December weather forecast
East Pasadena, CA

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Weather in December

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

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

Rainfall

In December, the rain falls for 6.1 days. Throughout December, 1.65" (42mm) of precipitation is accumulated. In East Pasadena, during the entire year, the rain falls for 50.1 days and collects up to 8.5" (216mm) of precipitation.

Daylight

With an average of 9h and 54min of daylight, December has the shortest days of the year.
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

December is the month with the lowest UV index, with an average maximum UV index of 3. A UV Index estimate of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for average individuals.
Note: The UV index of 3 during December translates into the following guidance:
Heed the precautions - Protecting the skin and eyes from damage is compulsory. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage.
Updated: Aug 15, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What time of the year is the coldest?

December is East Pasadena's coldest month, registering average high temperatures of 61.7°F (16.5°C) and lows of 46.8°F (8.2°C).

What are the temperatures in December?

The average high-temperature and low-temperature during December are 61.7°F (16.5°C) and 46.8°F (8.2°C) respectively. The average heat index (a.k.a. 'real feel', 'felt air temperature'), which combines relative humidity and air temperature, in September is evaluated at 86°F (30°C).

What is the average humidity in December?

The average relative humidity in December is 52%.

How much does it rain in December?

In December, the rain falls for 6.1 days. Throughout December, 1.65" (42mm) of precipitation is accumulated.

What is the month with the shortest days in East Pasadena?

With an average of 9h and 54min of daylight, December has the shortest days of the year in East Pasadena.

What is the average length of the day in December?

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

When is the sunrise / sunset in December?

In December, on the first day of the month, 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 are the months with the least sunshine?

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

How long on average sun shines in December?

The average sunshine duration in December is 6.9h.

What is the month with the lowest UV index?

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 December, the average daily maximum UV index is 3. A UV Index reading of 3 to 5 represents a medium health risk 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
East Pasadena, CA

Average temperature in December - East 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).

Average pressure in December
East Pasadena, CA

Average pressure in December - East Pasadena, 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
East Pasadena, CA

Average wind speed in December - East 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).

Average humidity in December
East Pasadena, CA

Average humidity in December - East 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%).

Average rainfall in December
East Pasadena, CA

Average rainfall in December - East 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").

Average rainfall days in December
East Pasadena, CA

Average rainfall days in December - East 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).

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

Average daylight in December / Average sunshine in December - East Pasadena, 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 months with the most sunshine are June and 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
East Pasadena, CA

Average sunshine days in December - East 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).

Average UV index in December
East Pasadena, CA

Average UV index in December - East Pasadena, 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
East Pasadena, CA

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

The 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).

Average visibility in December
East Pasadena, CA

Average visibility in December - East Pasadena, 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).

East Pasadena, California, USA

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