December weather forecast
South Pasadena, CA

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Weather in December

December, the first month of the winter in South Pasadena, is still a comfortable month, with an average temperature ranging between max 63.1°F (17.3°C) and min 47.8°F (8.8°C).

Temperature

The coldest time of the year is December, with temperatures averaging a high of 63.1°F (17.3°C) and a low of 47.8°F (8.8°C).

Humidity

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

Rainfall

In South Pasadena, in December, it is raining for 6 days, with typically 1.65" (42mm) of accumulated precipitation. Throughout the year, in South Pasadena, there are 49.2 rainfall days, and 8.23" (209mm) of precipitation is accumulated.

Snowfall

December is the only month when snow falls in South Pasadena. December has the most snowfall days of the year. Snow falls for 0.1 days.

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 4:43 pm. On the last day of December, sunrise is at 6:58 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 in South Pasadena.

UV index

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for the average person.
Note: A maximum UV index of 4 in December translates into the following recommendations:
Exercise prevention - Precautions against solar damage are endorsed. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation. Notice this! Nearly double the intensity of the Sun's UV radiation can be caused by snow reflection.
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Frequently asked questions

What is the coldest time of year in South Pasadena?

In South Pasadena, the average lowest temperatures are observed in December, with a high of 63.1°F (17.3°C) and a low of 47.8°F (8.8°C).

What is the usual temperature for South Pasadena in December?

In December, in South Pasadena, the average high-temperature is 63.1°F (17.3°C), and the average low-temperature is 47.8°F (8.8°C). In September, the average heat index (a.k.a. 'apparent temperature', 'feels like'), which calculates the temperature value influenced by the moisture in the air, is calculated to be 86°F (30°C).

What is the average humidity in December in South Pasadena?

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

How many days does it rain in December in South Pasadena?

In December, the rain falls for 6 days. Throughout December, 1.65" (42mm) of precipitation is accumulated.

What is the snowiest month in South Pasadena?

December has the most snowfall days of the year. Snow falls for 0.1 days.

When does it start to snow in South Pasadena?

December is the first month it typically snows in South Pasadena. Throughout December, there are 0.1 snowfall days.

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

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

How many hours of daylight does South Pasadena have in December?

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

When is the sunrise / sunset in December in South Pasadena?

On the first day of December in South Pasadena, sunrise is at 6:40 am and sunset at 4:43 pm. On the last day of the month, sunrise is at 6:58 am and sunset at 4:53 pm PST.

What are the months with the least sunshine in South Pasadena?

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

How many hours of sunshine does South Pasadena have in December?

The average sunshine duration in December in South Pasadena, California, is 6.9h.

When is the lowest UV index in South Pasadena?

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

How high is the UV index in December in South Pasadena?

The average daily maximum UV index in December is 4. A UV Index estimate of 3 to 5 represents a moderate health threat from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
South Pasadena, CA

Average temperature in December - South Pasadena, CA
  • Average high temperature in December: 63.1°F

The warmest month (with the highest average high temperature) is August (86.7°F).
The month with the lowest average high temperature is December (63.1°F).

  • Average low temperature in December: 47.8°F

The month with the highest average low temperature is August (65.7°F).
The coldest months (with the lowest average low temperature) are February and December (47.8°F).

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Average pressure in December
South Pasadena, CA

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

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

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Average wind speed in December
South Pasadena, CA

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

The windiest month (with the highest average wind speed) is April (5.7mph).
The calmest month (with the lowest average wind speed) is September (4.4mph).

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Average humidity in December
South Pasadena, CA

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

The month with the highest relative humidity is June (59%).
The month with the lowest relative humidity is November (47%).

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Average rainfall in December
South Pasadena, CA

Average rainfall in December - South 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
South Pasadena, CA

Average rainfall days in December - South Pasadena, CA
  • Average rainfall days in December: 6 days

The month with the highest number of rainy days is March (7.7 days).
The month with the least rainy days is June (1 days).

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Average snowfall days in December
South Pasadena, CA

Average snowfall days in December - South Pasadena, CA
  • Average snowfall days in December: 0.1 days

The month with the highest number of snowfall days is December (0.1 days).
The months with the least snowfall days are January, February, March, April, May, June, July, August, September, October and November (0 days).

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

Average daylight in December / Average sunshine in December - South 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).

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Average sunshine days in December
South Pasadena, CA

Average sunshine days in December - South Pasadena, CA
  • Average sunshine days in December: 23.5 days

The month with the most sunshine days is August (28.3 days).
The month with the least sunshine days is February (21 days).

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Average UV index in December
South Pasadena, CA

Average UV index in December - South Pasadena, CA
  • Average UV index in December: 4

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

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Average cloud cover in December
South Pasadena, CA

Average cloud cover in December - South 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 4).

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Average visibility in December
South Pasadena, CA

Average visibility in December - South 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).

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South Pasadena, California, USA

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