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
January's presence marks an average high-temperature of a still wintry 38.3°F (3.5°C), subtly varied from December's 36.5°F (2.5°C). During the month of January, the temperature falls to an average of 27.7°F (-2.4°C).Humidity
With an average relative humidity of 81%, January is the most humid month.Rainfall
In January, the rain falls for 15.3 days. Throughout January, 1.89" (48mm) of precipitation is accumulated. Throughout the year, in Dayton, there are 144.3 rainfall days, and 15.75" (400mm) of precipitation is accumulated.Snowfall
January through May, September, November and December are months with snowfall. In January, it is snowing for 6.2 days. Throughout January, 3.23" (82mm) of snow is accumulated. Throughout the year, there are 28.4 snowfall days, and 13.58" (345mm) of snow is accumulated.Daylight
In January, the average length of the day is 9h and 6min.On the first day of January, sunrise is at 7:34 am and sunset at 4:15 pm. On the last day of the month, sunrise is at 7:16 am and sunset at 4:54 pm PST.
Sunshine
January has the least sunshine of the year, with an average of 5.1h of sunshine.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 reading of 2, and below, represents a low health risk from exposure to the Sun's UV rays for the ordinary person.Note: The daily high UV index of 2 during January translates into the following recommendations:
Most people face no serious problems with extended sun exposure, but those with fair skin, infants, and children always need protection. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. Pay attention! The reflection of snow can enhance the Sun's UV radiation almost double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Is January cold?
What is the most humid month?
What is the average humidity in January?
How many days does it rain in January?
How much does it snow in January?
What is the average length of the day in January?
What time are sunrise and sunset in January?
What is the month with the least sunshine?
How long on average sun shines in January?
When is the lowest UV index?
What is the UV index intensity in January?
Average temperature in January
Dayton, WA
- Average high temperature in January: 38.3°F
The warmest month (with the highest average high temperature) is August (83.7°F).
The month with the lowest average high temperature is December (36.5°F).
- Average low temperature in January: 27.7°F
The month with the highest average low temperature is August (60.3°F).
The coldest month (with the lowest average low temperature) is December (25.7°F).
Average pressure in January
Dayton, WA
- Average pressure in January: 30.19"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is August (29.9"Hg).
Average wind speed in January
Dayton, WA
- Average wind speed in January: 7.1mph
The windiest month (with the highest average wind speed) is April (8.6mph).
The calmest month (with the lowest average wind speed) is September (6.3mph).
Average humidity in January
Dayton, WA
- Average humidity in January: 81%
The month with the highest relative humidity is January (81%).
The month with the lowest relative humidity is August (39%).
Average rainfall in January
Dayton, WA
- Average rainfall in January: 1.89"
The wettest month (with the highest rainfall) is December (2.05").
The driest months (with the least rainfall) are July and August (0.35").
Average rainfall days in January
Dayton, WA
- Average rainfall days in January: 15.3 days
The month with the highest number of rainy days is March (17.6 days).
The month with the least rainy days is July (5.3 days).
Average snowfall in January
Dayton, WA
- Average snowfall in January: 3.23"
The month with the highest snowfall is February (4.53").
The months with the least snowfall are June, July, August and October (0").
Average snowfall days in January
Dayton, WA
- Average snowfall days in January: 6.2 days
The month with the highest number of snowfall days is February (7.7 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in January /
Average sunshine in January
Dayton, WA
- Average daylight in January: 9h and 1min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in January: 5h and 1min
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: 5h and 6min).
Average sunshine days in January
Dayton, WA
- Average sunshine days in January: 12.2 days
The month with the most sunshine days is July (24 days).
The month with the least sunshine days is February (10 days).
Average UV index in January
Dayton, WA
- Average UV index in January: 2
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in January
Dayton, WA
- Average cloud cover in January: 47
The months with the most cloud cover are January and February (Cloud cover 47).
The months with the least cloud cover are July and August (Cloud cover 11).
Average visibility in January
Dayton, WA
- Average visibility in January: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Dayton, Washington, USA
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