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Ottawa
( show ) Climate data for Ottawa ( Central Experimental Farm ) , 1981 -- 2010 normals , extremes 1872 -- present Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Record high ° C ( ° F ) 15.6 ( 60.1 ) 12.7 ( 54.9 ) 26.7 ( 80.1 ) 31.2 ( 88.2 ) 35.2 ( 95.4 ) 36.7 ( 98.1 ) 37.8 ( 100 ) 37.8 ( 100 ) 36.7 ( 98.1 ) 29.4 ( 84.9 ) 23.3 ( 73.9 ) 17.2 ( 63 ) 37.8 ( 100 ) Average high ° C ( ° F ) − 5.8 ( 21.6 ) − 3.1 ( 26.4 ) 2.4 ( 36.3 ) 11.4 ( 52.5 ) 19.0 ( 66.2 ) 24.1 ( 75.4 ) 26.6 ( 79.9 ) 25.4 ( 77.7 ) 20.5 ( 68.9 ) 12.8 ( 55 ) 5.5 ( 41.9 ) − 2.0 ( 28.4 ) 11.4 ( 52.5 ) Daily mean ° C ( ° F ) − 10.2 ( 13.6 ) − 7.9 ( 17.8 ) − 2.2 ( 28 ) 6.5 ( 43.7 ) 13.5 ( 56.3 ) 18.7 ( 65.7 ) 21.2 ( 70.2 ) 19.9 ( 67.8 ) 15.3 ( 59.5 ) 8.4 ( 47.1 ) 2.0 ( 35.6 ) − 5.6 ( 21.9 ) 6.6 ( 43.9 ) Average low ° C ( ° F ) − 14.4 ( 6.1 ) − 12.5 ( 9.5 ) − 6.8 ( 19.8 ) 1.5 ( 34.7 ) 8.0 ( 46.4 ) 13.3 ( 55.9 ) 15.7 ( 60.3 ) 14.5 ( 58.1 ) 10.1 ( 50.2 ) 4.0 ( 39.2 ) − 1.5 ( 29.3 ) − 9.2 ( 15.4 ) 1.9 ( 35.4 ) Record low ° C ( ° F ) − 37.8 ( − 36 ) − 38.3 ( − 36.9 ) − 36.7 ( − 34.1 ) − 20.6 ( − 5.1 ) − 7.2 ( 19 ) 0.0 ( 32 ) 3.3 ( 37.9 ) 1.1 ( 34 ) − 4.4 ( 24.1 ) − 12.8 ( 9 ) − 30.6 ( − 23.1 ) − 38.9 ( − 38 ) − 38.9 ( − 38 ) Average precipitation mm ( inches ) 62.9 ( 2.476 ) 49.7 ( 1.957 ) 57.5 ( 2.264 ) 71.1 ( 2.799 ) 86.6 ( 3.409 ) 92.7 ( 3.65 ) 84.4 ( 3.323 ) 83.8 ( 3.299 ) 92.7 ( 3.65 ) 85.9 ( 3.382 ) 82.7 ( 3.256 ) 69.5 ( 2.736 ) 919.5 ( 36.201 ) Average rainfall mm ( inches ) 23.0 ( 0.906 ) 17.9 ( 0.705 ) 28.8 ( 1.134 ) 63.2 ( 2.488 ) 86.6 ( 3.409 ) 92.7 ( 3.65 ) 84.4 ( 3.323 ) 83.8 ( 3.299 ) 92.7 ( 3.65 ) 83.1 ( 3.272 ) 67.5 ( 2.657 ) 31.9 ( 1.256 ) 755.5 ( 29.744 ) Average snowfall cm ( inches ) 44.3 ( 17.44 ) 34.7 ( 13.66 ) 29.1 ( 11.46 ) 7.2 ( 2.83 ) 0.0 ( 0 ) 0.0 ( 0 ) 0.0 ( 0 ) 0.0 ( 0 ) 0.0 ( 0 ) 2.9 ( 1.14 ) 16.0 ( 6.3 ) 41.3 ( 16.26 ) 175.4 ( 69.06 ) Average precipitation days ( ≥ 0.2 mm ) 16.0 11.7 11.5 13.2 14.5 12.4 11.6 11.2 12.9 14.9 15.2 15.6 160.7 Average rainy days ( ≥ 0.2 mm ) 3.7 3.5 5.5 11.5 14.4 12.4 11.6 11.2 12.9 14.6 11.6 5.5 118.3 Average snowy days ( ≥ 0.2 cm ) 14.1 9.7 7.4 2.7 0.08 0.0 0.0 0.0 0.0 0.81 5.1 12.2 52.0 Mean monthly sunshine hours 99.3 131.3 167.1 189.8 229.8 254.2 279.0 249.3 177.6 139.4 84.3 82.6 2,083.7 Percent possible sunshine 35.0 44.9 45.3 46.9 49.9 54.3 58.9 57.1 47.1 41.0 29.4 30.3 45.0 Source : Environment Canada
( show ) Climate data for Ottawa ( Central Experimental Farm ) , 1981 -- 2010 normals , extremes 1872 -- present Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Record high ° C ( ° F ) 15.6 ( 60.1 ) 12.7 ( 54.9 ) 26.7 ( 80.1 ) 31.2 ( 88.2 ) 35.2 ( 95.4 ) 36.7 ( 98.1 ) 37.8 ( 100 ) 37.8 ( 100 ) 36.7 ( 98.1 ) 29.4 ( 84.9 ) 23.3 ( 73.9 ) 17.2 ( 63 ) 37.8 ( 100 ) Average high ° C ( ° F ) − 5.8 ( 21.6 ) − 3.1 ( 26.4 ) 2.4 ( 36.3 ) 11.4 ( 52.5 ) 19.0 ( 66.2 ) 24.1 ( 75.4 ) 26.6 ( 79.9 ) 25.4 ( 77.7 ) 20.5 ( 68.9 ) 12.8 ( 55 ) 5.5 ( 41.9 ) − 2.0 ( 28.4 ) 11.4 ( 52.5 ) Daily mean ° C ( ° F ) − 10.2 ( 13.6 ) − 7.9 ( 17.8 ) − 2.2 ( 28 ) 6.5 ( 43.7 ) 13.5 ( 56.3 ) 18.7 ( 65.7 ) 21.2 ( 70.2 ) 19.9 ( 67.8 ) 15.3 ( 59.5 ) 8.4 ( 47.1 ) 2.0 ( 35.6 ) − 5.6 ( 21.9 ) 6.6 ( 43.9 ) Average low ° C ( ° F ) − 14.4 ( 6.1 ) − 12.5 ( 9.5 ) − 6.8 ( 19.8 ) 1.5 ( 34.7 ) 8.0 ( 46.4 ) 13.3 ( 55.9 ) 15.7 ( 60.3 ) 14.5 ( 58.1 ) 10.1 ( 50.2 ) 4.0 ( 39.2 ) − 1.5 ( 29.3 ) − 9.2 ( 15.4 ) 1.9 ( 35.4 ) Record low ° C ( ° F ) − 37.8 ( − 36 ) − 38.3 ( − 36.9 ) − 36.7 ( − 34.1 ) − 20.6 ( − 5.1 ) − 7.2 ( 19 ) 0.0 ( 32 ) 3.3 ( 37.9 ) 1.1 ( 34 ) − 4.4 ( 24.1 ) − 12.8 ( 9 ) − 30.6 ( − 23.1 ) − 38.9 ( − 38 ) − 38.9 ( − 38 ) Average precipitation mm ( inches ) 62.9 ( 2.476 ) 49.7 ( 1.957 ) 57.5 ( 2.264 ) 71.1 ( 2.799 ) 86.6 ( 3.409 ) 92.7 ( 3.65 ) 84.4 ( 3.323 ) 83.8 ( 3.299 ) 92.7 ( 3.65 ) 85.9 ( 3.382 ) 82.7 ( 3.256 ) 69.5 ( 2.736 ) 919.5 ( 36.201 ) Average rainfall mm ( inches ) 23.0 ( 0.906 ) 17.9 ( 0.705 ) 28.8 ( 1.134 ) 63.2 ( 2.488 ) 86.6 ( 3.409 ) 92.7 ( 3.65 ) 84.4 ( 3.323 ) 83.8 ( 3.299 ) 92.7 ( 3.65 ) 83.1 ( 3.272 ) 67.5 ( 2.657 ) 31.9 ( 1.256 ) 755.5 ( 29.744 ) Average snowfall cm ( inches ) 44.3 ( 17.44 ) 34.7 ( 13.66 ) 29.1 ( 11.46 ) 7.2 ( 2.83 ) 0.0 ( 0 ) 0.0 ( 0 ) 0.0 ( 0 ) 0.0 ( 0 ) 0.0 ( 0 ) 2.9 ( 1.14 ) 16.0 ( 6.3 ) 41.3 ( 16.26 ) 175.4 ( 69.06 ) Average precipitation days ( ≥ 0.2 mm ) 16.0 11.7 11.5 13.2 14.5 12.4 11.6 11.2 12.9 14.9 15.2 15.6 160.7 Average rainy days ( ≥ 0.2 mm ) 3.7 3.5 5.5 11.5 14.4 12.4 11.6 11.2 12.9 14.6 11.6 5.5 118.3 Average snowy days ( ≥ 0.2 cm ) 14.1 9.7 7.4 2.7 0.08 0.0 0.0 0.0 0.0 0.81 5.1 12.2 52.0 Mean monthly sunshine hours 99.3 131.3 167.1 189.8 229.8 254.2 279.0 249.3 177.6 139.4 84.3 82.6 2,083.7 Percent possible sunshine 35.0 44.9 45.3 46.9 49.9 54.3 58.9 57.1 47.1 41.0 29.4 30.3 45.0 Source : Environment Canada