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
The arrival of January brings an average high-temperature of a still frosty 45.7°F (7.6°C), nearly identical to December's 43.7°F (6.5°C). Throughout January in Washington, a steady low-temperature average of 30.9°F (-0.6°C) is noted.Humidity
The average relative humidity in January in Washington is 73%.Rainfall
In Washington, in January, during 6.3 rainfall days, 5.67" (144mm) of precipitation is typically accumulated. Throughout the year, there are 72.9 rainfall days, and 36.06" (916mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through June, September through December. In Washington, during January, snow falls for 8.7 days and regularly aggregates up to 29.37" (746mm) of snow. In Washington, during the entire year, snow falls for 53.3 days and aggregates up to 151.57" (3850mm) of snow.Daylight
The average length of the day in January is 9h and 46min.On the first day of January, sunrise is at 7:23 am and sunset at 4:50 pm. On the last day of the month, sunrise is at 7:11 am and sunset at 5:21 pm PST.
Sunshine
The month with the least sunshine in Washington is January, with an average of 5.6h of sunshine.UV index
January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Washington. A UV Index reading of 2, and below, represents a low threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: In January, an average UV index of 2 transforms into the following instructions:
While sun exposure does not greatly affect most, individuals with fair skin, babies, and children always need vigilant safeguarding. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Take note! UV radiation from the Sun can double in intensity due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average January temperature in Washington?
What is the average humidity in January in Washington?
How much does it rain in Washington in January?
How many days does it snow in January in Washington?
How many hours of daylight does Washington have in January?
What time are sunrise and sunset in January in Washington?
What is the month with the least sunshine in Washington?
How many hours of sunshine does Washington have in January?
What is the month with the lowest UV index in Washington?
How high is the UV index in January in Washington?
Average temperature in January
Washington, CA
- Average high temperature in January: 45.7°F
The warmest month (with the highest average high temperature) is July (83.5°F).
The month with the lowest average high temperature is December (43.7°F).
- Average low temperature in January: 30.9°F
The month with the highest average low temperature is July (52.9°F).
The coldest month (with the lowest average low temperature) is December (29.1°F).
Average pressure in January
Washington, CA
- Average pressure in January: 30.17"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in January
Washington, CA
- Average wind speed in January: 6mph
The windiest month (with the highest average wind speed) is February (6.3mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).
Average humidity in January
Washington, CA
- Average humidity in January: 73%
The month with the highest relative humidity is March (80%).
The month with the lowest relative humidity is July (39%).
Average rainfall in January
Washington, CA
- Average rainfall in January: 5.67"
The wettest month (with the highest rainfall) is March (7.09").
The driest month (with the least rainfall) is July (0.08").
Average rainfall days in January
Washington, CA
- Average rainfall days in January: 6.3 days
The month with the highest number of rainy days is April (11 days).
The month with the least rainy days is July (1.8 days).
Average snowfall in January
Washington, CA
- Average snowfall in January: 29.37"
The month with the highest snowfall is March (37.6").
The months with the least snowfall are July and August (0").
Average snowfall days in January
Washington, CA
- Average snowfall days in January: 8.7 days
The month with the highest number of snowfall days is March (11.7 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in January /
Average sunshine in January
Washington, CA
- Average daylight in January: 9h and 5min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in January: 5h and 4min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 5h and 36min).
Average sunshine days in January
Washington, CA
- Average sunshine days in January: 18.7 days
The month with the most sunshine days is July (28 days).
The month with the least sunshine days is March (12.6 days).
Average UV index in January
Washington, CA
- Average UV index in January: 2
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in January
Washington, CA
- Average cloud cover in January: 37
The month with the most cloud cover is March (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 5).
Average visibility in January
Washington, CA
- Average visibility in January: 5mi
The months with the highest visibility are May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March and April (5mi).
Washington, California, USA
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