December weather forecastThornhill, Canada
December
Weather in December
The first month of the winter, December, is also a wintry month in Thornhill, Canada, with an average temperature ranging between max 0.7°C (33.3°F) and min -3.5°C (25.7°F).Temperature
As Thornhill enters December, the average high-temperature decreases from the a frosty 6.5°C (43.7°F) of November to an icy 0.7°C (33.3°F). In Thornhill, December nights maintain a consistent temperature, with an average low of -3.5°C (25.7°F).Humidity
In December, the average relative humidity in Thornhill is 83%.Rainfall
In Thornhill, during December, the rain falls for 7.1 days and regularly aggregates up to 26mm (1.02") of precipitation. In Thornhill, during the entire year, the rain falls for 136.9 days and collects up to 456mm (17.95") of precipitation.Snowfall
January through April, October through December are months with snowfall. In December, in Thornhill, it is snowing for 9.7 days. Throughout December, 42mm (1.65") of snow is accumulated. Throughout the year, there are 49.5 snowfall days, and 317mm (12.48") of snow is accumulated.Daylight
The month with the shortest days in Thornhill is December, with an average of 9h and 0min of daylight.On the first day of December, sunrise is at 7:32 am and sunset at 4:41 pm. On the last day of the month, sunrise is at 7:51 am and sunset at 4:50 pm EST.
Sunshine
In December, the average sunshine is 3.5h.UV index
January and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index reading of 2, and below, represents a minimal health hazard from exposure to the Sun's UV rays for ordinary individuals.Note: A maximum UV index of 1 in December translates into the following recommendations:
Prolonged sun exposure should always be prevented in babies, children, and those with sensitive skin. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. Boost your sun resistance with garments that are densely woven yet spacious. Be alert to the fact! The reflection from snow can nearly double the UV radiation of the Sun.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Thornhill, Canada
- Average high temperature in December: 0.7°C
The warmest month (with the highest average high temperature) is July (25.1°C).
The month with the lowest average high temperature is January (-2.7°C).
- Average low temperature in December: -3.5°C
The month with the highest average low temperature is July (17.4°C).
The coldest month (with the lowest average low temperature) is January (-8°C).
Average pressure in December
Thornhill, Canada
- Average pressure in December: 1017.4mbar
The month with the highest atmospheric pressure is March (1018.3mbar).
The month with the lowest atmospheric pressure is June (1013.1mbar).
Average wind speed in December
Thornhill, Canada
- Average wind speed in December: 17km/h
The windiest month (with the highest average wind speed) is January (17.8km/h).
The calmest month (with the lowest average wind speed) is July (11km/h).
Average humidity in December
Thornhill, Canada
- Average humidity in December: 83%
The months with the highest relative humidity are January and February (85%).
The months with the lowest relative humidity are April, July and August (75%).
Average rainfall in December
Thornhill, Canada
- Average rainfall in December: 26mm
The wettest month (with the highest rainfall) is July (60mm).
The driest month (with the least rainfall) is February (23mm).
Average rainfall days in December
Thornhill, Canada
- Average rainfall days in December: 7.1 days
The month with the highest number of rainy days is July (16.7 days).
The month with the least rainy days is February (4.6 days).
Average snowfall in December
Thornhill, Canada
- Average snowfall in December: 42mm
The month with the highest snowfall is February (82mm).
The months with the least snowfall are May, June, July, August and September (0mm).
Average snowfall days in December
Thornhill, Canada
- Average snowfall days in December: 9.7 days
The month with the highest number of snowfall days is January (11.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Thornhill, Canada
- Average daylight in December: 9h and 0min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in December: 3h and 30min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 6min).
Average sunshine days in December
Thornhill, Canada
- Average sunshine days in December: 16.9 days
The month with the most sunshine days is December (16.9 days).
The month with the least sunshine days is July (10.8 days).
Average UV index in December
Thornhill, Canada
- Average UV index in December: 1
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in December
Thornhill, Canada
- Average cloud cover in December: 64
The month with the most cloud cover is January (Cloud cover 67).
The months with the least cloud cover are July and August (Cloud cover 27).
Average visibility in December
Thornhill, Canada
- Average visibility in December: 9km
The months with the highest visibility are August, September and October (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, November and December (9km).
