December weather forecast
Arcadia, CA

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Weather in December

The first month of the winter, December, is still a comfortable month in Arcadia, California, with an average temperature varying between 62.1°F (16.7°C) and 46.2°F (7.9°C).

Temperature

December, known for its average high temperature of 62.1°F (16.7°C) and an average low temperature of 46.2°F (7.9°C), is the coldest month.

Humidity

In Arcadia, California, the average relative humidity in December is 52%.

Rainfall

The month with the most rainfall is December, when the rain falls for 5.8 days and typically aggregates up to 1.54" (39mm) of precipitation.

Daylight

The month with the shortest days is December, with an average of 9h and 54min of daylight.
On the first day of the month, sunrise is at 6:40 am and sunset at 4:42 pm. On the last day of December, sunrise is at 6:57 am and sunset at 4:53 pm PST.

Sunshine

January, February and December, with an average of 6.9h of sunshine, are months with the least sunshine.

UV index

With an average maximum UV index of 3, December is the month with the lowest UV index. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the average person.
Note: In December, the maximum UV index of 3 suggests these recommendations:
Undertake precautions - Guarding against sun damage is counselled. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. To cut down UV radiation exposure by about half, sport a wide-brim hat.

Frequently asked questions

What is the coldest month?

December is the coldest month of the year, registering average temperatures as high as 62.1°F (16.7°C) and as low as 46.2°F (7.9°C).

What is the average December temperature?

December temperatures vary between a high-temperature of 62.1°F (16.7°C) and a low-temperature of 46.2°F (7.9°C). In September, the average heat index (a.k.a. 'real feel', 'feels like'), which factors the actual air temperature with the relative humidity, is calculated to be 86°F (30°C).

What is the average humidity in December?

The average relative humidity in December in Arcadia is 52%.

What is the wettest month?

The month with the most rainfall is December, when the rain falls for 5.8 days and typically aggregates up to 1.54" (39mm) of precipitation.

How much does it rain in December?

In Arcadia, in December, during 5.8 rainfall days, 1.54" (39mm) of precipitation is typically accumulated.

What is the month with the shortest days?

The month with the shortest days in Arcadia is December, with an average of 9h and 54min of daylight.

How many hours of daylight does Arcadia have in December?

In December, the average day length is 9h and 55min.

What time are sunrise and sunset in December?

On the first day of December, sunrise is at 6:40 am and sunset at 4:42 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 4:53 pm PST.

What is the month with the least sunshine?

January, February and December, with an average of 6.9h of sunshine, are months with the least sunshine.

How many hours of sunshine does Arcadia have in December?

In December, the average sunshine duration is 6.9h.

What is the month with the lowest UV index?

With an average maximum UV index of 3, December is the month with the lowest UV index.

What is the UV index reading in December?

In Arcadia, the average daily maximum UV index in December is 3. A UV Index estimate 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
Arcadia, CA

Average temperature in December - Arcadia, CA
  • Average high temperature in December: 62.1°F

The warmest month (with the highest average high temperature) is August (88.2°F).
The month with the lowest average high temperature is December (62.1°F).

  • Average low temperature in December: 46.2°F

The month with the highest average low temperature is August (64.8°F).
The coldest month (with the lowest average low temperature) is December (46.2°F).

Average pressure in December
Arcadia, CA

Average pressure in December - Arcadia, CA
  • Average pressure in December: 30.08"Hg

The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).

Average wind speed in December
Arcadia, CA

Average wind speed in December - Arcadia, CA
  • Average wind speed in December: 5.2mph

The windiest month (with the highest average wind speed) is April (5.8mph).
The calmest month (with the lowest average wind speed) is September (4.4mph).

Average humidity in December
Arcadia, CA

Average humidity in December - Arcadia, CA
  • Average humidity in December: 52%

The months with the highest relative humidity are March, May and June (56%).
The month with the lowest relative humidity is November (46%).

Average rainfall in December
Arcadia, CA

Average rainfall in December - Arcadia, CA
  • Average rainfall in December: 1.54"

The wettest month (with the highest rainfall) is December (1.54").
The driest month (with the least rainfall) is June (0.04").

Average rainfall days in December
Arcadia, CA

Average rainfall days in December - Arcadia, CA
  • Average rainfall days in December: 5.8 days

The month with the highest number of rainy days is March (6.5 days).
The month with the least rainy days is June (1.3 days).

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

Average daylight in December / Average sunshine in December - Arcadia, CA
  • Average daylight in December: 9h and 5min

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).

  • Average sunshine in December: 6h and 5min

The month with the most sunshine is July (Average sunshine: 12h and 6min).
The months with the least sunshine are January, February and December (Average sunshine: 6h and 54min).

Average sunshine days in December
Arcadia, CA

Average sunshine days in December - Arcadia, CA
  • Average sunshine days in December: 23.8 days

The month with the most sunshine days is June (27.7 days).
The month with the least sunshine days is February (22 days).

Average UV index in December
Arcadia, CA

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

The months with the highest UV index are June, July, August and September (UV index 6).
The month with the lowest UV index is December (UV index 3).

Average cloud cover in December
Arcadia, CA

Average cloud cover in December - Arcadia, CA
  • Average cloud cover in December: 22

The months with the most cloud cover are March and December (Cloud cover 22).
The month with the least cloud cover is August (Cloud cover 5).

Average visibility in December
Arcadia, CA

Average visibility in December - Arcadia, 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).

Arcadia, California, USA

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