This report describes the typical weather at the Reno-Tahoe International Airport (Reno, Nevada, United States) weather station over the course of an average January. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.
Reno, Nevada has a cold semi-arid steppe climate. The area within 25 mi of this station is covered by shrublands (66%), forests (23%), grasslands (8%), and lakes and rivers (3%).
The month of January is characterized by gradually rising daily high temperatures, with daily highs increasing from 43°F to 47°F over the course of the month, exceeding 58°F or dropping below 32°F only one day in ten.
Over the course of January, the length of the day is gradually increasing. The shortest day of the month is January 1 with 9:25 hours of daylight; the longest day is January 31 with 10:10 hours of daylight.
The earliest sunrise is at 7:07am on January 31; the latest sunset is at 5:18pm on January 31; the latest sunrise is at 7:20am on January 5; the earliest sunset is at 4:45pm on January 1.
Daylight savings time is observed in 2012 but it neither starts nor ends in January, so the entire month is in standard time.
The median cloud cover is 68% (partly cloudy) and does not vary substantially over the course of the month.
On January 16, a representative day, the sky is clear or mostly clear 37% of the time, partly cloudy 14% of the time, and mostly cloudy or overcast 47% of the time.
The average probability that some form of precipitation will be observed in a given day is 37%, with little variation over the course of the month.
Throughout January, the most common forms of precipitation are light snow, light rain, moderate rain, and moderate snow.
Light snow is the most severe precipitation observed during 42% of those days with precipitation. It is most likely around January 20, when it is observed during 16% of all days.
Light rain is the most severe precipitation observed during 20% of those days with precipitation. It is most likely around January 30, when it is observed during 8% of all days.
Moderate rain is the most severe precipitation observed during 17% of those days with precipitation. It is most likely around January 27, when it is observed during 7% of all days.
Moderate snow is the most severe precipitation observed during 16% of those days with precipitation. It is most likely around January 10, when it is observed during 6% of all days.
The likelihood of snow falling is highest around January 20, occurring in 23% of days.
Accumulation at this location in January is unlikely. The chances of there being snow on the ground are highest around January 7, occurring 17% of the time.
The snow is typically at its deepest on January 31, with a median depth of 1.9"; the depth exceeds 3.3" only one year out of ten.
The relative humidity typically ranges from 39% (comfortable) to 89% (very humid) over the course of a typical January, rarely dropping below 22% (dry) and reaching as high as 100% (very humid).
The air is driest around January 31, at which time the relative humidity drops below 48% (comfortable) three days out of four; it is most humid around January 1, rising above 85% (very humid) three days out of four.
Dew point is often a better measure of how comfortable a person will find the weather than relative humidity because it more directly relates to whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid.
Over the course of a typical January, the dew point typically varies from 17°F (dry) to 28°F (dry) and is rarely below 6°F (dry) or above 37°F (dry).
Over the course of January typical wind speeds vary from 0 mph to 11 mph (calm to gentle breeze), rarely exceeding 25 mph (strong breeze).
The highest average wind speed of 5 mph (light breeze) occurs around January 30, at which time the average daily maximum wind speed is 11 mph (gentle breeze).
The lowest average wind speed of 5 mph (light breeze) occurs around January 14, at which time the average daily maximum wind speed is 9 mph (gentle breeze).