January weather forecastGrass Valley, OR
January
Weather in January
January, like December, in Grass Valley, Oregon, is another cold winter month, with an average temperature fluctuating between 38.5°F (3.6°C) and 28°F (-2.2°C).Temperature
The weather during January records an average high-temperature of a still cold 38.5°F (3.6°C), closely mirroring the preceding month. Grass Valley's average low-temperature in January is measured at a subzero cold 28°F (-2.2°C).Humidity
With an average relative humidity of 84%, January is the most humid month in Grass Valley, Oregon.Rainfall
January is the month with the most rainfall. Rain falls for 13.3 days and accumulates 1.93" (49mm) of precipitation.Snowfall
January through March, November and December are months with snowfall. In January, it is snowing for 3.1 days. Throughout January, 1.97" (50mm) of snow is accumulated. Throughout the year, there are 12.6 snowfall days, and 7.6" (193mm) of snow is accumulated.Daylight
In January, the average length of the day is 9h and 13min.On the first day of January, sunrise is at 7:42 am and sunset at 4:30 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 5:08 pm PST.
Sunshine
With an average of 5h of sunshine, January has the least sunshine of the year.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 value of 2, and less, symbolizes a low threat to health from unsafe exposure to UV radiation for the ordinary person.Note: In January, a daily maximum UV index of 2 leads to the following instructions:
Prolonged sun exposure should always be prevented in babies, children, and those with sensitive skin. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Consider carefully! The reflective quality of snow 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
Average temperature in January
Grass Valley, OR
- Average high temperature in January: 38.5°F
The warmest month (with the highest average high temperature) is July (83.5°F).
The month with the lowest average high temperature is December (37.4°F).
- Average low temperature in January: 28°F
The month with the highest average low temperature is August (57.9°F).
The coldest month (with the lowest average low temperature) is December (27°F).
Average pressure in January
Grass Valley, OR
- Average pressure in January: 30.16"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is August (29.95"Hg).
Average wind speed in January
Grass Valley, OR
- Average wind speed in January: 5mph
The windiest month (with the highest average wind speed) is June (7.9mph).
The calmest months (with the lowest average wind speed) are January and December (5mph).
Average humidity in January
Grass Valley, OR
- Average humidity in January: 84%
The month with the highest relative humidity is January (84%).
The month with the lowest relative humidity is August (46%).
Average rainfall in January
Grass Valley, OR
- Average rainfall in January: 1.93"
The wettest month (with the highest rainfall) is January (1.93").
The driest month (with the least rainfall) is July (0.12").
Average rainfall days in January
Grass Valley, OR
- Average rainfall days in January: 13.3 days
The month with the highest number of rainy days is March (14.3 days).
The month with the least rainy days is July (2.9 days).
Average snowfall in January
Grass Valley, OR
- Average snowfall in January: 1.97"
The month with the highest snowfall is February (2.87").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in January
Grass Valley, OR
- Average snowfall days in January: 3.1 days
The months with the highest number of snowfall days are February and December (3.9 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
Grass Valley, OR
- Average daylight in January: 9h and 12min
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: 5h
The months with the most sunshine are July and August (Average sunshine: 12h).
The month with the least sunshine is January (Average sunshine: 5h).
Average sunshine days in January
Grass Valley, OR
- Average sunshine days in January: 13.6 days
The month with the most sunshine days is July (27 days).
The month with the least sunshine days is February (12.3 days).
Average UV index in January
Grass 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
Grass Valley, OR
- Average cloud cover in January: 49
The month with the most cloud cover is January (Cloud cover 49).
The months with the least cloud cover are July and August (Cloud cover 9).
Average visibility in January
Grass Valley, OR
- Average visibility in January: 5mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (5mi).
