Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
The arrival of December indicates a decrease in the average high-temperature, moving from a wintry 38.5°F (3.6°C) in November to a subzero cold 26.8°F (-2.9°C). Foster City's average temperature during the nights of December is recorded at a still freezing cold 18°F (-7.8°C).Humidity
The average relative humidity in December in Foster City is 86%.Rainfall
In December, the rain falls for 8.6 days. Throughout December, 1.65" (42mm) of precipitation is accumulated. In Foster City, during the entire year, the rain falls for 137.4 days and collects up to 22.83" (580mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. In December, in Foster City, it is snowing for 16.1 days. Throughout December, 7.68" (195mm) of snow is accumulated. Throughout the year, in Foster City, Michigan, there are 92.1 snowfall days, and 41.26" (1048mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 8h and 42min of daylight.On the first day of the month, sunrise is at 7:13 am and sunset at 4:07 pm. On the last day of December, sunrise is at 7:32 am and sunset at 4:15 pm CST.
Sunshine
In Foster City, the average sunshine in December is 3.4h.UV index
January through March, November and December, with an average maximum UV index of 1, are months with the lowest UV index in Foster City. A UV Index of 2, and less, symbolizes a low health risk from exposure to the Sun's UV rays for the ordinary person.Note: The daily high UV index of 1 during December translates into the following recommendations:
Children necessitate constant protection from sunlight, unlike the majority, who can remain under the sun for about an hour without burning. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. Employ a wide-brim hat for potent defense against up to 50% of UV rays. Be alert to the fact! The reflection from snow can nearly double the UV radiation of the Sun.
Frequently asked questions
How cold is it in Foster City in December?
What is the average humidity in December in Foster City?
How many days does it rain in December in Foster City?
How much does it snow in Foster City in December?
What is the month with the shortest days in Foster City?
What is the average length of the day in December in Foster City?
What time are sunrise and sunset in December in Foster City?
How many hours of sunshine does Foster City have in December?
What are the months with the lowest UV index in Foster City?
What is the UV index reading in December in Foster City?
Average temperature in December
Foster City, MI
- Average high temperature in December: 26.8°F
The warmest month (with the highest average high temperature) is July (77.5°F).
The month with the lowest average high temperature is January (21°F).
- Average low temperature in December: 18°F
The month with the highest average low temperature is July (56.8°F).
The coldest month (with the lowest average low temperature) is January (10.2°F).
Average pressure in December
Foster City, MI
- Average pressure in December: 30.04"Hg
The month with the highest atmospheric pressure is March (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in December
Foster City, MI
- Average wind speed in December: 7.8mph
The windiest month (with the highest average wind speed) is April (8.3mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).
Average humidity in December
Foster City, MI
- Average humidity in December: 86%
The month with the highest relative humidity is February (90%).
The month with the lowest relative humidity is May (72%).
Average rainfall in December
Foster City, MI
- Average rainfall in December: 1.65"
The wettest month (with the highest rainfall) is June (2.6").
The driest month (with the least rainfall) is January (1.14").
Average rainfall days in December
Foster City, MI
- Average rainfall days in December: 8.6 days
The months with the highest number of rainy days are May, June and July (15.3 days).
The month with the least rainy days is February (5.7 days).
Average snowfall in December
Foster City, MI
- Average snowfall in December: 7.68"
The month with the highest snowfall is February (9.09").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Foster City, MI
- Average snowfall days in December: 16.1 days
The month with the highest number of snowfall days is January (20.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Foster City, MI
- Average daylight in December: 8h and 4min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in December: 3h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is February (Average sunshine: 2h and 48min).
Average sunshine days in December
Foster City, MI
- Average sunshine days in December: 11.9 days
The month with the most sunshine days is September (15.5 days).
The month with the least sunshine days is February (9.1 days).
Average UV index in December
Foster City, MI
- 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, February, March, November and December (UV index 1).
Average cloud cover in December
Foster City, MI
- Average cloud cover in December: 64
The month with the most cloud cover is February (Cloud cover 70).
The month with the least cloud cover is July (Cloud cover 34).
Average visibility in December
Foster City, MI
- Average visibility in December: 5mi
The months with the highest visibility are May, June, October and November (6mi).
The month with the lowest visibility is February (4mi).
Foster City, Michigan, USA
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