Contents
- Weather in January
- Frequently asked questions
- Average temperature in January
- Average pressure in January
- Average wind speed in January
- Average humidity in January
- Average rainfall in January
- Average rainfall days in January
- Average snowfall in January
- Average snowfall days in January
- Average daylight in January
- Average sunshine in January
- Average sunshine days in January
- Average UV index in January
- Average cloud cover in January
- Average visibility in January
Weather in January
Temperature
Jefferson notes an average high-temperature of a still frosty 47.8°F (8.8°C) in January, displaying minor variation from December. Jefferson reports a consistent average low-temperature of 35.2°F (1.8°C) throughout January nights.Humidity
In Jefferson, the average relative humidity in January is 86%.Rainfall
In Jefferson, in January, during 17.7 rainfall days, 3.86" (98mm) of precipitation is typically accumulated. Throughout the year, in Jefferson, there are 164.2 rainfall days, and 26.97" (685mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through March, November and December. In Jefferson, during January, snow falls for 0.8 days and regularly aggregates up to 0.43" (11mm) of snow. In Jefferson, during the entire year, snow falls for 4.3 days and aggregates up to 2.64" (67mm) of snow.Daylight
The average length of the day in January is 9h and 16min.On the first day of January, sunrise is at 7:49 am and sunset at 4:41 pm. On the last day of the month, sunrise is at 7:32 am and sunset at 5:18 pm PST.
Sunshine
The average sunshine in January 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 reading of 2, and below, represents a minimal health hazard from exposure to the Sun's UV radiation for average individuals.Note: In January, an average UV index of 2 transforms into the following instructions:
Many can withstand an hour in the sun without burning, yet children must always have protection against sunlight. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are January temperatures?
What is the average humidity in January?
How many days does it rain in January?
How many days does it snow in January?
How many hours of daylight does Jefferson have in January?
When is the sunrise / sunset in January?
How many hours of sunshine does Jefferson have in January?
When is the lowest UV index?
What is the UV index intensity in January?
Average temperature in January
Jefferson, OR
- Average high temperature in January: 47.8°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 January: 35.2°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 January
Jefferson, OR
- Average pressure in January: 30.11"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 January
Jefferson, OR
- Average wind speed in January: 5mph
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 January
Jefferson, OR
- Average humidity in January: 86%
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 January
Jefferson, OR
- Average rainfall in January: 3.86"
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 January
Jefferson, OR
- Average rainfall days in January: 17.7 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 January
Jefferson, OR
- Average snowfall in January: 0.43"
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 January
Jefferson, OR
- Average snowfall days in January: 0.8 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 January /
Average sunshine in January
Jefferson, OR
- Average daylight in January: 9h and 2min
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 January: 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 January
Jefferson, OR
- Average sunshine days in January: 11.8 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 January
Jefferson, OR
- Average UV index in January: 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 January
Jefferson, OR
- Average cloud cover in January: 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 January
Jefferson, OR
- Average visibility in January: 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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