This report describes the typical weather at the Austin-Bergstrom International Airport (Austin, Texas, United States) weather station over the course of an average January. It is based on the historical records from 2000 to 2012. Earlier records are either unavailable or unreliable.
Austin, Texas has a warm humid temperate climate with hot summers and no dry season. The area within 25 mi of this station is covered by croplands (43%), grasslands (40%), forests (13%), and built-up areas (2%).
The month of January is characterized by essentially constant daily high temperatures, with daily highs around 62°F throughout the month, exceeding 76°F or dropping below 48°F only one day in ten.
Over the course of January, the length of the day is essentially constant. The shortest day of the month is January 2 with 10:15 hours of daylight; the longest day is January 31 with 10:44 hours of daylight.
The earliest sunrise is at 7:22am on January 31; the latest sunset is at 6:06pm on January 31; the latest sunrise is at 7:29am on January 13; the earliest sunset is at 5:42pm 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 ranges from 70% (partly cloudy) to 76% (partly cloudy). The trend is for the sky to be becoming cloudier with the median cloud cover increasing by 6% from the start to the end of the month.
On January 16, a representative day, the sky is clear or mostly clear 37% of the time, partly cloudy 10% of the time, and mostly cloudy or overcast 53% of the time.
The average probability that some form of precipitation will be observed in a given day is 39%, with little variation over the course of the month.
Throughout January, the most common forms of precipitation are light rain, drizzle, moderate rain, and thunderstorms.
Light rain is the most severe precipitation observed during 42% of those days with precipitation. It is most likely around January 21, when it is observed during 17% of all days.
Drizzle is the most severe precipitation observed during 19% 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 28, when it is observed during 7% of all days.
Thunderstorms are the most severe precipitation observed during 10% of those days with precipitation. They are most likely around January 27, when it is observed during 4% of all days.
The likelihood of snow falling is highest around January 15, occurring in 2% of days.
Either snow rarely accumulates at this location in January or snow depth measurements are unavailable or unreliable.
The relative humidity typically ranges from 42% (comfortable) to 92% (very humid) over the course of a typical January, rarely dropping below 20% (dry) and reaching as high as 100% (very humid).
The air is driest around January 1, at which time the relative humidity drops below 53% (mildly humid) three days out of four; it is most humid around January 29, rising above 88% (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 29°F (dry) to 47°F (dry) and is rarely below 17°F (dry) or above 61°F (comfortable).
Over the course of January typical wind speeds vary from 0 mph to 16 mph (calm to moderate breeze), rarely exceeding 22 mph (fresh breeze).
The highest average wind speed of 8 mph (gentle breeze) occurs around January 31, at which time the average daily maximum wind speed is 16 mph (moderate breeze).
The lowest average wind speed of 8 mph (gentle breeze) occurs around January 4, at which time the average daily maximum wind speed is 16 mph (moderate breeze).