This report describes the typical weather at the Louis Armstrong International Airport (New Orleans, Louisiana, United States) weather station over the course of an average August. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.
New Orleans, Louisiana 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 (45%), oceans and seas (26%), lakes and rivers (12%), built-up areas (5%), and forests (5%).
The month of August is characterized by essentially constant daily high temperatures, with daily highs around 90°F throughout the month, exceeding 95°F or dropping below 85°F only one day in ten.
Over the course of August, the length of the day is gradually decreasing. From the start to the end of the month, the length of the day decreases by 47 minutes, implying an average day-over-day decrease of 1.5 minutes.
The shortest day of the month is August 31 with 12:46 hours of daylight; the longest day is August 1 with 13:33 hours of daylight.
The earliest sunrise is at 6:20am on August 1; the latest sunset is at 7:54pm on August 1; the latest sunrise is at 6:38am on August 30; the earliest sunset is at 7:24pm on August 31.
Daylight savings time is observed in 2012 but it neither starts nor ends in August, so the entire month is in daylight time.
The median cloud cover ranges from 55% (partly cloudy) to 61% (partly cloudy). The trend is for the sky to be clearing with the median cloud cover decreasing by 6% from the start to the end of the month.
On August 16, a representative day, the sky is clear or mostly clear 33% of the time, partly cloudy 27% of the time, and mostly cloudy or overcast 38% of the time.
The probability that precipitation will be observed at this location varies throughout the month. Precipitation is most likely around August 1, occurring in 62% of days. Precipitation is least likely around August 31, occurring in 51% of days.
Throughout August, the most common forms of precipitation are thunderstorms, moderate rain, and light rain.
Thunderstorms are the most severe precipitation observed during 66% of those days with precipitation. They are most likely around August 1, when it is observed during 44% of all days.
Moderate rain is the most severe precipitation observed during 18% of those days with precipitation. It is most likely around August 27, when it is observed during 11% of all days.
Light rain is the most severe precipitation observed during 13% of those days with precipitation. It is most likely around August 31, when it is observed during 8% of all days.
Either snow is exceptionally unlikely to fall at this location in August or this station does not reliably report precipitation types.
The relative humidity typically ranges from 56% (mildly humid) to 94% (very humid) over the course of a typical August, rarely dropping below 43% (comfortable) and reaching as high as 100% (very humid).
The air is driest around August 19, at which time the relative humidity drops below 63% (mildly humid) three days out of four; it is most humid around August 14, rising above 90% (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 August, the dew point typically varies from 69°F (muggy) to 77°F (oppressive) and is rarely below 63°F (mildy humid) or above 79°F (oppressive).
Over the course of August typical wind speeds vary from 0 mph to 13 mph (calm to moderate breeze), rarely exceeding 18 mph (moderate breeze).
The highest average wind speed of 6 mph (light breeze) occurs around August 31, at which time the average daily maximum wind speed is 13 mph (moderate breeze).
The lowest average wind speed of 6 mph (light breeze) occurs around August 14, at which time the average daily maximum wind speed is 12 mph (gentle breeze).