December weather forecast
West Menlo Park, CA

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Weather in December

The first month of the winter, December, is still a mild month in West Menlo Park, California, with an average temperature fluctuating between 55.8°F (13.2°C) and 47.1°F (8.4°C).

Temperature

December is the month when West Menlo Park, California, experiences its coldest temperatures, averaging a high of 55.8°F (13.2°C) and a low of 47.1°F (8.4°C).

Humidity

In December, the average relative humidity is 72%.

Rainfall

In West Menlo Park, in December, during 8.9 rainfall days, 0.79" (20mm) of precipitation is typically accumulated. In West Menlo Park, during the entire year, the rain falls for 57.5 days and collects up to 4.76" (121mm) of precipitation.

Daylight

The month with the shortest days in West Menlo Park is December, with an average of 9h and 36min of daylight.
On the first day of December, 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.

Sunshine

The month with the least sunshine in West Menlo Park is December, with an average of 5.9h of sunshine.

UV index

The months with the lowest UV index in West Menlo Park are February, November and December, with an average maximum UV index of 3. A UV Index of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for ordinary individuals.
Note: A maximum high UV index of 3 in December translates into the following recommendations:
Prioritize safety - Suggestions to prevent sun damage are offered. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades.
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Frequently asked questions

What is the coldest month in West Menlo Park?

In West Menlo Park, California, the average lowest temperatures are observed in December, with a high of 55.8°F (13.2°C) and a low of 47.1°F (8.4°C).

What are December temperatures in West Menlo Park?

The high-temperature in West Menlo Park during December is 55.8°F (13.2°C) and the low-temperature is 47.1°F (8.4°C).

What is the average humidity in December in West Menlo Park?

The average relative humidity in December in West Menlo Park, California, is 72%.

How much does it rain in West Menlo Park in December?

In West Menlo Park, during December, the rain falls for 8.9 days and regularly aggregates up to 0.79" (20mm) of precipitation.

What is the month with the shortest days in West Menlo Park?

With an average of 9h and 36min of daylight, December has the shortest days of the year in West Menlo Park.

How many hours of daylight does West Menlo Park have in December?

In December, the average day length in West Menlo Park is 9h and 38min.

What time are sunrise and sunset in December in West Menlo Park?

In December, on the first day of the month, 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 West Menlo Park?

The month with the least sunshine in West Menlo Park, California, is December, with an average of 5.9h of sunshine.

How long on average sun shines in December in West Menlo Park?

The average sunshine duration in December is 5.9h.

When is the lowest UV index in West Menlo Park?

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

How high is the UV index in December in West Menlo Park?

In December, the average daily maximum UV index in West Menlo Park, California, is 3. A UV Index value of 3 to 5 symbolizes a medium hazard to health from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
West Menlo Park, CA

Average temperature in December - West Menlo Park, CA
  • Average high temperature in December: 55.8°F

The warmest month (with the highest average high temperature) is August (73°F).
The month with the lowest average high temperature is December (55.8°F).

  • Average low temperature in December: 47.1°F

The months with the highest average low temperature are August and September (56.7°F).
The coldest months (with the lowest average low temperature) are January and February (46.4°F).

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Average pressure in December
West Menlo Park, CA

Average pressure in December - West Menlo Park, 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
West Menlo Park, CA

Average wind speed in December - West Menlo Park, CA
  • Average wind speed in December: 6.6mph

The windiest month (with the highest average wind speed) is April (7.6mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).

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Average humidity in December
West Menlo Park, CA

Average humidity in December - West Menlo Park, CA
  • Average humidity in December: 72%

The month with the highest relative humidity is March (76%).
The month with the lowest relative humidity is October (68%).

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Average rainfall in December
West Menlo Park, CA

Average rainfall in December - West Menlo Park, CA
  • Average rainfall in December: 0.79"

The wettest month (with the highest rainfall) is February (0.98").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days in December
West Menlo Park, CA

Average rainfall days in December - West Menlo Park, CA
  • Average rainfall days in December: 8.9 days

The month with the highest number of rainy days is March (10.6 days).
The month with the least rainy days is June (0.9 days).

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Average daylight in December /
Average sunshine in December
West Menlo Park, CA

Average daylight in December / Average sunshine in December - West Menlo Park, 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 54min).

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Average sunshine days in December
West Menlo Park, CA

Average sunshine days in December - West Menlo Park, CA
  • Average sunshine days in December: 20.4 days

The months with the most sunshine days are June and July (26.3 days).
The month with the least sunshine days is March (18.3 days).

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Average UV index in December
West Menlo Park, CA

Average UV index in December - West Menlo Park, 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
West Menlo Park, CA

Average cloud cover in December - West Menlo Park, CA
  • Average cloud cover in December: 33

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
West Menlo Park, CA

Average visibility in December - West Menlo Park, 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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West Menlo Park, California, USA

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