December weather forecast
Menlo Park, CA

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Weather in December

The first month of the winter, December, is still a refreshing month in Menlo Park, California, with an average temperature ranging between min 45.5°F (7.5°C) and max 56.3°F (13.5°C).

Temperature

December, having an average high-temperature of 56.3°F (13.5°C) and an average low-temperature of 45.5°F (7.5°C), is the coldest month.

Humidity

The average relative humidity in December in Menlo Park is 71%.

Rainfall

In Menlo Park, in December, it is raining for 8.6 days, with typically 1.54" (39mm) of accumulated precipitation. In Menlo Park, during the entire year, the rain falls for 63.3 days and collects up to 9.53" (242mm) of precipitation.

Daylight

The month with the shortest days in Menlo Park, California, 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 4:50 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 Menlo Park is December, with an average of 5.9h of sunshine.

UV index

The months with the lowest UV index in Menlo Park, California, are February, November and December, with an average maximum UV index of 3. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for ordinary individuals.
Note: The daily maximum UV index of 3 in December interprets into the following advice:
Be mindful. Those with pale skin might receive burns in fewer than 30 minutes. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.
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Frequently asked questions

What is the coldest month in Menlo Park?

The coldest temperatures occur during December, when averages reach a peak of 56.3°F (13.5°C) and a low of 45.5°F (7.5°C).

What are December temperatures in Menlo Park?

In December, in Menlo Park, the average high-temperature is 56.3°F (13.5°C), and the average low-temperature is 45.5°F (7.5°C).

What is the average humidity in December in Menlo Park?

The average relative humidity in December is 71%.

How much does it rain in Menlo Park in December?

In December, in Menlo Park, the rain falls for 8.6 days. Throughout December, 1.54" (39mm) of precipitation is accumulated.

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

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

What is the average length of the day in December in Menlo Park?

The average day length in December in Menlo Park, California, is 9h and 38min.

When is the sunrise / sunset in December in Menlo Park?

In December, on the first day of the month, sunrise is at 7:05 am and sunset at 4:50 pm. On the last day of the month, in Menlo Park, California, sunrise is at 7:23 am and sunset at 5:01 pm PST.

What is the month with the least sunshine in Menlo Park?

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

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

The average sunshine duration in December in Menlo Park is 5.9h.

What are the months with the lowest UV index in Menlo Park?

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

What is the UV index intensity in December in Menlo Park?

In December, the average daily maximum UV index in Menlo Park is 3. A UV Index reading of 3 to 5 represents a moderate health threat from unprotected exposure to 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
Menlo Park, CA

Average temperature in December - Menlo Park, CA
  • Average high temperature in December: 56.3°F

The warmest months (with the highest average high temperature) are July and August (77.5°F).
The month with the lowest average high temperature is December (56.3°F).

  • Average low temperature in December: 45.5°F

The month with the highest average low temperature is August (57°F).
The coldest months (with the lowest average low temperature) are January and February (45.1°F).

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Average pressure in December
Menlo Park, CA

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

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

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Average wind speed in December
Menlo Park, CA

Average wind speed in December - Menlo Park, CA
  • Average wind speed in December: 5.7mph

The windiest months (with the highest average wind speed) are April and May (6.5mph).
The calmest months (with the lowest average wind speed) are September and October (4.9mph).

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Average humidity in December
Menlo Park, CA

Average humidity in December - Menlo Park, CA
  • Average humidity in December: 71%

The month with the highest relative humidity is March (74%).
The months with the lowest relative humidity are September and October (65%).

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Average rainfall in December
Menlo Park, CA

Average rainfall in December - Menlo Park, CA
  • Average rainfall in December: 1.54"

The wettest month (with the highest rainfall) is February (2.01").
The driest month (with the least rainfall) is July (0").

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Average rainfall days in December
Menlo Park, CA

Average rainfall days in December - Menlo Park, CA
  • Average rainfall days in December: 8.6 days

The month with the highest number of rainy days is March (12.3 days).
The month with the least rainy days is August (0.6 days).

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

Average daylight in December / Average sunshine in December - 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 6min).
The month with the least sunshine is December (Average sunshine: 5h and 54min).

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Average sunshine days in December
Menlo Park, CA

Average sunshine days in December - Menlo Park, CA
  • Average sunshine days in December: 21.7 days

The month with the most sunshine days is July (30.2 days).
The month with the least sunshine days is March (18 days).

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Average UV index in December
Menlo Park, CA

Average UV index in December - Menlo Park, CA
  • Average UV index in December: 3

The months with the highest UV index are April, May, June, July, August, September and October (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
Menlo Park, CA

Average cloud cover in December - Menlo Park, CA
  • Average cloud cover in December: 34

The months with the most cloud cover are March and December (Cloud cover 34).
The month with the least cloud cover is July (Cloud cover 6).

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Average visibility in December
Menlo Park, CA

Average visibility in December - 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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Menlo Park, California, USA

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