December weather forecast
Tracy, CA

Weather in December

December, the first month of the winter in Tracy, is still a cool month, with an average temperature fluctuating between 40.1°F (4.5°C) and 54.1°F (12.3°C).

Temperature

The coldest month is December, with an average high-temperature of 54.1°F (12.3°C) and an average low-temperature of 40.1°F (4.5°C).

Humidity

In December, the average relative humidity is 72%.

Rainfall

In Tracy, during December, the rain falls for 8.1 days and regularly aggregates up to 0.94" (24mm) of precipitation. In Tracy, California, during the entire year, the rain falls for 60.6 days and collects up to 5.71" (145mm) of precipitation.

Snowfall

December is the only month when snow falls. The month with the most snowfall days is December, when snow falls for 0.1 days.

Daylight

December has the shortest days of the year in Tracy, with an average of 9h and 36min of daylight.
On the first day of December in Tracy, sunrise is at 7:02 am and sunset at 4:47 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 4:56 pm PST.

Sunshine

The month with the least sunshine in Tracy, California, is December, with an average of 5.8h of sunshine.

UV index

January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for average individuals.
Note: The average daily UV index of 3 in December 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. 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the coldest month in Tracy?

The coldest month is December, with an average high-temperature of 54.1°F (12.3°C) and an average low-temperature of 40.1°F (4.5°C).

What is the temperature in December in Tracy?

The average high-temperature, in December, in Tracy, is 54.1°F (12.3°C), while the average low-temperature is 40.1°F (4.5°C). in September, the average heat index (a.k.a. 'feels like', 'real feel'), which represents the influence of relative humidity on air temperature, is estimated at 87.8°F (31°C).

What is the average humidity in December in Tracy?

The average relative humidity in December in Tracy, California, is 72%.

How much does it rain in Tracy in December?

In Tracy, in December, it is raining for 8.1 days, with typically 0.94" (24mm) of accumulated precipitation.

What is the snowiest month in Tracy?

The month with the most snowfall days in Tracy, California, is December, when snow falls for 0.1 days.

When does it start snowing in Tracy?

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

What is the month with the shortest days in Tracy?

December has the shortest days of the year in Tracy, with an average of 9h and 36min of daylight.

How many hours of daylight does Tracy have in December?

In Tracy, California, the average day length in December is 9h and 36min.

When are sunrise and sunset in December in Tracy?

On the first day of December in Tracy, California, sunrise is at 7:02 am and sunset at 4:47 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 4:56 pm PST.

What is the month with the least sunshine in Tracy?

With an average of 5.8h of sunshine, December has the least sunshine of the year in Tracy, California.

How long on average sun shines in December in Tracy?

The average sunshine duration in December is 5.8h.

What are the months with the lowest UV index in Tracy?

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 3.

How high is the UV index in December in Tracy?

The average daily maximum UV index in December is 3. A UV Index estimate of 3 to 5 represents a medium hazard to health from unprotected exposure to UV radiation.
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
Tracy, CA

Average temperature in December - Tracy, CA
  • Average high temperature in December: 54.1°F

The warmest month (with the highest average high temperature) is July (92.5°F).
The month with the lowest average high temperature is December (54.1°F).

  • Average low temperature in December: 40.1°F

The month with the highest average low temperature is August (58.6°F).
The coldest months (with the lowest average low temperature) are January and December (40.1°F).

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Average pressure in December
Tracy, CA

Average pressure in December - Tracy, CA
  • Average pressure in December: 30.11"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed in December
Tracy, CA

Average wind speed in December - Tracy, CA
  • Average wind speed in December: 5.1mph

The windiest month (with the highest average wind speed) is June (7.1mph).
The calmest month (with the lowest average wind speed) is November (4.5mph).

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Average humidity in December
Tracy, CA

Average humidity in December - Tracy, CA
  • Average humidity in December: 72%

The month with the highest relative humidity is January (74%).
The month with the lowest relative humidity is July (45%).

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Average rainfall in December
Tracy, CA

Average rainfall in December - Tracy, CA
  • Average rainfall in December: 0.94"

The wettest month (with the highest rainfall) is March (1.06").
The driest months (with the least rainfall) are June and August (0.08").

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Average rainfall days in December
Tracy, CA

Average rainfall days in December - Tracy, CA
  • Average rainfall days in December: 8.1 days

The month with the highest number of rainy days is March (10.6 days).
The month with the least rainy days is August (1.2 days).

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Average snowfall days in December
Tracy, CA

Average snowfall days in December - Tracy, 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
Tracy, CA

Average daylight in December / Average sunshine in December - Tracy, CA
  • Average daylight in December: 9h and 36min

The month with the longest days is June (Average daylight: 14h and 44min).
The month with the shortest days is December (Average daylight: 9h and 36min).

  • Average sunshine in December: 5h and 48min

The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).

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Average sunshine days in December
Tracy, CA

Average sunshine days in December - Tracy, CA
  • Average sunshine days in December: 21.5 days

The month with the most sunshine days is August (28.6 days).
The month with the least sunshine days is March (18.4 days).

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Average UV index in December
Tracy, CA

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

The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 3).

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Average cloud cover in December
Tracy, CA

Average cloud cover in December - Tracy, CA
  • Average cloud cover in December: 35

The month with the most cloud cover is March (Cloud cover 36).
The months with the least cloud cover are July and August (Cloud cover 5).

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Average visibility in December
Tracy, CA

Average visibility in December - Tracy, 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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