December weather forecast
Glendora, CA

Share
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 refreshing month in Glendora, California, with an average temperature varying between 45.5°F (7.5°C) and 61.5°F (16.4°C).

Temperature

Glendora, California, experiences its lowest temperatures in December, with an average peak of 61.5°F (16.4°C) and a low of 45.5°F (7.5°C).

Humidity

In December, the average relative humidity is 51%.

Rainfall

In December, 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

December has the shortest days of the year, with an average of 9h and 54min of daylight.
On the first day of the month, sunrise is at 6:39 am and sunset at 4:41 pm. On the last day of December, sunrise is at 6:57 am and sunset at 4:52 pm PST.

Sunshine

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

UV index

The month with the lowest UV index is December, with an average maximum UV index of 3. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In December, a regular UV index of 3 translates into these guidelines:
Take precautions. Light skin individuals may get burned in less than 30 minutes. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. Boost your sun resistance with garments that are densely woven yet spacious.
[Resources]

Frequently asked questions

What is the coldest month in Glendora?

Temperature readings reach their annual highs in December, averaging 61.5°F (16.4°C) and a minimum average of 45.5°F (7.5°C).

What is the usual temperature for Glendora in December?

In December, in Glendora, the average high-temperature is 61.5°F (16.4°C), and the average low-temperature is 45.5°F (7.5°C). In September, the average heat index (a.k.a. 'real feel', 'apparent temperature'), which represents the influence of relative humidity on air temperature, is computed to be 87.8°F (31°C).

What is the average humidity in December in Glendora?

In Glendora, the average relative humidity in December 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.

What is the month with the shortest days in Glendora?

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

How many hours of daylight does Glendora have in December?

In December, the average day length in Glendora is 9h and 55min.

When is the sunrise / sunset in December in Glendora?

On the first day of December in Glendora, sunrise is at 6:39 am and sunset at 4:41 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 4:52 pm PST.

How long on average sun shines in December in Glendora?

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

When is 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.

How high is the UV index in December in Glendora?

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

[Resources]

Average pressure in December
Glendora, CA

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

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

[Resources]

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).

[Resources]

Average humidity in December
Glendora, CA

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

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

[Resources]

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").

[Resources]

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).

[Resources]

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).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October, November and December (0 days).

[Resources]

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

Average daylight in December / Average sunshine in December - Glendora, 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: 7h and 0min

The months with the most sunshine are June and July (Average sunshine: 12h and 6min).
The month with the least sunshine is February (Average sunshine: 6h and 54min).

[Resources]

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).

[Resources]

Average UV index in December
Glendora, CA

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

The 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).

[Resources]

Average cloud cover in December
Glendora, CA

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

The 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).

[Resources]

Average visibility in December
Glendora, CA

Average visibility in December - Glendora, 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).

[Resources]

Glendora, California, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location