December weather forecastKeizer, OR
December
Weather in December
December culminates the year with classic winter weather in Keizer, Oregon. This month registers the highest rainfall at 3.94" (100mm), signaling the onset of the rainy winter season. The air is filled with a constant chill, the skies often blanketed by pale gray clouds. The winter chill thoroughly settles in, wrapping the city in a cold embrace. The streets are adorned with festive decorations, creating a picturesque scene against the bleak winter backdrop.Temperature
December is the month when Keizer experiences its coldest temperatures, averaging a high of 45.5°F (7.5°C) and a low of 34.5°F (1.4°C).Humidity
The months with the highest humidity are January, February and December, with an average relative humidity of 86%.Rainfall
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.Snowfall
Months with snowfall are January through March, November and December. In Keizer, during December, snow falls for 0.6 days and regularly aggregates up to 0.35" (9mm) of snow. In Keizer, during the entire year, snow falls for 4.7 days and aggregates up to 2.48" (63mm) of snow.Daylight
December has the shortest days of the year, with an average of 8h and 48min of daylight.On the first day of December, sunrise is at 7:30 am and sunset at 4:31 pm. On the last day of the month, sunrise is at 7:50 am and sunset at 4:40 pm PST.
Sunshine
In December, the average sunshine 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 estimate of 2, and below, represents a low health risk from exposure to the Sun's UV rays for ordinary individuals.Note: The maximum daily UV index, 2 in December, converts into the following recommendations:
Long-term sun exposure is typically not a concern for most. However, those with sensitive skin, infants, and children must always have protection. It's recommended to limit sun exposure when its radiation is at its peak during midday. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation. Alert! The snow's reflection can amplify the UV radiation of the Sun nearly twice.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Keizer, 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
Keizer, 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
Keizer, 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
Keizer, 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
Keizer, 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
Keizer, 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
Keizer, 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
Keizer, 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
Keizer, 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
Keizer, 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
Keizer, 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
Keizer, 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
Keizer, 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).
