January weather forecastSumner, WA
January
Weather in January
January in Sumner, Washington, is a frosty winter month, with an average temperature ranging between min 33.1°F (0.6°C) and max 43.3°F (6.3°C).Temperature
Sumner's average high-temperature in January is a frosty 43.3°F (6.3°C), marking an insignificant difference from the 41.4°F (5.2°C) of December. In Sumner, an average low-temperature of 33.1°F (0.6°C) is recorded during January nights.Humidity
The most humid month in Sumner is January, with an average relative humidity of 87%.Rainfall
In Sumner, in January, during 18.6 rainfall days, 5.2" (132mm) of precipitation is typically accumulated. Throughout the year, there are 185 rainfall days, and 35.71" (907mm) of precipitation is accumulated.Snowfall
January through April, November and December are months with snowfall. In January, it is snowing for 2.8 days. Throughout January, 2.17" (55mm) of snow is accumulated. In Sumner, during the entire year, snow falls for 15.8 days and aggregates up to 9.09" (231mm) of snow.Daylight
In Sumner, Washington, the average length of the day in January is 9h and 0min.On the first day of January, sunrise is at 7:55 am and sunset at 4:29 pm. On the last day of the month, sunrise is at 7:35 am and sunset at 5:09 pm PST.
Sunshine
The average sunshine in January is 4.3h.UV index
January, February, October through December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a low health risk from unsafe exposure to UV radiation for the average person.Note: A maximum high UV index of 2 in January translates into the following recommendations:
While sun exposure does not greatly affect most, individuals with fair skin, babies, and children always need vigilant safeguarding. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Take careful note! The UV radiation of the Sun can be nearly doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in January
Sumner, WA
- Average high temperature in January: 43.3°F
The warmest month (with the highest average high temperature) is August (75.7°F).
The month with the lowest average high temperature is December (41.4°F).
- Average low temperature in January: 33.1°F
The month with the highest average low temperature is August (50.9°F).
The coldest month (with the lowest average low temperature) is December (32°F).
Average pressure in January
Sumner, WA
- Average pressure in January: 30.1"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is August (30"Hg).
Average wind speed in January
Sumner, WA
- Average wind speed in January: 4.9mph
The windiest month (with the highest average wind speed) is January (4.9mph).
The calmest month (with the lowest average wind speed) is August (3.5mph).
Average humidity in January
Sumner, WA
- Average humidity in January: 87%
The month with the highest relative humidity is January (87%).
The months with the lowest relative humidity are July and August (70%).
Average rainfall in January
Sumner, WA
- Average rainfall in January: 5.2"
The wettest month (with the highest rainfall) is December (5.35").
The driest month (with the least rainfall) is July (0.51").
Average rainfall days in January
Sumner, WA
- Average rainfall days in January: 18.6 days
The month with the highest number of rainy days is March (20.7 days).
The month with the least rainy days is August (6.8 days).
Average snowfall in January
Sumner, WA
- Average snowfall in January: 2.17"
The month with the highest snowfall is February (3.31").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in January
Sumner, WA
- Average snowfall days in January: 2.8 days
The month with the highest number of snowfall days is February (5.3 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
Sumner, WA
- Average daylight in January: 9h and 0min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in January: 4h and 18min
The month with the most sunshine is August (Average sunshine: 10h and 54min).
The month with the least sunshine is December (Average sunshine: 4h and 12min).
Average sunshine days in January
Sumner, WA
- Average sunshine days in January: 10.3 days
The month with the most sunshine days is August (22 days).
The month with the least sunshine days is February (8.2 days).
Average UV index in January
Sumner, WA
- Average UV index in January: 2
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, October, November and December (UV index 2).
Average cloud cover in January
Sumner, WA
- Average cloud cover in January: 56
The months with the most cloud cover are January and December (Cloud cover 56).
The month with the least cloud cover is August (Cloud cover 25).
Average visibility in January
Sumner, WA
- 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 and December (4mi).
