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 records an average high-temperature of a still cold 34.9°F (1.6°C), indicating a minor variation from the preceding month. Throughout the month of January, Riley observes an average nighttime temperature of 22.3°F (-5.4°C).Humidity
The average relative humidity in January is 81%.Rainfall
In Riley, in January, it is raining for 12.8 days, with typically 1.46" (37mm) of accumulated precipitation. In Riley, during the entire year, the rain falls for 125.1 days and collects up to 11.26" (286mm) of precipitation.Snowfall
January through March, November and December are months with snowfall. In Riley, during January, snow falls for 2 days and regularly aggregates up to 0.47" (12mm) of snow. In Riley, during the entire year, snow falls for 8.6 days and aggregates up to 1.97" (50mm) of snow.Daylight
In Riley, the average length of the day in January is 9h and 23min.On the first day of the month, sunrise is at 7:31 am and sunset at 4:31 pm. On the last day of January, sunrise is at 7:15 am and sunset at 5:07 pm PST.
Sunshine
The average sunshine in January is 5.4h.UV index
January through March, 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 minimal health vulnerability from unprotected exposure to Sun's UV rays for average individuals.Note: In January, a daily maximum UV index of 2 leads to the following instructions:
Babies, children, and individuals with sensitive skin should always have protection against extended sun exposure. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. Employ a hat with a wide brim for robust protection, cutting UV exposure by half. Stay alert! Snow's reflective properties can almost double the UV radiation from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in January?
What is the average humidity in January?
How many days does it rain in January?
How many days does it snow in January?
What is the average length of the day in January?
What time are sunrise and sunset in January?
How long on average sun shines in January in Riley?
What are the months with the lowest UV index?
What is the UV index reading in January in Riley?
Average temperature in January
Riley, OR
- Average high temperature in January: 34.9°F
The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is December (33.1°F).
- Average low temperature in January: 22.3°F
The month with the highest average low temperature is August (58.1°F).
The coldest month (with the lowest average low temperature) is December (21.2°F).
Average pressure in January
Riley, OR
- Average pressure in January: 30.22"Hg
The month with the highest atmospheric pressure is January (30.22"Hg).
The month with the lowest atmospheric pressure is August (29.94"Hg).
Average wind speed in January
Riley, OR
- Average wind speed in January: 7.7mph
The windiest month (with the highest average wind speed) is April (9.9mph).
The calmest month (with the lowest average wind speed) is August (7.5mph).
Average humidity in January
Riley, OR
- Average humidity in January: 81%
The month with the highest relative humidity is December (83%).
The months with the lowest relative humidity are July and August (33%).
Average rainfall in January
Riley, OR
- Average rainfall in January: 1.46"
The wettest month (with the highest rainfall) is December (1.54").
The driest month (with the least rainfall) is July (0.16").
Average rainfall days in January
Riley, OR
- Average rainfall days in January: 12.8 days
The month with the highest number of rainy days is March (17.7 days).
The month with the least rainy days is August (3.3 days).
Average snowfall in January
Riley, OR
- Average snowfall in January: 0.47"
The month with the highest snowfall is December (0.87").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in January
Riley, OR
- Average snowfall days in January: 2 days
The month with the highest number of snowfall days is December (3.1 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in January /
Average sunshine in January
Riley, OR
- Average daylight in January: 9h and 2min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in January: 5h and 2min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 12min).
Average sunshine days in January
Riley, OR
- Average sunshine days in January: 15.7 days
The months with the most sunshine days are July and August (25.3 days).
The month with the least sunshine days is March (11.5 days).
Average UV index in January
Riley, OR
- Average UV index in January: 2
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in January
Riley, OR
- Average cloud cover in January: 44
The month with the most cloud cover is December (Cloud cover 47).
The months with the least cloud cover are July and August (Cloud cover 9).
Average visibility in January
Riley, OR
- Average visibility in January: 5mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
Riley, Oregon, USA
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