December weather forecast and climate
Placentia, CA

Weather in December

December, the first month of the winter, in Placentia, is also an enjoyable month, with average temperature ranging between min 50.2°F (10.1°C) and max 64.2°F (17.9°C).

Temperature

With an average high-temperature of 64.2°F (17.9°C) and an average low-temperature of 50.2°F (10.1°C), December is the coldest month.

Humidity

In Placentia, California, the average relative humidity in December is 54%.

Rainfall

The month with the most rainfall is December when the rain falls for 6.8 days and typically aggregates up to 1.65" (42mm) of precipitation.

Daylight

December has the shortest days of the year in Placentia, with an average of 9.9h of daylight.

Sunshine

February and December, with an average of 6.8h of sunshine, are months with the least sunshine in Placentia, California.

UV index

Months with the lowest UV index in Placentia, California, are January, February, November and December, with an average maximum UV index of 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from the exposure to the Sun's UV rays for average individuals.
Note: In December, the average maximum UV index of 4 translate into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the coldest month in Placentia?

With an average high-temperature of 64.2°F (17.9°C) and an average low-temperature of 50.2°F (10.1°C), December is the coldest month in Placentia.

What is the temperature in December in Placentia?

In December, in Placentia, the average high-temperature is 64.2°F (17.9°C), and the average low-temperature is 50.2°F (10.1°C).

What is the average humidity in December in Placentia?

In Placentia, California, the average relative humidity in December is 54%.

How many days does it rain in December in Placentia?

In Placentia, during December, the rain falls for 6.8 days and regularly aggregates up to 1.65" (42mm) of precipitation.

What is the rainiest month in Placentia?

The month with the most rainfall in Placentia, California, is December when the rain falls for 6.8 days and typically aggregates up to 1.65" (42mm) of precipitation.

What is the month with the shortest days in Placentia?

With an average of 9.9h of daylight, December has the shortest days of the year in Placentia.

How many hours of daylight does Placentia have in December?

In Placentia, California, the average length of the day in December is 9.9h.

What is the month with the least sunshine in Placentia?

Months with the least sunshine are February and December, with an average of 6.8h of sunshine.

How long on average sun shines in December in Placentia?

In December, the average sunshine in Placentia is 6.8h.

When is the lowest UV index in Placentia?

January, February, November and December, with an average maximum UV index of 4, are months with the lowest UV index in Placentia.

What is the UV index reading in December in Placentia?

The average daily maximum UV index in December is 4. A UV Index reading of 3 to 5 represents a medium hazard to health from the exposure to the Sun's UV rays.

Average temperature in December
Placentia, CA

Average temperature in December - Placentia, CA
  • Average high temperature in December: 64.2°F

The warmest month (with the highest average high temperature) is August (85.3°F).
The month with the lowest average high temperature is December (64.2°F).

  • Average low temperature in December: 50.2°F

The month with the highest average low temperature is August (65.7°F).
The coldest month (with the lowest average low temperature) is February (49.6°F).

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Average pressure in December
Placentia, CA

Average pressure in December - Placentia, CA
  • Average pressure in December: 30.07"

The month with the highest atmospheric pressure is January (30.1").
The month with the lowest atmospheric pressure is June (29.88").

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Average wind speed in December
Placentia, CA

Average wind speed in December - Placentia, CA
  • Average wind speed in December: 5mph

The windiest month (with the highest average wind speed) is April (5.8mph).
The calmest month (with the lowest average wind speed) is September (4.5mph).

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Average humidity in December
Placentia, CA

Average humidity in December - Placentia, CA
  • Average humidity in December: 54%

The month with the highest relative humidity is June (63%).
The month with the lowest relative humidity is November (50%).

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Average rainfall in December
Placentia, CA

Average rainfall in December - Placentia, CA
  • Average rainfall in December: 1.65"

The wettest month (with the highest rainfall) is December (1.65").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days in December
Placentia, CA

Average rainfall days in December - Placentia, CA
  • Average rainfall days in December: 6.8 days

The month with the highest number of rainy days is March (7.4 days).
The month with the least rainy days is June (1.4 days).

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

Average daylight in December / Average sunshine in December - Placentia, CA
  • Average daylight in December: 9.9h

The month with the longest days is June (Average daylight: 14.4h).
The month with the shortest days is December (Average daylight: 9.9h).

  • Average sunshine in December: 6.8h

The month with the most sunshine is July (Average sunshine: 12.1h).
Months with the least sunshine are February and December (Average sunshine: 6.8).

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Average sunshine days in December
Placentia, CA

Average sunshine days in December - Placentia, CA
  • Average sunshine days in December: 23.4 days

The month with the most sunshine days is August (26.7 days).
The month with the least sunshine days is February (20.7 days).

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Average UV index in December
Placentia, CA

Average UV index in December - Placentia, CA
  • Average UV index in December: 4

Months with the highest UV index are June, July, August and September (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 4).

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Average cloud cover in December
Placentia, CA

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

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).

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Average visibility in December
Placentia, CA

Average visibility in December - Placentia, CA
  • Average visibility in December: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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