December weather forecast and climate
Pasadena, CA

Pasadena City Hall in California, with neon-lit paths and natural gardens, under a perfect blue night sky
Pasadena City Hall in California, with neon-lit paths and natural gardens, under a perfect blue night sky

Weather in December

The first month of the winter, December, is still a comfortable month in Pasadena, California, with average temperature ranging between max 61.7°F (16.5°C) and min 46.8°F (8.2°C).

Temperature

With an average high-temperature of 61.7°F (16.5°C) and an average low-temperature of 46.8°F (8.2°C), December is the coldest month.

Humidity

The average relative humidity in Pasadena is 52%.

Rainfall

In Pasadena, during December, the rain falls for 6.1 days and regularly aggregates up to 1.65" (42mm) of precipitation. Throughout the year, in Pasadena, there are 50.1 rainfall days, and 8.5" (216mm) of precipitation is accumulated.

Daylight

The month with the shortest days is December, with an average of 9.9h of daylight.

Sunshine

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

UV index

With an average maximum UV index of 3, December is the month with the lowest UV index in Pasadena. A UV Index of 3 to 5 symbolizes a medium health hazard from the exposure to the Sun's UV radiation for ordinary individuals.
Note: The average daily UV index of 3 transform into the following instructions:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the coldest month in Pasadena?

The coldest month in Pasadena is December, with an average high-temperature of 61.7°F (16.5°C) and an average low-temperature of 46.8°F (8.2°C).

What is the temperature in December in Pasadena?

The average high-temperature, in December, in Pasadena, California, is 61.7°F (16.5°C), while the average low-temperature is 46.8°F (8.2°C).

What is the average humidity in December in Pasadena?

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

How much does it rain in Pasadena in December?

In Pasadena, California, in December, it is raining for 6.1 days, with typically 1.65" (42mm) of accumulated precipitation.

What is the month with the shortest days in Pasadena?

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

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

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

What is the month with the least sunshine in Pasadena?

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

How many hours of sunshine does Pasadena have in December?

In December, the average sunshine in Pasadena, California, is 6.9h.

What is the month with the lowest UV index in Pasadena?

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

What is the UV index intensity in December in Pasadena?

In Pasadena, California, the average daily maximum UV index in December is 3. A UV Index reading of 3 to 5 represents a moderate vulnerability from unsafe exposure to the Sun's UV rays.

Average temperature in December
Pasadena, CA

Average temperature in December - Pasadena, CA
  • Average high temperature in December: 61.7°F

The warmest month (with the highest average high temperature) is August (87.1°F).
The month with the lowest average high temperature is December (61.7°F).

  • Average low temperature in December: 46.8°F

The month with the highest average low temperature is August (64.9°F).
The coldest month (with the lowest average low temperature) is February (46.6°F).

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Average pressure in December
Pasadena, CA

Average pressure in December - Pasadena, CA
  • Average pressure in December: 30.08"

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

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Average wind speed in December
Pasadena, CA

Average wind speed in December - Pasadena, 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).

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Average humidity in December
Pasadena, CA

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

The month with the highest relative humidity is June (58%).
The month with the lowest relative humidity is November (47%).

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Average rainfall in December
Pasadena, CA

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

The wettest month (with the highest rainfall) is February (1.77").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days in December
Pasadena, CA

Average rainfall days in December - Pasadena, CA
  • Average rainfall days in December: 6.1 days

The month with the highest number of rainy days is March (7.8 days).
The month with the least rainy days is June (1.1 days).

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

Average daylight in December / Average sunshine in December - Pasadena, 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: 6.9h

Months with the most sunshine are June and July (Average sunshine: 12.1h).
Months with the least sunshine are January, February and December (Average sunshine: 6.9).

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Average sunshine days in December
Pasadena, CA

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

The month with the most sunshine days is June (27.5 days).
The month with the least sunshine days is February (21.5 days).

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Average UV index in December
Pasadena, CA

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

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).

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Average cloud cover in December
Pasadena, CA

Average cloud cover in December - Pasadena, CA
  • Average cloud cover in December: 21

Months with the most cloud cover are March and December (Cloud cover 21).
The month with the least cloud cover is August (Cloud cover 5).

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Average visibility in December
Pasadena, CA

Average visibility in December - Pasadena, 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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