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 January takes hold, the average high-temperature is a frosty 44.6°F (7°C), nearly mirroring that of the previous month. Napavine observes an average low-temperature of 33.8°F (1°C) during January nights.Humidity
January, February, November and December, with an average relative humidity of 89%, are the most humid months.Rainfall
The month with the most rainfall is January, when the rain falls for 18.6 days and typically aggregates up to 5.51" (140mm) of precipitation.Snowfall
January through March, November and December are months with snowfall. In Napavine, in January, snow falls for 1.8 days, with typically accumulated 1.85" (47mm) of snow. Throughout the year, there are 9 snowfall days, and 5.59" (142mm) of snow is accumulated.Daylight
The average length of the day in January in Napavine is 9h and 4min.On the first day of January, sunrise is at 7:55 am and sunset at 4:34 pm. On the last day of the month, sunrise is at 7:36 am and sunset at 5:13 pm PST.
Sunshine
The average sunshine in January is 3.6h.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 unprotected exposure to Sun's UV rays for average individuals.Note: The daily high UV index of 2 during January translates into the following recommendations:
Children, babies, and those with sensitive skin should always be shielded from long periods of sun exposure. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck. Forewarned is forearmed! The Sun's UV radiation can be almost doubled in intensity by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in January?
What is the most humid month?
What is the average humidity in January?
What is the rainiest month?
How many days does it rain in January in Napavine?
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?
How many hours of sunshine does Napavine have in January?
When is the lowest UV index?
What is the UV index intensity in January?
Average temperature in January
Napavine, WA
- Average high temperature in January: 44.6°F
The warmest month (with the highest average high temperature) is August (77.5°F).
The month with the lowest average high temperature is December (42.6°F).
- Average low temperature in January: 33.8°F
The month with the highest average low temperature is August (50°F).
The coldest month (with the lowest average low temperature) is December (33.1°F).
Average pressure in January
Napavine, 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 (30.02"Hg).
Average wind speed in January
Napavine, WA
- Average wind speed in January: 4.5mph
The windiest months (with the highest average wind speed) are January, March and November (4.5mph).
The calmest month (with the lowest average wind speed) is September (3.6mph).
Average humidity in January
Napavine, WA
- Average humidity in January: 89%
The months with the highest relative humidity are January, February, November and December (89%).
The month with the lowest relative humidity is July (73%).
Average rainfall in January
Napavine, WA
- Average rainfall in January: 5.51"
The wettest month (with the highest rainfall) is January (5.51").
The driest month (with the least rainfall) is July (0.47").
Average rainfall days in January
Napavine, WA
- Average rainfall days in January: 18.6 days
The month with the highest number of rainy days is March (21.5 days).
The month with the least rainy days is August (6.4 days).
Average snowfall in January
Napavine, WA
- Average snowfall in January: 1.85"
The month with the highest snowfall is February (1.93").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in January
Napavine, WA
- Average snowfall days in January: 1.8 days
The month with the highest number of snowfall days is February (3.5 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
Napavine, WA
- Average daylight in January: 9h and 1min
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: 3h and 4min
The month with the most sunshine is August (Average sunshine: 10h and 12min).
The month with the least sunshine is December (Average sunshine: 3h and 30min).
Average sunshine days in January
Napavine, WA
- Average sunshine days in January: 9.6 days
The months with the most sunshine days are July and August (20.8 days).
The month with the least sunshine days is February (7.6 days).
Average UV index in January
Napavine, WA
- Average UV index in January: 2
The month with the highest UV index is 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
Napavine, WA
- Average cloud cover in January: 65
The months with the most cloud cover are January, February and December (Cloud cover 65).
The month with the least cloud cover is August (Cloud cover 38).
Average visibility in January
Napavine, 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).
Napavine, Washington, USA
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