December weather forecastSarnia, Canada
December
Weather in December
The first month of the winter, December, is still a cold month in Sarnia, Canada, with an average temperature varying between -3°C (26.6°F) and 1.5°C (34.7°F).Temperature
With December's arrival, Sarnia sees a decrease in average high-temperatures, moving from a frosty 7.4°C (45.3°F) in November to a cold 1.5°C (34.7°F). The nights of December in Sarnia anticipate a slight dip from daytime high temperatures, settling to an average low-temperature of -3°C (26.6°F).Humidity
The average relative humidity in December in Sarnia is 82%.Rainfall
In Sarnia, in December, during 9.2 rainfall days, 29mm (1.14") of precipitation is typically accumulated. Throughout the year, in Sarnia, there are 140.4 rainfall days, and 493mm (19.41") of precipitation is accumulated.Snowfall
Months with snowfall are January through May, October through December. In Sarnia, Canada, in December, snow falls for 12.1 days, with typically accumulated 49mm (1.93") of snow. In Sarnia, during the entire year, snow falls for 55.2 days and aggregates up to 312mm (12.28") of snow.Sea temperature
In December, the average sea temperature is 4.8°C (40.6°F).Note: In terms of swimming, this condition is dangerously life-threatening. Water temperatures cause sharp pain and provoke immediate hyperventilation. A specialized swimsuit is compulsory to alleviate thermal damage.
Daylight
The month with the shortest days is December, with an average of 9h and 6min of daylight.On the first day of the month, sunrise is at 7:41 am and sunset at 4:56 pm. On the last day of December, in Sarnia, sunrise is at 8:00 am and sunset at 5:05 pm EST.
Sunshine
The average sunshine in December in Sarnia is 3.2h.UV index
January and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a low health risk from unsafe exposure to UV radiation for the ordinary person.Note: The maximum UV index of 1 during December leads to these instructions:
Unlike children, who always need sun protection, most individuals can remain in the sun for up to an hour without getting burnt. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Take into account! The reflection from snow can nearly double the Sun's UV radiation intensity.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Sarnia, Canada
- Average high temperature in December: 1.5°C
The warmest month (with the highest average high temperature) is July (25.8°C).
The month with the lowest average high temperature is January (-2.3°C).
- Average low temperature in December: -3°C
The month with the highest average low temperature is July (16.3°C).
The coldest month (with the lowest average low temperature) is January (-7.5°C).
Average pressure in December
Sarnia, Canada
- Average pressure in December: 1018.1mbar
The month with the highest atmospheric pressure is March (1018.8mbar).
The month with the lowest atmospheric pressure is June (1013.5mbar).
Average wind speed in December
Sarnia, Canada
- Average wind speed in December: 17.5km/h
The windiest month (with the highest average wind speed) is January (18.2km/h).
The calmest month (with the lowest average wind speed) is July (11km/h).
Average humidity in December
Sarnia, Canada
- Average humidity in December: 82%
The month with the highest relative humidity is February (86%).
The months with the lowest relative humidity are April and May (76%).
Average rainfall in December
Sarnia, Canada
- Average rainfall in December: 29mm
The wettest month (with the highest rainfall) is May (54mm).
The driest month (with the least rainfall) is February (28mm).
Average rainfall days in December
Sarnia, Canada
- Average rainfall days in December: 9.2 days
The month with the highest number of rainy days is May (15.7 days).
The month with the least rainy days is February (5.7 days).
Average snowfall in December
Sarnia, Canada
- Average snowfall in December: 49mm
The month with the highest snowfall is February (99mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in December
Sarnia, Canada
- Average snowfall days in December: 12.1 days
The month with the highest number of snowfall days is January (14.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average sea temperature in December
Sarnia, Canada
- Average sea temperature in December: 4.8°C
The best month for swimming (with the highest average sea temperature) is August (23.2°C).
The coldest months (with the lowest average sea temperature) are February and March (0.3°C).
Average daylight in December /
Average sunshine in December
Sarnia, Canada
- Average daylight in December: 9h and 6min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in December: 3h and 12min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 2h and 54min).
Average sunshine days in December
Sarnia, Canada
- Average sunshine days in December: 12.5 days
The month with the most sunshine days is November (15.2 days).
The month with the least sunshine days is February (11.3 days).
Average UV index in December
Sarnia, Canada
- Average UV index in December: 1
The months with the highest UV index are July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in December
Sarnia, Canada
- Average cloud cover in December: 66
The month with the most cloud cover is January (Cloud cover 70).
The month with the least cloud cover is July (Cloud cover 30).
Average visibility in December
Sarnia, Canada
- Average visibility in December: 9km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
