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
As December turns into January, the average high-temperatures rest at a still chilly 45.5°F (7.5°C), showing a minor variation from the prior month. Roy witnesses a consistent average low-temperature of 34.7°F (1.5°C) throughout January.Humidity
January is the most humid month in Roy, with an average relative humidity of 88%.Rainfall
In Roy, Washington, in January, it is raining for 18 days, with typically 4.61" (117mm) of accumulated precipitation. In Roy, during the entire year, the rain falls for 174.2 days and collects up to 31.06" (789mm) of precipitation.Snowfall
January through April, November and December are months with snowfall. In Roy, during January, snow falls for 1.6 days and regularly aggregates up to 1.26" (32mm) of snow. In Roy, during the entire year, snow falls for 7.9 days and aggregates up to 4.45" (113mm) of snow.Daylight
In January, the average length of the day is 9h and 2min.On the first day of the month, sunrise is at 7:55 am and sunset at 4:31 pm. On the last day of January, in Roy, sunrise is at 7:36 am and sunset at 5:10 pm PST.
Sunshine
The average sunshine in January is 4.1h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Roy. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to UV radiation for the ordinary person.Note: A maximum high daily UV index of 2 during January translates into the following directions:
While extended sun exposure does not significantly affect most people, those with sensitive skin, children, and infants should always be protected. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. During bright days, sunglasses that offer UVA and UVB defense are recommended. Warning! The reflection from snow can nearly magnify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in January in Roy?
What is the most humid month in Roy?
What is the average humidity in January in Roy?
How many days does it rain in January in Roy?
How many days does it snow in January in Roy?
What is the average length of the day in January in Roy?
When is the sunrise / sunset in January in Roy?
How many hours of sunshine does Roy have in January?
What is the month with the lowest UV index in Roy?
What is the UV index reading in January in Roy?
Average temperature in January
Roy, WA
- Average high temperature in January: 45.5°F
The warmest month (with the highest average high temperature) is August (78.4°F).
The month with the lowest average high temperature is December (43.5°F).
- Average low temperature in January: 34.7°F
The month with the highest average low temperature is August (52.2°F).
The coldest month (with the lowest average low temperature) is February (34°F).
Average pressure in January
Roy, WA
- Average pressure in January: 30.09"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The months with the lowest atmospheric pressure are March, August and September (30.01"Hg).
Average wind speed in January
Roy, WA
- Average wind speed in January: 4.8mph
The windiest month (with the highest average wind speed) is March (5mph).
The calmest month (with the lowest average wind speed) is August (3.7mph).
Average humidity in January
Roy, WA
- Average humidity in January: 88%
The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is July (69%).
Average rainfall in January
Roy, WA
- Average rainfall in January: 4.61"
The wettest month (with the highest rainfall) is December (4.96").
The driest month (with the least rainfall) is July (0.35").
Average rainfall days in January
Roy, WA
- Average rainfall days in January: 18 days
The month with the highest number of rainy days is March (19.7 days).
The month with the least rainy days is August (5.2 days).
Average snowfall in January
Roy, WA
- Average snowfall in January: 1.26"
The month with the highest snowfall is February (1.73").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in January
Roy, WA
- Average snowfall days in January: 1.6 days
The month with the highest number of snowfall days is February (2.8 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
Roy, WA
- Average daylight in January: 9h and 0min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in January: 4h and 1min
The month with the most sunshine is August (Average sunshine: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 3h and 54min).
Average sunshine days in January
Roy, WA
- Average sunshine days in January: 10.7 days
The month with the most sunshine days is August (22.9 days).
The month with the least sunshine days is November (9.1 days).
Average UV index in January
Roy, WA
- 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
Roy, WA
- Average cloud cover in January: 59
The months with the most cloud cover are January and December (Cloud cover 59).
The months with the least cloud cover are July and August (Cloud cover 28).
Average visibility in January
Roy, 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).
Roy, Washington, USA
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