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
The arrival of January denotes a barely perceptible change in the average high-temperatures to a still chilly 46.2°F (7.9°C) from December's 44.4°F (6.9°C). During the nights in January, Happy Valley experiences a consistent average temperature of 35.2°F (1.8°C).Humidity
In January, the average relative humidity is 83%.Rainfall
In Happy Valley, during January, the rain falls for 17.9 days and regularly aggregates up to 4.25" (108mm) of precipitation. In Happy Valley, during the entire year, the rain falls for 172.2 days and collects up to 31.3" (795mm) of precipitation.Snowfall
Months with snowfall are January through March, November and December. In Happy Valley, in January, during 1.5 snowfall days, 0.94" (24mm) of snow is typically accumulated. In Happy Valley, during the entire year, snow falls for 6.5 days and aggregates up to 4.13" (105mm) of snow.Daylight
In January, the average length of the day is 9h and 12min.On the first day of January, sunrise is at 7:49 am and sunset at 4:37 pm. On the last day of the month, sunrise is at 7:32 am and sunset at 5:14 pm PST.
Sunshine
In January, the average sunshine in Happy Valley 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 of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV rays for average individuals.Note: A maximum daily UV index of 2 during January morphs into the following directions:
Infants, children, and people with sensitive skin should always have protection against lengthy periods of sun exposure. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Guard yourself! Snow reflection can almost double the UV radiation from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are January temperatures in Happy Valley?
What is the average humidity in January?
How much does it rain in January?
How much does it snow in January?
How many hours of daylight does Happy Valley have in January?
When is the sunrise / sunset in January?
How many hours of sunshine does Happy Valley have in January?
What is the month with the lowest UV index?
What is the UV index intensity in January?
Average temperature in January
Happy Valley, OR
- Average high temperature in January: 46.2°F
The warmest month (with the highest average high temperature) is August (81.7°F).
The month with the lowest average high temperature is December (44.4°F).
- Average low temperature in January: 35.2°F
The month with the highest average low temperature is August (54.5°F).
The coldest month (with the lowest average low temperature) is December (34.7°F).
Average pressure in January
Happy Valley, OR
- Average pressure in January: 30.12"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is August (30"Hg).
Average wind speed in January
Happy Valley, OR
- Average wind speed in January: 6mph
The windiest month (with the highest average wind speed) is January (6mph).
The calmest month (with the lowest average wind speed) is August (3.7mph).
Average humidity in January
Happy Valley, OR
- Average humidity in January: 83%
The month with the highest relative humidity is February (84%).
The month with the lowest relative humidity is August (63%).
Average rainfall in January
Happy Valley, OR
- Average rainfall in January: 4.25"
The wettest month (with the highest rainfall) is December (4.57").
The driest month (with the least rainfall) is July (0.31").
Average rainfall days in January
Happy Valley, OR
- Average rainfall days in January: 17.9 days
The month with the highest number of rainy days is March (20.4 days).
The month with the least rainy days is July (4.8 days).
Average snowfall in January
Happy Valley, OR
- Average snowfall in January: 0.94"
The month with the highest snowfall is March (1.46").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in January
Happy Valley, OR
- Average snowfall days in January: 1.5 days
The month with the highest number of snowfall days is February (2.3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in January /
Average sunshine in January
Happy Valley, OR
- Average daylight in January: 9h and 1min
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 January: 4h and 2min
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 January
Happy Valley, OR
- Average sunshine days in January: 11.2 days
The month with the most sunshine days is July (23.9 days).
The month with the least sunshine days is February (8.3 days).
Average UV index in January
Happy Valley, 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
Happy Valley, OR
- Average cloud cover in January: 56
The month with the most cloud cover is February (Cloud cover 57).
The month with the least cloud cover is August (Cloud cover 22).
Average visibility in January
Happy Valley, OR
- Average visibility in January: 5mi
The months with the highest visibility are July, August, September and October (6mi).
The months with the lowest visibility are January, February, March, April, May, June, November and December (5mi).
Happy Valley, Oregon, USA
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