8 in. |
| November | -20.2 °F | -17 °F | 203.2 in. |
| December | -26.9 °F | -22.8 °F | 0 in. |
| Annual | 29.4 °F | 45.9 °F | 9.71 in. |
| 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 : -30°F to -25°F |
| Current Drought Conditions | Normal |