December weather forecast
Summerland, CA

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Weather in December

The first month of the winter, December, is still a refreshing month in Summerland, California, with an average temperature varying between 46.4°F (8°C) and 59.4°F (15.2°C).

Temperature

Summerland's December weather, with an average high temperature of 59.4°F (15.2°C) and an average low temperature of 46.4°F (8°C), tends to be the coldest of the year.

Humidity

In Summerland, the average relative humidity in December is 58%.

Rainfall

In Summerland, in December, it is raining for 5.5 days, with typically 1.38" (35mm) of accumulated precipitation. Throughout the year, in Summerland, there are 46.9 rainfall days, and 7.83" (199mm) of precipitation is accumulated.

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 6:47 am and sunset at 4:48 pm. On the last day of December, sunrise is at 7:04 am and sunset at 4:58 pm PST.

Sunshine

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

UV index

With an average maximum UV index of 3, December is the month with the lowest UV index. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for the ordinary person.
Note: In December, a daily UV index of 3 turns into the following recommendations:
Take heed. Individuals of lighter complexion can be burned in less than half an hour. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. To cut down UV radiation exposure by about half, sport a wide-brim hat.
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Frequently asked questions

What is the coldest time of year in Summerland?

In Summerland, December is the month with the lowest recorded average temperatures, measuring a high of 59.4°F (15.2°C) and a low of 46.4°F (8°C).

What is the average December temperature in Summerland?

The high-temperature, in December, in Summerland, is 59.4°F (15.2°C), while the low-temperature averages to 46.4°F (8°C).

What is the average humidity in December in Summerland?

The average relative humidity in December is 58%.

How much does it rain in Summerland in December?

In Summerland, in December, it is raining for 5.5 days, with typically 1.38" (35mm) of accumulated precipitation.

What is the month with the shortest days in Summerland?

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

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

In December, the average day length is 9h and 54min.

When are sunrise and sunset in December in Summerland?

On the first day of December, sunrise is at 6:47 am and sunset at 4:48 pm. On the last day of the month, sunrise is at 7:04 am and sunset at 4:58 pm PST.

How long on average sun shines in December in Summerland?

In December, the average sunshine duration in Summerland, California, is 6.8h.

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

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

What is the UV index intensity in December in Summerland?

In Summerland, California, the average daily maximum UV index in December is 3. A UV Index reading of 3 to 5 represents a medium hazard to health 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
Summerland, CA

Average temperature in December - Summerland, CA
  • Average high temperature in December: 59.4°F

The warmest month (with the highest average high temperature) is August (79.2°F).
The month with the lowest average high temperature is December (59.4°F).

  • Average low temperature in December: 46.4°F

The month with the highest average low temperature is August (61.3°F).
The coldest month (with the lowest average low temperature) is February (45.3°F).

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Average pressure in December
Summerland, CA

Average pressure in December - Summerland, 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 September (29.9"Hg).

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Average wind speed in December
Summerland, CA

Average wind speed in December - Summerland, CA
  • Average wind speed in December: 6.2mph

The windiest month (with the highest average wind speed) is April (7mph).
The calmest month (with the lowest average wind speed) is August (4.5mph).

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Average humidity in December
Summerland, CA

Average humidity in December - Summerland, CA
  • Average humidity in December: 58%

The month with the highest relative humidity is March (63%).
The months with the lowest relative humidity are October and November (53%).

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Average rainfall in December
Summerland, CA

Average rainfall in December - Summerland, CA
  • Average rainfall in December: 1.38"

The wettest months (with the highest rainfall) are February and March (1.46").
The driest months (with the least rainfall) are June and August (0.12").

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Average rainfall days in December
Summerland, CA

Average rainfall days in December - Summerland, CA
  • Average rainfall days in December: 5.5 days

The month with the highest number of rainy days is March (6.8 days).
The month with the least rainy days is August (1.5 days).

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

Average daylight in December / Average sunshine in December - Summerland, 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 August (Average sunshine: 12h and 0min).
The month with the least sunshine is February (Average sunshine: 6h and 30min).

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Average sunshine days in December
Summerland, CA

Average sunshine days in December - Summerland, CA
  • Average sunshine days in December: 24.7 days

The month with the most sunshine days is August (27.3 days).
The month with the least sunshine days is February (21.8 days).

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Average UV index in December
Summerland, CA

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

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

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Average cloud cover in December
Summerland, CA

Average cloud cover in December - Summerland, CA
  • Average cloud cover in December: 23

The month with the most cloud cover is March (Cloud cover 24).
The month with the least cloud cover is August (Cloud cover 5).

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Average visibility in December
Summerland, CA

Average visibility in December - Summerland, 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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Summerland, California, USA

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