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Vancouver climate data
Environment Canada
Average date of first fall frost: November 10
Average date of last spring frost: March 18
Average days w/ snowfall >= 5 cm by month:
April-October: 0
November: 0.27
December: 0.86
January: 0.73
February: 0.43
March: 0.20
Average total snowfall by month:
May-September: 0
October: 0.1 cm
November: 3.2 cm
December: 14.8 cm
January: 11.1 cm
February: 6.3 cm
March: 2.3 cm
April: 0.3 cm
Extreme daily snowfall by month:
May-September: 0 cm
October: 2 cm
November: 22.1 cm
December: 41 cm
January: 29.7 cm
February: 28.6 cm
March: 25.9 cm
April: 3.8 cm
Average days w/ minimum temperature <= 2°C:
June-September: 0
October: 1.8
November: 9.5
December: 18.2
January: 15.9
February: 14.7
March: 10
April: 2.3
May: 0.03
Interpret the data how you like, but I think it's fair to say that, even within city limits, you should have winter tires on for the months of December-February. November-March is probably a good idea in non-El Nino years and a must in La Nina years (which we had this past winter).
If you go into the mountains, you should probably have them on October-March.
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