This report describes the typical weather at the Baton Rouge Metropolitan Airport (Baton Rouge, Louisiana, United States) weather station over the course of an average year. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.
Baton Rouge, 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 forests (53%), croplands (40%), built-up areas (4%), and lakes and rivers (3%).
Over the course of a year, the temperature typically varies from 41°F to 91°F and is rarely below 28°F or above 95°F.
The warm season lasts from May 16 to September 27 with an average daily high temperature above 85°F. The hottest day of the year is August 17, with an average high of 91°F and low of 73°F.
The cold season lasts from November 30 to February 20 with an average daily high temperature below 66°F. The coldest day of the year is January 13, with an average low of 41°F and high of 60°F.
The length of the day varies significantly over the course of the year. The shortest day is December 21 with 10:11 hours of daylight; the longest day is June 20 with 14:07 hours of daylight.
The earliest sunrise is at 6:01am on June 12 and the latest sunset is at 8:11pm on June 28. The latest sunrise is at 7:21am on November 3 and the earliest sunset is at 5:03pm on November 30.
Daylight savings time (DST) is observed in this location during 2012, starting in the spring on March 11 and ending in the fall on November 4.
The median cloud cover ranges from 29% (mostly clear) to 77% (partly cloudy). The sky is cloudiest on January 7 and clearest on September 20. The clearer part of the year begins around April 20. The cloudier part of the year begins around November 21.
On September 20, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 71% of the time, and overcast or mostly cloudy 28% of the time.
On January 7, the cloudiest day of the year, the sky is overcast, mostly cloudy, or partly cloudy 61% of the time, and clear or mostly clear 37% of the time.
The probability that precipitation will be observed at this location varies throughout the year. Precipitation is most likely around July 15, occurring in 57% of days. Precipitation is least likely around October 23, occurring in 29% of days.
Over the entire year, the most common forms of precipitation are thunderstorms, light rain, and moderate rain.
Thunderstorms are the most severe precipitation observed during 51% of those days with precipitation. They are most likely around July 18, when it is observed during 46% of all days.
Light rain is the most severe precipitation observed during 29% of those days with precipitation. It is most likely around January 10, when it is observed during 17% of all days.
Moderate rain is the most severe precipitation observed during 11% of those days with precipitation. It is most likely around January 7, when it is observed during 8% of all days.
During the warm season, which lasts from May 16 to September 27, there is a 48% average chance that precipitation will be observed at some point during a given day. When precipitation does occur it is most often in the form of thunderstorms (75% of days with precipitation have at worst thunderstorms), light rain (16%), and moderate rain (6%).
During the cold season, which lasts from November 30 to February 20, there is a 39% average chance that precipitation will be observed at some point during a given day. When precipitation does occur it is most often in the form of light rain (42% of days with precipitation have at worst light rain), thunderstorms (21%), moderate rain (18%), and heavy rain (10%).
Either snow is exceptionally unlikely to fall at any time during the year at this location or this station does not reliably report precipitation types.
The relative humidity typically ranges from 46% (comfortable) to 95% (very humid) over the course of the year, rarely dropping below 25% (dry) and reaching as high as 100% (very humid).
The air is driest around March 15, at which time the relative humidity drops below 57% (mildly humid) three days out of four; it is most humid around August 12, exceeding 93% (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 year, the dew point typically varies from 34°F (dry) to 76°F (very muggy) and is rarely below 16°F (dry) or above 79°F (oppressive).
There are two periods in the year that are most comfortable: The first is between February 12 and April 29 and the second is between October 6 and December 19. The air feels neither too dry nor too muggy during these periods.
Over the course of the year typical wind speeds vary from 0 mph to 15 mph (calm to moderate breeze), rarely exceeding 20 mph (fresh breeze).
The highest average wind speed of 8 mph (gentle breeze) occurs around February 25, at which time the average daily maximum wind speed is 15 mph (moderate breeze).
The lowest average wind speed of 5 mph (light breeze) occurs around August 15, at which time the average daily maximum wind speed is 11 mph (gentle breeze).