December weather forecast
Campbell, CA

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The long roads in the crowded city of Campbell, California
The long roads in the crowded city of Campbell, California

Weather in December

The first month of the winter, December, is still a mild month in Campbell, California, with an average temperature ranging between max 56.7°F (13.7°C) and min 43.7°F (6.5°C).

Temperature

Campbell's December weather, marked by an average high temperature of 56.7°F (13.7°C) and an average low temperature of 43.7°F (6.5°C), is the coldest in the year.

Humidity

The average relative humidity in December is 71%.

Rainfall

In Campbell, in December, during 9.6 rainfall days, 2.01" (51mm) of precipitation is typically accumulated. In Campbell, during the entire year, the rain falls for 68.6 days and collects up to 11.57" (294mm) of precipitation.

Daylight

The month with the shortest days is December, with an average of 9h and 36min of daylight.
On the first day of December, sunrise is at 7:03 am and sunset at 4:50 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 5:00 pm PST.

Sunshine

The month with the least sunshine in Campbell is December, with an average of 6h of sunshine.

UV index

January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index in Campbell. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for the ordinary person.
Note: In December, the maximum UV index of 3 suggests these recommendations:
Exercise caution. Those with pale skin may experience burns in less than half an hour. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat.

Frequently asked questions

What are the coldest months in Campbell?

In Campbell, December is known for its average lowest temperatures, reaching a high of 56.7°F (13.7°C) and a low of 43.7°F (6.5°C).

What are the temperatures in Campbell in December?

December temperatures vary between a high-temperature of 56.7°F (13.7°C) and a low-temperature of 43.7°F (6.5°C). The average heat index (a.k.a. 'felt air temperature', 'feels like'), which combines air temperature and relative humidity, in July is appraised at 82.4°F (28°C).

What is the average humidity in December in Campbell?

The average relative humidity in December in Campbell is 71%.

How many days does it rain in December in Campbell?

In Campbell, during December, the rain falls for 9.6 days and regularly aggregates up to 2.01" (51mm) of precipitation.

What is the month with the shortest days in Campbell?

With an average of 9h and 36min of daylight, December has the shortest days of the year in Campbell, California.

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

In December, the average day length is 9h and 39min.

When is the sunrise / sunset in December in Campbell?

On the first day of December in Campbell, California, sunrise is at 7:03 am and sunset at 4:50 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 5:00 pm PST.

What is the month with the least sunshine in Campbell?

The month with the least sunshine is December, with an average of 6h of sunshine.

How long on average sun shines in December in Campbell?

In December, the average sunshine duration in Campbell is 6h.

When is the lowest UV index in Campbell?

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

What is the UV index reading in December in Campbell?

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

Average temperature in December - Campbell, CA
  • Average high temperature in December: 56.7°F

The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is December (56.7°F).

  • Average low temperature in December: 43.7°F

The month with the highest average low temperature is August (55.9°F).
The coldest month (with the lowest average low temperature) is February (43.5°F).

Average pressure in December
Campbell, CA

Average pressure in December - Campbell, 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).

Average wind speed in December
Campbell, CA

Average wind speed in December - Campbell, CA
  • Average wind speed in December: 5.1mph

The windiest month (with the highest average wind speed) is April (5.9mph).
The calmest months (with the lowest average wind speed) are August, September, October and November (4.5mph).

Average humidity in December
Campbell, CA

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

The month with the highest relative humidity is March (74%).
The months with the lowest relative humidity are July and September (62%).

Average rainfall in December
Campbell, CA

Average rainfall in December - Campbell, CA
  • Average rainfall in December: 2.01"

The wettest month (with the highest rainfall) is February (2.2").
The driest months (with the least rainfall) are July and August (0.04").

Average rainfall days in December
Campbell, CA

Average rainfall days in December - Campbell, CA
  • Average rainfall days in December: 9.6 days

The month with the highest number of rainy days is March (12.5 days).
The month with the least rainy days is August (0.9 days).

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

Average daylight in December / Average sunshine in December - Campbell, 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: 6h and 0min

The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 0min).

Average sunshine days in December
Campbell, CA

Average sunshine days in December - Campbell, CA
  • Average sunshine days in December: 19.8 days

The month with the most sunshine days is August (29.2 days).
The month with the least sunshine days is March (17.3 days).

Average UV index in December
Campbell, CA

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

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).

Average cloud cover in December
Campbell, CA

Average cloud cover in December - Campbell, 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 6).

Average visibility in December
Campbell, CA

Average visibility in December - Campbell, 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).

Campbell, California, USA

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