Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
December is the month when Jefferson sees the lowest average temperatures, with 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 in Jefferson, Oregon, are February and December, with an average relative humidity of 87%.Rainfall
The month with the most rainfall is December, when the rain falls for 18.5 days and typically aggregates up to 3.98" (101mm) of precipitation.Snowfall
January through March, November and December are months with snowfall in Jefferson. In Jefferson, in December, snow falls for 0.5 days, with typically accumulated 0.31" (8mm) of snow. Throughout the year, there are 4.3 snowfall days, and 2.64" (67mm) of snow is accumulated.Daylight
The month with the shortest days in Jefferson is December, with an average of 8h and 54min of daylight.On the first day of December, sunrise is at 7:29 am and sunset at 4:32 pm. On the last day of the month, sunrise is at 7:49 am and sunset at 4:41 pm PST.
Sunshine
In December, the average sunshine is 4.3h.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 health risk from unsafe exposure to UV radiation for ordinary individuals.Note: A maximum UV index of 2 in December translates into the following recommendations:
Babies, children, and individuals with sensitive skin should always have protection against extended sun exposure. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Be attentive! The reflective property of snow can nearly double the Sun's UV radiation.
Frequently asked questions
What are the coldest months in Jefferson?
What is the usual temperature for Jefferson in December?
What are the most humid months in Jefferson?
What is the average humidity in December in Jefferson?
What is the rainiest month in Jefferson?
How many days does it rain in December in Jefferson?
How much does it snow in Jefferson in December?
What is the month with the shortest days in Jefferson?
What is the average length of the day in December in Jefferson?
What time are sunrise and sunset in December in Jefferson?
How many hours of sunshine does Jefferson have in December?
What is the month with the lowest UV index in Jefferson?
What is the UV index reading in December in Jefferson?
Average temperature in December
Jefferson, OR
- Average high temperature in December: 45.5°F
The warmest month (with the highest average high temperature) is August (81.9°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 (52.9°F).
The coldest month (with the lowest average low temperature) is December (34.5°F).
Average pressure in December
Jefferson, 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
Jefferson, OR
- Average wind speed in December: 4.9mph
The windiest month (with the highest average wind speed) is March (5.1mph).
The calmest month (with the lowest average wind speed) is August (4mph).
Average humidity in December
Jefferson, OR
- Average humidity in December: 87%
The months with the highest relative humidity are February and December (87%).
The month with the lowest relative humidity is August (66%).
Average rainfall in December
Jefferson, OR
- Average rainfall in December: 3.98"
The wettest month (with the highest rainfall) is December (3.98").
The driest month (with the least rainfall) is July (0.24").
Average rainfall days in December
Jefferson, OR
- Average rainfall days in December: 18.5 days
The month with the highest number of rainy days is March (20 days).
The month with the least rainy days is August (3.9 days).
Average snowfall in December
Jefferson, OR
- Average snowfall in December: 0.31"
The month with the highest snowfall is February (1.3").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Jefferson, OR
- Average snowfall days in December: 0.5 days
The month with the highest number of snowfall days is February (1.9 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
Jefferson, OR
- Average daylight in December: 8h and 5min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in December: 4h and 2min
The month with the most sunshine is August (Average sunshine: 11h and 6min).
The month with the least sunshine is February (Average sunshine: 4h and 6min).
Average sunshine days in December
Jefferson, OR
- Average sunshine days in December: 10.7 days
The month with the most sunshine days is July (25.7 days).
The month with the least sunshine days is February (9 days).
Average UV index in December
Jefferson, 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
Jefferson, OR
- Average cloud cover in December: 57
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
Jefferson, OR
- Average visibility in December: 5mi
The months with the highest visibility are July, August and September (6mi).
The month with the lowest visibility is February (4mi).
Jefferson, Oregon, USA
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