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
Index's transition from December to January introduces an average high-temperature of a still icy 39.9°F (4.4°C), marking an insignificant variation from the 38.3°F (3.5°C). An average low-temperature of 29.7°F (-1.3°C) is observed during January nights in Index.Humidity
The months with the highest humidity are January through March, with an average relative humidity of 88%.Rainfall
January is the month with the most rainfall. Rain falls for 19.5 days and accumulates 7.8" (198mm) of precipitation.Snowfall
January through April, November and December are months with snowfall in Index, Washington. In January, it is snowing for 2.4 days. Throughout January, 3.94" (100mm) of snow is accumulated. In Index, during the entire year, snow falls for 15.9 days and aggregates up to 14.41" (366mm) of snow.Daylight
In January, the average length of the day in Index is 8h and 56min.On the first day of January in Index, Washington, sunrise is at 7:55 am and sunset at 4:24 pm. On the last day of the month, sunrise is at 7:34 am and sunset at 5:04 pm PST.
Sunshine
The months with the least sunshine in Index, Washington, are January and December, with an average of 3.7h of sunshine.UV index
The months with the lowest UV index are January through April, October through December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents 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:
Those with sensitive skin, infants, and children require constant safeguarding from prolonged sun exposure. To avoid the Sun's strongest rays, limit exposure around the mid-day period. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. Guard yourself! Snow reflection can almost double the UV radiation from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Is it cold in Index during January?
What is the most humid month in Index?
What is the average humidity in January in Index?
What is the wettest month in Index?
How much does it rain in Index in January?
How many days does it snow in January in Index?
What is the average length of the day in January in Index?
When is the sunrise / sunset in January in Index?
What are the months with the least sunshine in Index?
How many hours of sunshine does Index have in January?
What are the months with the lowest UV index in Index?
What is the UV index intensity in January in Index?
Average temperature in January
Index, WA
- Average high temperature in January: 39.9°F
The warmest month (with the highest average high temperature) is August (73.4°F).
The month with the lowest average high temperature is December (38.3°F).
- Average low temperature in January: 29.7°F
The month with the highest average low temperature is August (48°F).
The coldest month (with the lowest average low temperature) is December (28.6°F).
Average pressure in January
Index, WA
- Average pressure in January: 30.11"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is August (29.99"Hg).
Average wind speed in January
Index, WA
- Average wind speed in January: 4.8mph
The windiest month (with the highest average wind speed) is January (4.8mph).
The calmest month (with the lowest average wind speed) is August (3.2mph).
Average humidity in January
Index, WA
- Average humidity in January: 88%
The months with the highest relative humidity are January, February and March (88%).
The month with the lowest relative humidity is July (72%).
Average rainfall in January
Index, WA
- Average rainfall in January: 7.8"
The wettest month (with the highest rainfall) is January (7.8").
The driest month (with the least rainfall) is August (0.79").
Average rainfall days in January
Index, WA
- Average rainfall days in January: 19.5 days
The month with the highest number of rainy days is March (22.3 days).
The month with the least rainy days is August (7.9 days).
Average snowfall in January
Index, WA
- Average snowfall in January: 3.94"
The month with the highest snowfall is February (5.43").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in January
Index, WA
- Average snowfall days in January: 2.4 days
The month with the highest number of snowfall days is February (5.2 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
Index, WA
- Average daylight in January: 8h and 5min
The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in January: 3h and 4min
The month with the most sunshine is August (Average sunshine: 10h and 24min).
The months with the least sunshine are January and December (Average sunshine: 3h and 42min).
Average sunshine days in January
Index, WA
- Average sunshine days in January: 9.7 days
The month with the most sunshine days is August (19.9 days).
The month with the least sunshine days is March (7 days).
Average UV index in January
Index, 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, March, April, October, November and December (UV index 2).
Average cloud cover in January
Index, WA
- Average cloud cover in January: 60
The months with the most cloud cover are March and December (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility in January
Index, WA
- Average visibility in January: 4mi
The months with the highest visibility are May, June, July, August, September and October (5mi).
The months with the lowest visibility are January, February, March, April, November and December (4mi).
Index, Washington, USA
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