The month of December in Toronto experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 56% to 60%.
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Toronto, the chance of a wet day over the course of December is gradually decreasing, starting the month at 22% and ending it at 19%.
The average sliding 31-day rainfall during December in Toronto is decreasing, starting the month at 1.3 inches, when it rarely exceeds 2.5 inches or falls below 0.3 inches, and ending the month at 0.7 inches, when it rarely exceeds 1.4 inches
The average sliding 31-day snowfall during December in Toronto is increasing, starting the month at 1.7 inches, when it rarely exceeds 5.1 inches or falls below -0.0 inches, and ending the month at 3.2 inches, when it rarely exceeds 9.3 inches or falls below 0.2 inches
Over the course of December in Toronto, the length of the day is essentially constant. The shortest day of the month is December 21, with 8 hours, 55 minutes of daylight and the longest day is December 1, with 9 hours, 10 minutes of daylight.
The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. .
The average hourly wind speed in Toronto is increasing during December, increasing from 12.9 miles per hour to 14.1 miles per hour over the course of the month