This report describes the typical weather at the Austin-Bergstrom International Airport (Austin, Texas, United States) weather station over the course of an average May. 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 May is characterized by rising daily high temperatures, with daily highs increasing from 84°F to 91°F over the course of the month, exceeding 95°F or dropping below 77°F only one day in ten.
Over the course of May, the length of the day is gradually increasing. The shortest day of the month is May 1 with 13:22 hours of daylight; the longest day is May 31 with 13:58 hours of daylight.
The earliest sunrise is at 6:29am on May 31; the latest sunset is at 8:28pm on May 31; the latest sunrise is at 6:47am on May 1; the earliest sunset is at 8:08pm on May 1.
Daylight savings time is observed in 2012 but it neither starts nor ends in May, so the entire month is in daylight time.
The median cloud cover ranges from 70% (partly cloudy) to 78% (partly cloudy). The trend is for the sky to be clearing with the median cloud cover decreasing by 8% from the start to the end of the month.
On May 16, a representative day, the sky is clear or mostly clear 26% of the time, partly cloudy 18% of the time, and mostly cloudy or overcast 56% of the time.
The average probability that some form of precipitation will be observed in a given day is 32%, with little variation over the course of the month.
Throughout May, the most common forms of precipitation are thunderstorms, light rain, and moderate rain.
Thunderstorms are the most severe precipitation observed during 47% of those days with precipitation. They are most likely around May 31, when it is observed during 16% of all days.
Light rain is the most severe precipitation observed during 33% of those days with precipitation. It is most likely around May 14, when it is observed during 12% of all days.
Moderate rain is the most severe precipitation observed during 11% of those days with precipitation. It is most likely around May 23, when it is observed during 4% of all days.
Either snow is exceptionally unlikely to fall at this location in May or this station does not reliably report precipitation types.
The relative humidity typically ranges from 45% (comfortable) to 94% (very humid) over the course of a typical May, rarely dropping below 31% (comfortable) and reaching as high as 100% (very humid).
The air is driest around May 27, at which time the relative humidity drops below 52% (mildly humid) three days out of four; it is most humid around May 29, rising above 92% (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 May, the dew point typically varies from 57°F (comfortable) to 71°F (very muggy) and is rarely below 45°F (dry) or above 74°F (very muggy).
Over the course of May typical wind speeds vary from 1 mph to 17 mph (calm to moderate breeze), rarely exceeding 23 mph (fresh breeze).
The highest average wind speed of 10 mph (gentle breeze) occurs around May 3, at which time the average daily maximum wind speed is 17 mph (moderate breeze).
The lowest average wind speed of 9 mph (gentle breeze) occurs around May 28, at which time the average daily maximum wind speed is 16 mph (moderate breeze).