December weather forecast
Belmont, CA

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Weather in December

December, the first month of the winter in Belmont, is still a refreshing month, with temperature in the range of an average low of 46.2°F (7.9°C) and an average high of 55.9°F (13.3°C).

Temperature

December is the coldest month, exhibiting average temperatures of 55.9°F (13.3°C) at the peak and 46.2°F (7.9°C) at the base.

Humidity

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

Rainfall

In Belmont, in December, it is raining for 11 days, with typically 1.89" (48mm) of accumulated precipitation. Throughout the year, there are 77.5 rainfall days, and 11.22" (285mm) of precipitation is accumulated.

Daylight

The month with the shortest days in Belmont, California, is December, with an average of 9h and 36min 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, sunrise is at 7:23 am and sunset at 5:01 pm PST.

Sunshine

The month with the least sunshine in Belmont, California, is December, with an average of 5.8h of sunshine.

UV index

February, November and December, with an average maximum UV index of 3, are months with the lowest UV index. A UV Index value of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for the ordinary person.
Note: An average UV index of 3 in December transforms into this advice:
Adopt protective measures - It is advised to guard against sun damage. The solar radiation around mid-day is intense; avoid the Sun and stay safe. Enhance your sun protection with tightly woven, yet airy clothing.
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Frequently asked questions

What are the coldest months in Belmont?

In Belmont, December records the average lowest temperatures, peaking at 55.9°F (13.3°C) and reaching a low of 46.2°F (7.9°C).

What is the temperature in December in Belmont?

The high-temperature, in December, in Belmont, is 55.9°F (13.3°C), while the low-temperature averages to 46.2°F (7.9°C).

What is the average humidity in December in Belmont?

The average relative humidity in December in Belmont, California, is 71%.

How much does it rain in Belmont in December?

In Belmont, California, in December, during 11 rainfall days, 1.89" (48mm) of precipitation is typically accumulated.

What is the month with the shortest days in Belmont?

The month with the shortest days in Belmont, California, is December, with an average of 9h and 36min of daylight.

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

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

When are sunrise and sunset in December in Belmont?

On the first day of December in Belmont, California, 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 5:01 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.

How long on average sun shines in December in Belmont?

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

What are the months with the lowest UV index in Belmont?

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

What is the UV index reading in December in Belmont?

In December, the average daily maximum UV index is 3. A UV Index reading of 3 to 5 represents a medium health risk from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average daylight
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 4min

The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).

  • Average sunshine in December: 5h and 5min

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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Belmont, California, USA

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