December weather forecastNapierville, Canada
December
Weather in December
December, the first month of the winter in Napierville, is still a freezing cold month, with an average temperature varying between -7.4°C (18.7°F) and -1.8°C (28.8°F).Temperature
The onset of December results in a decrease in the average high-temperature, receding from an icy 5.3°C (41.5°F) in November to a subzero cold -1.8°C (28.8°F). In December, the temperature in Napierville drops to an average of -7.4°C (18.7°F) at night.Humidity
The average relative humidity in December in Napierville is 86%.Rainfall
In Napierville, Canada, during December, the rain falls for 8.5 days and regularly aggregates up to 22mm (0.87") of precipitation. In Napierville, Canada, during the entire year, the rain falls for 137 days and collects up to 329mm (12.95") of precipitation.Snowfall
January through May, October through December are months with snowfall. In Napierville, in December, snow falls for 14.5 days, with typically accumulated 59mm (2.32") of snow. Throughout the year, there are 72.1 snowfall days, and 390mm (15.35") of snow is accumulated.Daylight
The month with the shortest days in Napierville is December, with an average of 8h and 48min of daylight.On the first day of December, sunrise is at 7:12 am and sunset at 4:12 pm. On the last day of the month, sunrise is at 7:32 am and sunset at 4:21 pm EST.
Sunshine
In December, the average sunshine is 3.3h.UV index
January and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV rays for the average person.Note: In December, the average maximum UV index of 1 translates into the following recommendations:
While most people can stay under the sun for an hour without burning, children must always be guarded against sun exposure. Avoiding the Sun during its peak radiation time around midday is a healthy practice. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays. 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
Napierville, Canada
- Average high temperature in December: -1.8°C
The warmest month (with the highest average high temperature) is July (25.4°C).
The month with the lowest average high temperature is January (-5.3°C).
- Average low temperature in December: -7.4°C
The month with the highest average low temperature is July (15.3°C).
The coldest month (with the lowest average low temperature) is January (-12.4°C).
Average pressure in December
Napierville, Canada
- Average pressure in December: 1017.3mbar
The month with the highest atmospheric pressure is November (1017.9mbar).
The month with the lowest atmospheric pressure is June (1012.5mbar).
Average wind speed in December
Napierville, Canada
- Average wind speed in December: 12.2km/h
The windiest month (with the highest average wind speed) is April (13.9km/h).
The calmest months (with the lowest average wind speed) are July and August (10.4km/h).
Average humidity in December
Napierville, Canada
- Average humidity in December: 86%
The months with the highest relative humidity are January and February (90%).
The month with the lowest relative humidity is April (75%).
Average rainfall in December
Napierville, Canada
- Average rainfall in December: 22mm
The wettest month (with the highest rainfall) is August (37mm).
The driest month (with the least rainfall) is September (18mm).
Average rainfall days in December
Napierville, Canada
- Average rainfall days in December: 8.5 days
The month with the highest number of rainy days is June (16.6 days).
The month with the least rainy days is February (6.3 days).
Average snowfall in December
Napierville, Canada
- Average snowfall in December: 59mm
The month with the highest snowfall is January (93mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in December
Napierville, Canada
- Average snowfall days in December: 14.5 days
The month with the highest number of snowfall days is February (17.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Napierville, Canada
- Average daylight in December: 8h and 48min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in December: 3h and 18min
The months with the most sunshine are July and August (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 2h and 54min).
Average sunshine days in December
Napierville, Canada
- Average sunshine days in December: 13.5 days
The month with the most sunshine days is November (17.3 days).
The month with the least sunshine days is February (10.3 days).
Average UV index in December
Napierville, Canada
- Average UV index in December: 1
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in December
Napierville, Canada
- Average cloud cover in December: 65
The month with the most cloud cover is February (Cloud cover 70).
The month with the least cloud cover is July (Cloud cover 32).
Average visibility in December
Napierville, Canada
- Average visibility in December: 8km
The months with the highest visibility are April, May, June, July, August, September, October and November (9km).
The month with the lowest visibility is January (7km).
