December weather forecast and climate
Glendora, CA

The beautiful city of Glendora, California, surrounded by the vast mountain ranges
The beautiful city of Glendora, California, surrounded by the vast mountain ranges

Weather in December

The first month of the winter, December, is still a comfortable month in Glendora, California, with average temperature fluctuating between 45.5°F (7.5°C) and 61.5°F (16.4°C).

Temperature

December is the coldest month, with an average high-temperature of 61.5°F (16.4°C) and an average low-temperature of 45.5°F (7.5°C).

Humidity

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

Rainfall

In December, in Glendora, the rain falls for 4.7 days. Throughout December, 1.65" (42mm) of precipitation is accumulated. In Glendora, during the entire year, the rain falls for 44.9 days and collects up to 7.76" (197mm) of precipitation.

Snowfall

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

Daylight

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

Sunshine

In Glendora, the average sunshine is 7h.

UV index

December is the month with the lowest UV index in Glendora, with an average maximum UV index of 3. A UV Index estimate of 3 to 5 represents a medium health hazard from unprotected exposure to the Sun's UV rays for the average person.
Note: In December, the average maximum UV index of 3 translate into the following recommendations:
Take precautions - Protection against the skin and eye damage is obliged. 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 Glendora?

The coldest month in Glendora is December, with an average high-temperature of 61.5°F (16.4°C) and an average low-temperature of 45.5°F (7.5°C).

What is the temperature in December in Glendora?

In December, the average high-temperature is 61.5°F (16.4°C), and the average low-temperature is 45.5°F (7.5°C).

What is the average humidity in December in Glendora?

The average relative humidity in December in Glendora, California, is 51%.

How much does it rain in Glendora in December?

In Glendora, in December, it is raining for 4.7 days, with typically 1.65" (42mm) of accumulated precipitation.

When it does not snow in Glendora?

January, March through December are months without snowfall in Glendora.

What is the month with the shortest days in Glendora?

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

How many hours of daylight does Glendora have in December?

In December, the average length of the day in Glendora is 9.9h.

How many hours of sunshine does Glendora have in December?

In Glendora, California, the average sunshine in December is 7h.

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

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

What is the UV index intensity in December in Glendora?

In December, the average daily maximum UV index in Glendora, California, is 3. A UV Index of 3 to 5 symbolizes a medium hazard to health from unsafe exposure to the Sun's UV rays.

Average temperature in December
Glendora, CA

Average temperature in December - Glendora, CA
  • Average high temperature in December: 61.5°F

The warmest month (with the highest average high temperature) is August (88.7°F).
The month with the lowest average high temperature is December (61.5°F).

  • Average low temperature in December: 45.5°F

The month with the highest average low temperature is August (65.7°F).
The coldest month (with the lowest average low temperature) is December (45.5°F).

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Average pressure in December
Glendora, CA

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

The month with the highest atmospheric pressure is January (30.11").
The month with the lowest atmospheric pressure is June (29.87").

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Average wind speed in December
Glendora, CA

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

The windiest months (with the highest average wind speed) are April and May (5.8mph).
The calmest month (with the lowest average wind speed) is September (4.4mph).

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Average humidity in December
Glendora, CA

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

Months with the highest relative humidity are March and May (55%).
Months with the lowest relative humidity are August and November (45%).

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Average rainfall in December
Glendora, CA

Average rainfall in December - Glendora, CA
  • Average rainfall in December: 1.65"

The wettest month (with the highest rainfall) is February (1.73").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days in December
Glendora, CA

Average rainfall days in December - Glendora, CA
  • Average rainfall days in December: 4.7 days

The month with the highest number of rainy days is March (7.2 days).
The month with the least rainy days is June (1.1 days).

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Average snowfall days in December
Glendora, CA

Average snowfall days in December - Glendora, 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
Glendora, CA

Average daylight in December / Average sunshine in December - Glendora, 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: 7h

Months with the most sunshine are June and July (Average sunshine: 12.1h).
The month with the least sunshine is February (Average sunshine: 6.9h).

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Average sunshine days in December
Glendora, CA

Average sunshine days in December - Glendora, CA
  • Average sunshine days in December: 25.2 days

The month with the most sunshine days is June (28.6 days).
The month with the least sunshine days is February (22.6 days).

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Average UV index in December
Glendora, CA

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

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

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Average cloud cover in December
Glendora, CA

Average cloud cover in December - Glendora, 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 4).

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Average visibility in December
Glendora, CA

Average visibility in December - Glendora, 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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