December weather forecast
Foster City, MI

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Weather in December

The first month of the winter, December, is still a freezing cold month in Foster City, Michigan, with an average temperature ranging between min 18°F (-7.8°C) and max 26.8°F (-2.9°C).

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.
Updated: Aug 15, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is December?

In Foster City, 26.8°F (-2.9°C) is the average high-temperature and 18°F (-7.8°C) is the average low-temperature during December.

What is the average humidity in December?

In Foster City, the average relative humidity in December is 86%.

How many days does it rain in December?

In Foster City, during December, the rain falls for 8.6 days and regularly aggregates up to 1.65" (42mm) of precipitation.

How many days does it snow in December?

In Foster City, during December, snow falls for 16.1 days and regularly aggregates up to 7.68" (195mm) of snow.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 8h and 42min of daylight.

How many hours of daylight does Foster City have in December?

The average day length in December is 8h and 43min.

What time are sunrise and sunset in December in Foster City?

In December, on the first day of the month, 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.

How many hours of sunshine does Foster City have in December?

In December, the average sunshine duration is 3.4h.

When is the lowest UV index?

The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 1.

What is the UV index intensity in December?

The average daily maximum UV index in December is 1. A UV Index estimate of 2, and below, represents a low health threat from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Foster City, MI

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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 / 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 - 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 - 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 - 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 - 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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