January weather forecastRiverside, WA
January
Weather in January
January, like December, is a freezing cold winter month in Riverside, Washington, with an average temperature fluctuating between 30.9°F (-0.6°C) and 18.7°F (-7.4°C).Temperature
The arrival of January records an average high-temperature of a still subzero cold 30.9°F (-0.6°C), closely related to the 30.4°F (-0.9°C) observed in December. Riverside's average low-temperature in January is measured at a still freezing cold 18.7°F (-7.4°C).Humidity
With an average relative humidity of 91%, January is the most humid month in Riverside.Rainfall
In Riverside, in January, during 9.4 rainfall days, 0.91" (23mm) of precipitation is typically accumulated. Throughout the year, there are 90.2 rainfall days, and 7.56" (192mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through April, November and December. January is the month with the most snowfall in Riverside. Snow falls for 6.2 days and accumulates 3.39" (86mm) of snow.Daylight
The average length of the day in January is 8h and 51min.On the first day of January, sunrise is at 7:49 am and sunset at 4:13 pm. On the last day of the month, sunrise is at 7:28 am and sunset at 4:54 pm PST.
Sunshine
January has the least sunshine of the year, with an average of 4.5h of sunshine.UV index
In Riverside, the average daily maximum UV index in January is 2. A UV Index reading of 2, and below, represents a minimal health hazard from exposure to the Sun's UV rays for the ordinary person.Note: The maximum daily UV index of 2 in January converts into the following recommendations:
Despite most people tolerating extended sun exposure, it is critical to always protect those with sensitive skin, infants, and children. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades. Be mindful! The reflection from snow can increase the Sun's UV radiation nearly twice.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in January
Riverside, WA
- Average high temperature in January: 30.9°F
The warmest month (with the highest average high temperature) is July (82.6°F).
The month with the lowest average high temperature is December (30.4°F).
- Average low temperature in January: 18.7°F
The month with the highest average low temperature is August (55°F).
The coldest month (with the lowest average low temperature) is December (18.1°F).
Average pressure in January
Riverside, WA
- Average pressure in January: 30.17"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The months with the lowest atmospheric pressure are June and August (29.93"Hg).
Average wind speed in January
Riverside, WA
- Average wind speed in January: 4mph
The windiest month (with the highest average wind speed) is April (5.1mph).
The calmest month (with the lowest average wind speed) is January (4mph).
Average humidity in January
Riverside, WA
- Average humidity in January: 91%
The month with the highest relative humidity is January (91%).
The months with the lowest relative humidity are July and August (42%).
Average rainfall in January
Riverside, WA
- Average rainfall in January: 0.91"
The wettest month (with the highest rainfall) is December (0.94").
The driest months (with the least rainfall) are July and August (0.2").
Average rainfall days in January
Riverside, WA
- Average rainfall days in January: 9.4 days
The month with the highest number of rainy days is March (11.5 days).
The month with the least rainy days is August (2.8 days).
Average snowfall in January
Riverside, WA
- Average snowfall in January: 3.39"
The month with the highest snowfall is January (3.39").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in January
Riverside, WA
- Average snowfall days in January: 6.2 days
The month with the highest number of snowfall days is December (8.4 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in January /
Average sunshine in January
Riverside, WA
- Average daylight in January: 8h and 54min
The month with the longest days is June (Average daylight: 16h and 6min).
The month with the shortest days is December (Average daylight: 8h and 24min).
- Average sunshine in January: 4h and 30min
The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).
Average sunshine days in January
Riverside, WA
- Average sunshine days in January: 17.2 days
The month with the most sunshine days is August (26.3 days).
The month with the least sunshine days is November (15.4 days).
Average UV index in January
Riverside, WA
- Average UV index in January: 2
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is November (UV index 1).
Average cloud cover in January
Riverside, WA
- 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 12).
Average visibility in January
Riverside, WA
- Average visibility in January: 4mi
The months with the highest visibility are April, May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February and December (4mi).
