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
A minor adjustment in Mountain Brook's average high-temperature is noted with the start of January, touching a still icy 36.7°F (2.6°C) from December's 35.2°F (1.8°C). Mountain Brook experiences an average low-temperature of 26.8°F (-2.9°C) in month of January.Humidity
January, February and December, with an average relative humidity of 88%, are the most humid months in Mountain Brook, Washington.Rainfall
The month with the most rainfall is January, when the rain falls for 17.1 days and typically aggregates up to 4.88" (124mm) of precipitation.Snowfall
January through April, November and December are months with snowfall in Mountain Brook. January is the month with the most snowfall in Mountain Brook, Washington. Snow falls for 5.3 days and accumulates 6.22" (158mm) of snow.Daylight
In January, the average length of the day is 9h and 10min.On the first day of January, sunrise is at 7:46 am and sunset at 4:31 pm. On the last day of the month, sunrise is at 7:28 am and sunset at 5:09 pm PST.
Sunshine
January has the least sunshine of the year in Mountain Brook, with an average of 3.9h of sunshine.UV index
January and February, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index reading of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The maximum daily UV index of 1 during January translates into the following directions:
Unlike children, who always need sun protection, most individuals can remain in the sun for up to an hour without getting burnt. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Mind you! Snow reflection can increase the intensity of the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in Mountain Brook in January?
What is the most humid month in Mountain Brook?
What is the average humidity in January in Mountain Brook?
What is the wettest month in Mountain Brook?
How many days does it rain in January in Mountain Brook?
What is the snowiest month in Mountain Brook?
How many days does it snow in January in Mountain Brook?
What is the average length of the day in January in Mountain Brook?
What time are sunrise and sunset in January in Mountain Brook?
What is the month with the least sunshine in Mountain Brook?
How many hours of sunshine does Mountain Brook have in January?
What is the month with the lowest UV index in Mountain Brook?
What is the UV index reading in January in Mountain Brook?
Average temperature in January
Mountain Brook, WA
- Average high temperature in January: 36.7°F
The warmest month (with the highest average high temperature) is August (78.6°F).
The month with the lowest average high temperature is December (35.2°F).
- Average low temperature in January: 26.8°F
The month with the highest average low temperature is August (52.3°F).
The coldest month (with the lowest average low temperature) is December (26.1°F).
Average pressure in January
Mountain Brook, WA
- Average pressure in January: 30.15"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is August (29.97"Hg).
Average wind speed in January
Mountain Brook, WA
- Average wind speed in January: 5mph
The windiest month (with the highest average wind speed) is June (6.4mph).
The calmest month (with the lowest average wind speed) is October (4.8mph).
Average humidity in January
Mountain Brook, WA
- Average humidity in January: 88%
The months with the highest relative humidity are January, February and December (88%).
The months with the lowest relative humidity are July and August (58%).
Average rainfall in January
Mountain Brook, WA
- Average rainfall in January: 4.88"
The wettest month (with the highest rainfall) is January (4.88").
The driest month (with the least rainfall) is July (0.24").
Average rainfall days in January
Mountain Brook, WA
- Average rainfall days in January: 17.1 days
The month with the highest number of rainy days is March (19.4 days).
The month with the least rainy days is August (3.8 days).
Average snowfall in January
Mountain Brook, WA
- Average snowfall in January: 6.22"
The month with the highest snowfall is January (6.22").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in January
Mountain Brook, WA
- Average snowfall days in January: 5.3 days
The month with the highest number of snowfall days is December (6.5 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
Mountain Brook, 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 5min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in January
Mountain Brook, WA
- Average sunshine days in January: 10.3 days
The month with the most sunshine days is July (25.8 days).
The month with the least sunshine days is February (8.8 days).
Average UV index in January
Mountain Brook, WA
- Average UV index in January: 1
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January and February (UV index 1).
Average cloud cover in January
Mountain Brook, WA
- Average cloud cover in January: 61
The months with the most cloud cover are January and February (Cloud cover 61).
The months with the least cloud cover are July and August (Cloud cover 15).
Average visibility in January
Mountain Brook, WA
- Average visibility in January: 4mi
The months with the highest visibility are May, June, July, August and September (6mi).
The months with the lowest visibility are January, February and December (4mi).
Mountain Brook, Washington, USA
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