December weather forecast
Belmont, CA

Weather in December

The first month of the winter, December, is still a mild month in Belmont, California, with an average temperature varying between 55.9°F (13.3°C) and 46.2°F (7.9°C).

Temperature

The coldest month is December, with an average high-temperature of 55.9°F (13.3°C) and an average low-temperature of 46.2°F (7.9°C).

Humidity

In December, the average relative humidity in Belmont is 71%.

Rainfall

In Belmont, during December, the rain falls for 11 days and regularly aggregates up to 1.89" (48mm) of precipitation. In Belmont, during the entire year, the rain falls for 77.5 days and collects up to 11.22" (285mm) of precipitation.

Daylight

December has the shortest days of the year in Belmont, California, with an average of 9h and 37min of daylight.
On the first day of the month, sunrise is at 7:05 am and sunset at 4:51 pm. On the last day of December, in Belmont, sunrise is at 7:23 am and sunset at 5:00 pm PST.

Sunshine

With an average of 5.8h of sunshine, December has the least sunshine of the year in Belmont.

UV index

February, November and December, with an average maximum UV index of 3, are months with the lowest UV index in Belmont. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for ordinary individuals.
Note: In December, the average maximum UV index of 3 translate into the following recommendations:
Take precautions - Protection against skin and eye damage is obliged. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the coldest month in Belmont?

December is the coldest month in Belmont, with an average high-temperature of 55.9°F (13.3°C) and an average low-temperature of 46.2°F (7.9°C).

What is the temperature in December in Belmont?

In Belmont, in December, the average high-temperature is 55.9°F (13.3°C), and the average low-temperature is 46.2°F (7.9°C).

What is the average humidity in December in Belmont?

In Belmont, the average relative humidity in December is 71%.

How much does it rain in Belmont in December?

In Belmont, California, during December, the rain falls for 11 days and regularly aggregates up to 1.89" (48mm) of precipitation.

What is the month with the shortest days in Belmont?

With an average of 9h and 37min of daylight, December has the shortest days of the year in Belmont.

What is the average length of the day in December in Belmont?

In December, the average day length in Belmont is 9h and 37min.

What time are sunrise and sunset in December in Belmont?

On the first day of December in Belmont, sunrise is at 7:05 am and sunset at 4:51 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 5:00 pm PST.

What is the month with the least sunshine in Belmont?

With an average of 5.8h of sunshine, December has the least sunshine of the year in Belmont, California.

How long on average sun shines in December in Belmont?

In Belmont, the average sunshine duration in December is 5.8h.

What is the month with the lowest UV index in Belmont?

February, November and December, with an average maximum UV index of 3, are months with the lowest UV index in Belmont.

How high is the UV index in December in Belmont?

In Belmont, California, the average daily maximum UV index in December is 3. A UV Index estimate of 3 to 5 represents a medium health risk from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Belmont, CA

Average temperature in December - Belmont, CA
  • Average high temperature in December: 55.9°F

The warmest month (with the highest average high temperature) is August (73°F).
The month with the lowest average high temperature is December (55.9°F).

  • Average low temperature in December: 46.2°F

The month with the highest average low temperature is September (56.7°F).
The coldest month (with the lowest average low temperature) is January (46°F).

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Average pressure in December
Belmont, CA

Average pressure in December - Belmont, CA
  • Average pressure in December: 30.11"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is September (29.92"Hg).

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Average wind speed in December
Belmont, CA

Average wind speed in December - Belmont, CA
  • Average wind speed in December: 6.4mph

The windiest month (with the highest average wind speed) is April (7.5mph).
The calmest month (with the lowest average wind speed) is October (5.5mph).

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Average humidity in December
Belmont, CA

Average humidity in December - Belmont, CA
  • Average humidity in December: 71%

The month with the highest relative humidity is March (75%).
The month with the lowest relative humidity is October (68%).

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Average rainfall in December
Belmont, CA

Average rainfall in December - Belmont, CA
  • Average rainfall in December: 1.89"

The wettest month (with the highest rainfall) is February (2.09").
The driest months (with the least rainfall) are July and August (0.08").

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Average rainfall days in December
Belmont, CA

Average rainfall days in December - Belmont, CA
  • Average rainfall days in December: 11 days

The month with the highest number of rainy days is March (13 days).
The month with the least rainy days is July (1.8 days).

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Average daylight in December /
Average sunshine in December
Belmont, CA

Average daylight in December / Average sunshine in December - Belmont, CA
  • Average daylight in December: 9h and 37min

The month with the longest days is June (Average daylight: 14h and 43min).
The month with the shortest days is December (Average daylight: 9h and 37min).

  • Average sunshine in December: 5h and 48min

The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).

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Average sunshine days in December
Belmont, CA

Average sunshine days in December - Belmont, CA
  • Average sunshine days in December: 19.3 days

The month with the most sunshine days is July (25.3 days).
The month with the least sunshine days is March (16.3 days).

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Average UV index in December
Belmont, CA

Average UV index in December - Belmont, CA
  • Average UV index in December: 3

The months with the highest UV index are June, July, August and September (UV index 5).
The months with the lowest UV index are February, November and December (UV index 3).

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Average cloud cover in December
Belmont, CA

Average cloud cover in December - Belmont, CA
  • Average cloud cover in December: 34

The month with the most cloud cover is March (Cloud cover 35).
The month with the least cloud cover is July (Cloud cover 9).

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Average visibility in December
Belmont, CA

Average visibility in December - Belmont, CA
  • Average visibility in December: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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