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
Castle Rock indicates an average high-temperature of a frosty 44.2°F (6.8°C) in January, showing minor variation from December's 42.4°F (5.8°C). Castle Rock throughout January, experiences an average nighttime temperature of 33.3°F (0.7°C).Humidity
In January, the average relative humidity is 88%.Rainfall
The month with the most rainfall is January, when the rain falls for 15.1 days and typically aggregates up to 2.28" (58mm) of precipitation.Snowfall
January through March, November and December are months with snowfall. In Castle Rock, in January, during 1.8 snowfall days, 0.87" (22mm) of snow is typically accumulated. Throughout the year, in Castle Rock, there are 7 snowfall days, and 2.99" (76mm) of snow is accumulated.Daylight
In January, the average length of the day in Castle Rock, Washington, is 9h and 7min.On the first day of January in Castle Rock, sunrise is at 7:54 am and sunset at 4:35 pm. On the last day of the month, sunrise is at 7:35 am and sunset at 5:14 pm PST.
Sunshine
In January, the average sunshine is 3.6h.UV index
The months with the lowest UV index in Castle Rock are January, February, November and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a low health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The average daily UV index of 2 in January transforms into the following instructions:
The majority are not significantly affected by prolonged sun exposure. Infants, children, and those with fair skin must always have protection. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Always opt for UVA and UVB-resistant sunglasses on radiant days. Alert! The snow's reflection can amplify the UV radiation of the Sun nearly twice.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold does it get in Castle Rock in January?
What is the average humidity in January in Castle Rock?
What is the rainiest month in Castle Rock?
How much does it rain in Castle Rock in January?
How many days does it snow in January in Castle Rock?
How many hours of daylight does Castle Rock have in January?
When is the sunrise / sunset in January in Castle Rock?
How many hours of sunshine does Castle Rock have in January?
When is the lowest UV index in Castle Rock?
What is the UV index reading in January in Castle Rock?
Average temperature in January
Castle Rock, WA
- Average high temperature in January: 44.2°F
The warmest month (with the highest average high temperature) is August (77.7°F).
The month with the lowest average high temperature is December (42.4°F).
- Average low temperature in January: 33.3°F
The month with the highest average low temperature is August (49.6°F).
The coldest month (with the lowest average low temperature) is December (32.5°F).
Average pressure in January
Castle Rock, WA
- Average pressure in January: 30.1"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are August and September (30.01"Hg).
Average wind speed in January
Castle Rock, WA
- Average wind speed in January: 4.8mph
The windiest month (with the highest average wind speed) is January (4.8mph).
The calmest months (with the lowest average wind speed) are August and September (3.7mph).
Average humidity in January
Castle Rock, WA
- Average humidity in January: 88%
The months with the highest relative humidity are February and November (89%).
The months with the lowest relative humidity are July and August (73%).
Average rainfall in January
Castle Rock, WA
- Average rainfall in January: 2.28"
The wettest month (with the highest rainfall) is January (2.28").
The driest month (with the least rainfall) is August (0.31").
Average rainfall days in January
Castle Rock, WA
- Average rainfall days in January: 15.1 days
The month with the highest number of rainy days is March (17.5 days).
The month with the least rainy days is July (6.1 days).
Average snowfall in January
Castle Rock, WA
- Average snowfall in January: 0.87"
The month with the highest snowfall is February (1.02").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in January
Castle Rock, WA
- Average snowfall days in January: 1.8 days
The month with the highest number of snowfall days is February (2.4 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
Castle Rock, 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: 3h and 4min
The month with the most sunshine is August (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 3h and 30min).
Average sunshine days in January
Castle Rock, WA
- Average sunshine days in January: 13.7 days
The month with the most sunshine days is August (21.9 days).
The month with the least sunshine days is April (10.5 days).
Average UV index in January
Castle Rock, WA
- Average UV index in January: 2
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in January
Castle Rock, WA
- Average cloud cover in January: 63
The month with the most cloud cover is February (Cloud cover 65).
The month with the least cloud cover is August (Cloud cover 37).
Average visibility in January
Castle Rock, WA
- Average visibility in January: 4mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (4mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (4mi).
Castle Rock, Washington, USA
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