December weather forecastGlendale, OR

December

Weather in December

December, the first month of the winter in Glendale, is also a frosty month, with an average temperature varying between 45°F (7.2°C) and 31.3°F (-0.4°C).

Temperature

Glendale's coldest month, December, generally records average temperatures ranging from a high of 45°F (7.2°C) to a low of 31.3°F (-0.4°C).

Humidity

January, February and December, with an average relative humidity of 85%, are the most humid months.

Rainfall

The wettest months are January and December, with an average 2.2" (56mm) of rainfall.

Snowfall

January through April, November and December are months with snowfall. In Glendale, in December, snow falls for 4.7 days, with typically accumulated 3.35" (85mm) of snow. In Glendale, during the entire year, snow falls for 23.3 days and aggregates up to 17.17" (436mm) of snow.

Daylight

The month with the shortest days is December, with an average of 9h and 6min of daylight.
On the first day of the month, sunrise is at 7:25 am and sunset at 4:40 pm. On the last day of December, sunrise is at 7:44 am and sunset at 4:50 pm PST.

Sunshine

December has the least sunshine of the year, with an average of 4.6h of sunshine.

UV index

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV radiation for the ordinary person.
Note: A maximum UV index of 2 in December translates into the following recommendations:
Although prolonged sun exposure does not typically bother most people, children, babies, and those with sensitive skin should always have protection. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes. Beware! Reflection from snow can magnify the Sun's UV radiation nearly twofold.

Updated: Jun 4, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

December is the coldest month, with the temperature often reaching an average high of 45°F (7.2°C) and an average low of 31.3°F (-0.4°C).

In Glendale, in December, the average high-temperature is 45°F (7.2°C), and the average low-temperature is 31.3°F (-0.4°C). The average heat index (a.k.a. 'felt air temperature', 'real feel'), which represents the influence of relative humidity on air temperature, in August is appraised at 87.8°F (31°C).

January, February and December, with an average relative humidity of 85%, are most humid months.

The average relative humidity in December is 85%.

The wettest months are January and December, with an average 2.2" (56mm) of rainfall.

In Glendale, in December, during 11.5 rainfall days, 2.2" (56mm) of precipitation is typically accumulated.

In Glendale, in December, snow falls for 4.7 days, with typically accumulated 3.35" (85mm) of snow.

December has the shortest days of the year, with an average of 9h and 6min of daylight.

In December, the average day length is 9h and 6min.

In December, on the first day of the month, sunrise is at 7:25 am and sunset at 4:40 pm. On the last day of the month, in Glendale, sunrise is at 7:44 am and sunset at 4:50 pm PST.

December has the least sunshine of the year, with an average of 4.6h of sunshine.

In Glendale, the average sunshine duration in December is 4.6h.

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index.

In Glendale, the average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a low health threat from exposure to Sun's UV rays.

Today

Tomorrow

Long-term

Year J F M A M J J A S O N December

Nov

December

Jan

Average high temperature

52.9°F

45°F

47.7°F

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

4.1mph

4.3mph

4.5mph

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

Average daylight

Average sunshine

Average sunshine days

18.3

16.1

17.4

Average UV index

Average cloud cover

Average visibility

Average temperature in December
Glendale, OR

Average high temperature in December: 45°F

The warmest month (with the highest average high temperature) is August (83.7°F).
The month with the lowest average high temperature is December (45°F).

Average low temperature in December: 31.3°F

The month with the highest average low temperature is August (49.6°F).
The coldest month (with the lowest average low temperature) is December (31.3°F).

Average pressure in December
Glendale, OR

Average pressure in December: 30.12"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is August (29.99"Hg).

Average wind speed in December
Glendale, OR

Average wind speed in December: 4mph

The windiest month (with the highest average wind speed) is January (4.1mph).
The calmest month (with the lowest average wind speed) is September (3.2mph).

Average humidity in December
Glendale, OR

Average humidity in December: 85%

The months with the highest relative humidity are January, February and December (85%).
The month with the lowest relative humidity is August (65%).

Average rainfall in December
Glendale, OR

Average rainfall in December: 2.2"

The wettest months (with the highest rainfall) are January and December (2.2").
The driest month (with the least rainfall) is July (0.08").

Average rainfall days in December
Glendale, OR

Average rainfall days in December: 11.5 days

The month with the highest number of rainy days is March (13.1 days).
The month with the least rainy days is August (2.1 days).

Average snowfall in December
Glendale, OR

Average snowfall in December: 3.35"

The month with the highest snowfall is February (5").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December
Glendale, OR

Average snowfall days in December: 4.7 days

The month with the highest number of snowfall days is February (5.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Glendale, OR

Average daylight in December: 9h and 6min

The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).

Average sunshine in December: 4h and 36min

The months with the most sunshine are July and August (Average sunshine: 11h and 42min).
The month with the least sunshine is December (Average sunshine: 4h and 36min).

Average sunshine days in December
Glendale, OR

Average sunshine days in December: 16.1 days

The month with the most sunshine days is August (27.1 days).
The month with the least sunshine days is March (13.8 days).

Average UV index in December
Glendale, OR

Average UV index in December: 2

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in December
Glendale, OR

Average cloud cover in December: 54

The month with the most cloud cover is March (Cloud cover 56).
The month with the least cloud cover is August (Cloud cover 18).

Average visibility in December
Glendale, OR

Average visibility in December: 4mi

The months with the highest visibility are June, July, August, September and October (5mi).
The months with the lowest visibility are January, February, March, April, May, November and December (4mi).