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
As Forest Grove welcomes January, the average high-temperature stabilizes at a still frosty 44.4°F (6.9°C), showing little deviation from December's 43°F (6.1°C). An average low-temperature of 33.6°F (0.9°C) is recorded during the nights in January.Humidity
The average relative humidity in January is 87%.Rainfall
The month with the most rainfall is January, when the rain falls for 19.3 days and typically aggregates up to 5.47" (139mm) of precipitation.Snowfall
January through March, November and December are months with snowfall. In Forest Grove, in January, during 1.5 snowfall days, 1.34" (34mm) of snow is typically accumulated. In Forest Grove, Oregon, during the entire year, snow falls for 7.1 days and aggregates up to 4.69" (119mm) of snow.Daylight
In Forest Grove, the average length of the day in January is 9h and 11min.On the first day of the month, sunrise is at 7:52 am and sunset at 4:39 pm. On the last day of January, sunrise is at 7:34 am and sunset at 5:17 pm PST.
Sunshine
January and February, with an average of 3.5h of sunshine, are months with the least sunshine.UV index
The average daily maximum UV index in January is 2. A UV Index of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV radiation for average individuals.Note: In January, a daily maximum UV index of 2 leads to the following instructions:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat. On your guard! Snow's reflection can almost double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is January in Forest Grove?
What is the average humidity in January?
What is the wettest month?
How much does it rain in January?
How much does it snow in January?
How many hours of daylight does Forest Grove have in January?
When is the sunrise / sunset in January?
What is the month with the least sunshine?
How many hours of sunshine does Forest Grove have in January?
How high is the UV index in January in Forest Grove?
Average temperature in January
Forest Grove, OR
- Average high temperature in January: 44.4°F
The warmest month (with the highest average high temperature) is August (79.3°F).
The month with the lowest average high temperature is December (43°F).
- Average low temperature in January: 33.6°F
The month with the highest average low temperature is August (53.2°F).
The coldest month (with the lowest average low temperature) is December (33.1°F).
Average pressure in January
Forest Grove, OR
- Average pressure in January: 30.1"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are August and September (30.01"Hg).
Average wind speed in January
Forest Grove, OR
- Average wind speed in January: 4.7mph
The windiest month (with the highest average wind speed) is March (4.9mph).
The calmest month (with the lowest average wind speed) is August (4mph).
Average humidity in January
Forest Grove, OR
- Average humidity in January: 87%
The months with the highest relative humidity are February and December (88%).
The month with the lowest relative humidity is August (69%).
Average rainfall in January
Forest Grove, OR
- Average rainfall in January: 5.47"
The wettest month (with the highest rainfall) is January (5.47").
The driest months (with the least rainfall) are July and August (0.47").
Average rainfall days in January
Forest Grove, OR
- Average rainfall days in January: 19.3 days
The month with the highest number of rainy days is March (21.4 days).
The month with the least rainy days is August (6.2 days).
Average snowfall in January
Forest Grove, OR
- Average snowfall in January: 1.34"
The month with the highest snowfall is February (1.54").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in January
Forest Grove, OR
- Average snowfall days in January: 1.5 days
The month with the highest number of snowfall days is February (2.9 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
Forest Grove, 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: 3h and 3min
The month with the most sunshine is August (Average sunshine: 10h and 24min).
The months with the least sunshine are January and February (Average sunshine: 3h and 30min).
Average sunshine days in January
Forest Grove, OR
- Average sunshine days in January: 10.2 days
The month with the most sunshine days is August (22 days).
The month with the least sunshine days is March (7.6 days).
Average UV index in January
Forest Grove, OR
- Average UV index in January: 2
The months with the highest UV index are June and July (UV index 5).
The month with the lowest UV index is November (UV index 1).
Average cloud cover in January
Forest Grove, OR
- Average cloud cover in January: 65
The month with the most cloud cover is February (Cloud cover 66).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in January
Forest Grove, OR
- Average visibility in January: 4mi
The months with the highest visibility are July and August (6mi).
The months with the lowest visibility are January, February, March, November and December (4mi).
Forest Grove, Oregon, USA
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