December weather forecast and climate
Highland, CA

Weather in December

December, the first month of the winter, in Highland, is still a mild month, with average temperature varying between 57.7°F (14.3°C) and 41.5°F (5.3°C).

Temperature

The coldest month is December, with an average high-temperature of 57.7°F (14.3°C) and an average low-temperature of 41.5°F (5.3°C).

Humidity

The average relative humidity in December is 51%.

Rainfall

The month with the most rainfall is December when the rain falls for 6.8 days and typically aggregates up to 1.42" (36mm) of precipitation.

Snowfall

January, March through December are months without snowfall.

Daylight

With an average of 9.9h of daylight, December has the shortest days of the year in Highland.

Sunshine

December has the least sunshine of the year in Highland, California, with an average of 6.9h of sunshine.

UV index

November and December, with an average maximum UV index of 3, are months with the lowest UV index. A UV Index of 3 to 5 symbolizes a moderate health risk from unsafe exposure to the UV radiation for the ordinary person.
Note: The daily maximum UV index of 3 interpret into the following advice:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the coldest month in Highland?

With an average high-temperature of 57.7°F (14.3°C) and an average low-temperature of 41.5°F (5.3°C), December is the coldest month.

What is the temperature in December in Highland?

In Highland, in December, the average high-temperature is 57.7°F (14.3°C), and the average low-temperature is 41.5°F (5.3°C).

What is the average humidity in December in Highland?

In Highland, the average relative humidity in December is 51%.

How much does it rain in Highland in December?

In Highland, California, during December, the rain falls for 6.8 days and regularly aggregates up to 1.42" (36mm) of precipitation.

What is the wettest month in Highland?

December is the month with the most rainfall in Highland, California. Rain falls for 6.8 days and accumulates 1.42" (36mm) of precipitation.

When it does not snow in Highland?

In Highland, California, snow does not fall in January, March through December.

What is the month with the shortest days in Highland?

December has the shortest days of the year in Highland, with an average of 9.9h of daylight.

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

The average length of the day in December in Highland is 9.9h.

What is the month with the least sunshine in Highland?

With an average of 6.9h of sunshine, December has the least sunshine of the year.

How long on average sun shines in December in Highland?

In December, the average sunshine in Highland, California, is 6.9h.

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

Months with the lowest UV index in Highland are November and December, with an average maximum UV index of 3.

How high is the UV index in December in Highland?

The average daily maximum UV index in December in Highland, California, is 3. A UV Index estimate of 3 to 5 represents a moderate vulnerability from unsafe exposure to the Sun's UV rays.

Average temperature in December
Highland, CA

Average temperature in December - Highland, CA
  • Average high temperature in December: 57.7°F

The warmest month (with the highest average high temperature) is August (90.9°F).
The month with the lowest average high temperature is December (57.7°F).

  • Average low temperature in December: 41.5°F

The month with the highest average low temperature is August (66.6°F).
The coldest months (with the lowest average low temperature) are February and December (41.5°F).

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Average pressure in December
Highland, CA

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

The month with the highest atmospheric pressure is January (30.1").
The month with the lowest atmospheric pressure is June (29.84").

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Average wind speed in December
Highland, CA

Average wind speed in December - Highland, CA
  • Average wind speed in December: 5.4mph

The windiest month (with the highest average wind speed) is April (6.6mph).
The calmest month (with the lowest average wind speed) is September (4.8mph).

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Average humidity in December
Highland, CA

Average humidity in December - Highland, CA
  • Average humidity in December: 51%

The month with the highest relative humidity is February (52%).
The month with the lowest relative humidity is August (36%).

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Average rainfall in December
Highland, CA

Average rainfall in December - Highland, CA
  • Average rainfall in December: 1.42"

The wettest month (with the highest rainfall) is December (1.42").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days in December
Highland, CA

Average rainfall days in December - Highland, CA
  • Average rainfall days in December: 6.8 days

The month with the highest number of rainy days is March (7.3 days).
The month with the least rainy days is June (1.3 days).

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Average snowfall days in December
Highland, CA

Average snowfall days in December - Highland, CA
  • Average snowfall days in December: 0 days

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

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

Average daylight in December / Average sunshine in December - Highland, CA
  • Average daylight in December: 9.9h

The month with the longest days is June (Average daylight: 14.4h).
The month with the shortest days is December (Average daylight: 9.9h).

  • Average sunshine in December: 6.9h

The month with the most sunshine is July (Average sunshine: 12.2h).
The month with the least sunshine is December (Average sunshine: 6.9h).

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Average sunshine days in December
Highland, CA

Average sunshine days in December - Highland, CA
  • Average sunshine days in December: 22.9 days

The month with the most sunshine days is June (28.5 days).
The month with the least sunshine days is February (20.9 days).

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Average UV index in December
Highland, CA

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

The month with the highest UV index is July (UV index 7).
Months with the lowest UV index are November and December (UV index 3).

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Average cloud cover in December
Highland, CA

Average cloud cover in December - Highland, CA
  • Average cloud cover in December: 21

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).

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Average visibility in December
Highland, CA

Average visibility in December - Highland, CA
  • Average visibility in December: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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