December weather forecast
Tustin, CA

Weather in December

The first month of the winter, December, is also an enjoyable month in Tustin, California, with an average temperature fluctuating between 63.1°F (17.3°C) and 51.3°F (10.7°C).

Temperature

With an average high-temperature of 63.1°F (17.3°C) and an average low-temperature of 51.3°F (10.7°C), December is the coldest month.

Humidity

The average relative humidity in December is 59%.

Rainfall

The month with the most rainfall is December, when the rain falls for 6.5 days and typically aggregates up to 0.87" (22mm) of precipitation.

Daylight

With an average of 9h and 58min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 6:38 am and sunset at 4:42 pm. On the last day of December, in Tustin, sunrise is at 6:55 am and sunset at 4:53 pm PST.

Sunshine

With an average of 6.7h of sunshine, December has the least sunshine of the year in Tustin.

UV index

January through March, November and December, with an average maximum UV index of 4, are months with the lowest UV index in Tustin. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for average individuals.
Note: The average daily UV index of 4 in December transform into the following instructions:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the coldest month in Tustin?

The coldest month in Tustin, California, is December, with an average high-temperature of 63.1°F (17.3°C) and an average low-temperature of 51.3°F (10.7°C).

What is the average humidity in December in Tustin?

The average relative humidity in December in Tustin, California, is 59%.

What is the wettest month in Tustin?

The month with the most rainfall in Tustin is December, when the rain falls for 6.5 days and typically aggregates up to 0.87" (22mm) of precipitation.

How much does it rain in Tustin in December?

In Tustin, California, in December, during 6.5 rainfall days, 0.87" (22mm) of precipitation is typically accumulated.

What is the month with the shortest days in Tustin?

With an average of 9h and 58min of daylight, December has the shortest days of the year.

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

In December, the average day length is 9h and 58min.

What time are sunrise and sunset in December in Tustin?

On the first day of December in Tustin, sunrise is at 6:38 am and sunset at 4:42 pm. On the last day of the month, sunrise is at 6:55 am and sunset at 4:53 pm PST.

What is the month with the least sunshine in Tustin?

The month with the least sunshine is December, with an average of 6.7h of sunshine.

How long on average sun shines in December in Tustin?

In December, the average sunshine duration in Tustin, California, is 6.7h.

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

January through March, November and December, with an average maximum UV index of 4, are months with the lowest UV index in Tustin, California.

How high is the UV index in December in Tustin?

In Tustin, California, the average daily maximum UV index in December is 4. A UV Index value of 3 to 5 symbolizes a medium health risk from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Tustin, CA

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

The warmest month (with the highest average high temperature) is August (80.2°F).
The month with the lowest average high temperature is December (63.1°F).

  • Average low temperature in December: 51.3°F

The month with the highest average low temperature is August (65.1°F).
The coldest month (with the lowest average low temperature) is February (50.7°F).

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Average pressure in December
Tustin, CA

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

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

The windiest months (with the highest average wind speed) are April and May (6mph).
The calmest months (with the lowest average wind speed) are August, September and October (4.8mph).

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Average humidity in December
Tustin, CA

Average humidity in December - Tustin, CA
  • Average humidity in December: 59%

The month with the highest relative humidity is June (70%).
The month with the lowest relative humidity is November (55%).

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Average rainfall in December
Tustin, CA

Average rainfall in December - Tustin, CA
  • Average rainfall in December: 0.87"

The wettest month (with the highest rainfall) is December (0.87").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days in December
Tustin, CA

Average rainfall days in December - Tustin, CA
  • Average rainfall days in December: 6.5 days

The month with the highest number of rainy days is March (6.7 days).
The month with the least rainy days is June (1.3 days).

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

Average daylight in December / Average sunshine in December - Tustin, CA
  • Average daylight in December: 9h and 58min

The month with the longest days is June (Average daylight: 14h and 22min).
The month with the shortest days is December (Average daylight: 9h and 58min).

  • Average sunshine in December: 6h and 42min

The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 42min).

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Average sunshine days in December
Tustin, CA

Average sunshine days in December - Tustin, CA
  • Average sunshine days in December: 23 days

The month with the most sunshine days is June (26.9 days).
The month with the least sunshine days is February (20.3 days).

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Average UV index in December
Tustin, CA

Average UV index in December - Tustin, 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, March, November and December (UV index 4).

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Average cloud cover in December
Tustin, CA

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

The months with the most cloud cover are March and December (Cloud cover 23).
The month with the least cloud cover is August (Cloud cover 6).

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Average visibility in December
Tustin, CA

Average visibility in December - Tustin, 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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