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
January's onset brings an average high-temperature of a still subzero cold 28.4°F (-2°C), showing a minute difference from December's 27.3°F (-2.6°C). During the nights in January, an average low-temperature of 16.3°F (-8.7°C) is observed in Porthill.Humidity
January is the most humid month, with an average relative humidity of 94%.Rainfall
In Porthill, in January, during 13.2 rainfall days, 2.72" (69mm) of precipitation is typically accumulated. In Porthill, during the entire year, the rain falls for 157.1 days and collects up to 21.61" (549mm) of precipitation.Snowfall
January through April, September through December are months with snowfall. January is the month with the most snowfall in Porthill. Snow falls for 14.2 days and accumulates 11.02" (280mm) of snow.Daylight
In January, the average length of the day is 8h and 47min.On the first day of January in Porthill, Idaho, sunrise is at 8:39 am and sunset at 4:59 pm. On the last day of the month, sunrise is at 8:17 am and sunset at 5:40 pm MST.
Sunshine
January has the least sunshine of the year, with an average of 3.8h of sunshine.UV index
January, February, November and December, with an average maximum UV index of 1, are months with the lowest UV index in Porthill. A UV Index of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV rays for the average person.Note: A daily maximum UV index of 1 in January translates into the following instructions:
Prolonged sun exposure should always be prevented in babies, children, and those with sensitive skin. 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. Take heed! Reflection from the snow can almost amplify the Sun's UV radiation by double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is January in Porthill?
What is the most humid month in Porthill?
What is the average humidity in January in Porthill?
How many days does it rain in January in Porthill?
When does it snow the most in Porthill?
How many days does it snow in January in Porthill?
How many hours of daylight does Porthill have in January?
When is the sunrise / sunset in January in Porthill?
What is the month with the least sunshine in Porthill?
How many hours of sunshine does Porthill have in January?
What is the month with the lowest UV index in Porthill?
How high is the UV index in January in Porthill?
Average temperature in January
Porthill, ID
- Average high temperature in January: 28.4°F
The warmest month (with the highest average high temperature) is August (76.3°F).
The month with the lowest average high temperature is December (27.3°F).
- Average low temperature in January: 16.3°F
The month with the highest average low temperature is August (47.7°F).
The coldest months (with the lowest average low temperature) are January and December (16.3°F).
Average pressure in January
Porthill, ID
- Average pressure in January: 30.19"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in January
Porthill, ID
- Average wind speed in January: 3.6mph
The windiest month (with the highest average wind speed) is June (4.3mph).
The calmest month (with the lowest average wind speed) is December (3.5mph).
Average humidity in January
Porthill, ID
- Average humidity in January: 94%
The month with the highest relative humidity is January (94%).
The month with the lowest relative humidity is August (55%).
Average rainfall in January
Porthill, ID
- Average rainfall in January: 2.72"
The wettest month (with the highest rainfall) is December (2.76").
The driest month (with the least rainfall) is August (0.43").
Average rainfall days in January
Porthill, ID
- Average rainfall days in January: 13.2 days
The month with the highest number of rainy days is April (19.7 days).
The month with the least rainy days is August (6.5 days).
Average snowfall in January
Porthill, ID
- Average snowfall in January: 11.02"
The month with the highest snowfall is January (11.02").
The months with the least snowfall are May, June, July and August (0").
Average snowfall days in January
Porthill, ID
- Average snowfall days in January: 14.2 days
The month with the highest number of snowfall days is December (17.4 days).
The months with the least snowfall days are May, June, July and August (0 days).
Average daylight in January /
Average sunshine in January
Porthill, ID
- Average daylight in January: 8h and 5min
The month with the longest days is June (Average daylight: 16h and 6min).
The month with the shortest days is December (Average daylight: 8h and 18min).
- Average sunshine in January: 3h and 5min
The month with the most sunshine is August (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days in January
Porthill, ID
- Average sunshine days in January: 11.5 days
The month with the most sunshine days is August (21.8 days).
The month with the least sunshine days is March (7.7 days).
Average UV index in January
Porthill, ID
- Average UV index in January: 1
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 1).
Average cloud cover in January
Porthill, ID
- Average cloud cover in January: 62
The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is August (Cloud cover 15).
Average visibility in January
Porthill, ID
- Average visibility in January: 2mi
The months with the highest visibility are May, June, July, August and September (6mi).
The month with the lowest visibility is January (2mi).
Porthill, Idaho, USA
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