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
With the transition into January, Sumner notes an average high-temperature of a frosty 43.3°F (6.3°C), closely resembling December. Nighttime temperature lowers to an average of 33.1°F (0.6°C) in January.Humidity
January is the most humid month in Sumner, with an average relative humidity of 87%.Rainfall
In January, in Sumner, the rain falls for 18.6 days. Throughout January, 5.2" (132mm) of precipitation is accumulated. Throughout the year, in Sumner, there are 185 rainfall days, and 35.71" (907mm) of precipitation is accumulated.Snowfall
Months with snowfall in Sumner are January through April, November and December. In Sumner, Washington, in January, snow falls for 2.8 days, with typically accumulated 2.17" (55mm) of snow. In Sumner, during the entire year, snow falls for 15.8 days and aggregates up to 9.09" (231mm) of snow.Daylight
The average length of the day in January in Sumner is 9h and 0min.On the first day of January in Sumner, 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 in Sumner. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV rays for the ordinary person.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. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Mind you! Snow reflection can increase the intensity of the Sun's UV radiation nearly twofold.
Frequently asked questions
Is it cold in Sumner during January?
What is the most humid month in Sumner?
What is the average humidity in January in Sumner?
How many days does it rain in January in Sumner?
How many days does it snow in January in Sumner?
What is the average length of the day in January in Sumner?
When are sunrise and sunset in January in Sumner?
How many hours of sunshine does Sumner have in January?
When is the lowest UV index in Sumner?
What is the UV index reading in January in Sumner?
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 2min
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).
Sumner, Washington, USA
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