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 signals a shift in temperature, down from an icy 38.5°F (3.6°C) in November to a subzero cold 26.8°F (-2.9°C). Foster City's nighttime temperature in December shows a minor descent, with a steady average of 18°F (-7.8°C).Humidity
In December, the average relative humidity 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 Foster City, in December, snow falls for 16.1 days, with typically accumulated 7.68" (195mm) of snow. In Foster City, during the entire year, snow falls for 92.1 days and aggregates up to 41.26" (1048mm) of snow.Daylight
December has the shortest days of the year, with an average of 8h and 42min of daylight.On the first day of December, sunrise is at 7:13 am and sunset at 4:07 pm. On the last day of the month, sunrise is at 7:32 am and sunset at 4:15 pm CST.
Sunshine
In December, the average sunshine is 3.4h.UV index
The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: The UV index of 1 during December leads to these advisories:
Prolonged exposure to sunlight rarely troubles the majority, but constant protection is vital for babies, children, and fair-skinned people. The solar radiation around mid-day is intense; avoid the Sun and stay safe. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage. Be cautious! The UV radiation from the Sun can be magnified almost twofold by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December?
What is the average humidity in December?
How many days does it rain in December?
How many days does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Foster City have in December?
What time are sunrise and sunset in December in Foster City?
How many hours of sunshine does Foster City have in December?
When is the lowest UV index?
What is the UV index intensity in December?
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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