December weather forecastSalem, OR

An evening shot of the leafy town of Salem in Oregon

December

Weather in December

Finally, December homes the celebrations of Winter in Salem with the coldest weather throughout the year. The city sees a higher level of rainfall at 3.94" (100mm), defining the mood of December. The feature of December's weather is a moderate snowfall around 0.35" (9mm), which visually aligns with the celebratory holiday season. December stands as a festive and joyous period in Salem, complementing the winter charm.

Temperature

The coldest month is December, with an average high-temperature of 45.5°F (7.5°C) and an average low-temperature of 34.5°F (1.4°C).

Humidity

January, February and December, with an average relative humidity of 86%, are the most humid months.

Rainfall

December is the month with the most rainfall. Rain falls for 18.3 days and accumulates 3.94" (100mm) of precipitation.

Snowfall

January through March, November and December are months with snowfall. In Salem, in December, during 0.6 snowfall days, 0.35" (9mm) of snow is typically accumulated. Throughout the year, there are 4.7 snowfall days, and 2.48" (63mm) of snow is accumulated.

Daylight

With an average of 8h and 48min of daylight, December has the shortest days of the year.
On the first day of December, sunrise is at 7:30 am and sunset at 4:32 pm. On the last day of the month, sunrise is at 7:50 am and sunset at 4:40 pm PST.

Sunshine

The average sunshine in December is 4.3h.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a low health risk from unsafe exposure to UV radiation for the average person.
Note: In December, the maximum UV index of 2 suggests these recommendations:
Prolonged sun exposure should always be prevented in babies, children, and those with sensitive skin. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.

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

Frequently asked questions

December is the coldest month of the year, registering average temperatures as high as 45.5°F (7.5°C) and as low as 34.5°F (1.4°C).

The high-temperature, in December, in Salem, is 45.5°F (7.5°C), while the low-temperature averages to 34.5°F (1.4°C). In August, the average heat index (a.k.a. 'real feel', 'apparent temperature'), which takes the relative humidity and factors it into the air temperature reading, is calculated to be 86°F (30°C).

January, February and December, with an average relative humidity of 86%, are most humid months.

In December, the average relative humidity is 86%.

The month with the most rainfall is December, when the rain falls for 18.3 days and typically aggregates up to 3.94" (100mm) of precipitation.

In Salem, in December, during 18.3 rainfall days, 3.94" (100mm) of precipitation is typically accumulated.

In December, it is snowing for 0.6 days. Throughout December, 0.35" (9mm) of snow is accumulated.

The month with the shortest days is December, with an average of 8h and 48min of daylight.

In Salem, the average day length in December is 8h and 51min.

On the first day of December, sunrise is at 7:30 am and sunset at 4:32 pm. On the last day of the month, sunrise is at 7:50 am and sunset at 4:40 pm PST.

In Salem, the average sunshine duration in December is 4.3h.

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

In Salem, 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

51.8°F

45.5°F

47.7°F

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

6mph

5.8mph

6mph

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

Average daylight

Average sunshine

Average sunshine days

11.3

10.6

12.4

Average UV index

Average cloud cover

Average visibility

Average temperature in December
Salem, OR

Average high temperature in December: 45.5°F

The warmest month (with the highest average high temperature) is August (82°F).
The month with the lowest average high temperature is December (45.5°F).

Average low temperature in December: 34.5°F

The month with the highest average low temperature is August (54.1°F).
The coldest month (with the lowest average low temperature) is December (34.5°F).

Average pressure in December
Salem, OR

Average pressure in December: 30.1"Hg

The month with the highest atmospheric pressure is January (30.11"Hg).
The months with the lowest atmospheric pressure are August and September (30.01"Hg).

Average wind speed in December
Salem, OR

Average wind speed in December: 5.3mph

The windiest months (with the highest average wind speed) are January, March and November (5.5mph).
The calmest month (with the lowest average wind speed) is August (4.2mph).

Average humidity in December
Salem, OR

Average humidity in December: 86%

The months with the highest relative humidity are January, February and December (86%).
The month with the lowest relative humidity is August (65%).

Average rainfall in December
Salem, OR

Average rainfall in December: 3.94"

The wettest month (with the highest rainfall) is December (3.94").
The driest month (with the least rainfall) is July (0.28").

Average rainfall days in December
Salem, OR

Average rainfall days in December: 18.3 days

The month with the highest number of rainy days is March (19.6 days).
The month with the least rainy days is July (3.9 days).

Average snowfall in December
Salem, OR

Average snowfall in December: 0.35"

The month with the highest snowfall is February (1.18").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in December
Salem, OR

Average snowfall days in December: 0.6 days

The month with the highest number of snowfall days is February (1.8 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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

Average daylight in December: 8h and 48min

The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).

Average sunshine in December: 4h and 18min

The month with the most sunshine is August (Average sunshine: 11h and 0min).
The month with the least sunshine is February (Average sunshine: 4h and 12min).

Average sunshine days in December
Salem, OR

Average sunshine days in December: 10.6 days

The month with the most sunshine days is July (26.3 days).
The month with the least sunshine days is March (8.8 days).

Average UV index in December
Salem, 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
Salem, OR

Average cloud cover in December: 56

The month with the most cloud cover is February (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 21).

Average visibility in December
Salem, OR

Average visibility in December: 5mi

The months with the highest visibility are July, August and September (6mi).
The months with the lowest visibility are January, February, March, April, May, June, October, November and December (5mi).