This report describes the typical weather at the Hammond Mun Airport (Hammond, Louisiana, United States) weather station over the course of an average year. It is based on the historical records from 2002 to 2012. Earlier records are either unavailable or unreliable.
Hammond, 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 (76%), croplands (10%), oceans and seas (8%), and lakes and rivers (5%).
Over the course of a year, the temperature typically varies from 42°F to 95°F and is rarely below 30°F or above 99°F.
The warm season lasts from May 23 to September 27 with an average daily high temperature above 89°F. The hottest day of the year is August 17, with an average high of 95°F and low of 75°F.
The cold season lasts from November 24 to February 25 with an average daily high temperature below 69°F. The coldest day of the year is February 3, with an average low of 42°F and high of 63°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 5:58am on June 12 and the latest sunset is at 8:08pm on June 28. The latest sunrise is at 7:18am on November 3 and the earliest sunset is at 5:00pm 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 25% (mostly clear) to 57% (partly cloudy). The sky is cloudiest on February 15 and clearest on August 12. The clearer part of the year begins around April 18. The cloudier part of the year begins around November 23.
On August 12, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 57% of the time, and overcast or mostly cloudy 19% of the time.
On February 15, the cloudiest day of the year, the sky is overcast, mostly cloudy, or partly cloudy 47% of the time, and clear or mostly clear 36% of the time.
The probability that precipitation will be observed at this location varies throughout the year. Precipitation is most likely around July 21, occurring in 63% of days. Precipitation is least likely around December 17, occurring in 29% of days.
Over the entire year, the most common forms of precipitation are thunderstorms, moderate rain, light rain, and heavy rain.
Thunderstorms are the most severe precipitation observed during 51% of those days with precipitation. They are most likely around July 22, when it is observed during 49% of all days.
Moderate rain is the most severe precipitation observed during 18% of those days with precipitation. It is most likely around February 15, when it is observed during 13% of all days.
Light rain is the most severe precipitation observed during 14% of those days with precipitation. It is most likely around October 31, when it is observed during 8% of all days.
Heavy rain is the most severe precipitation observed during 14% of those days with precipitation. It is most likely around June 11, when it is observed during 8% of all days.
During the warm season, which lasts from May 23 to September 27, there is a 51% 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 (71% of days with precipitation have at worst thunderstorms), heavy rain (11%), light rain (10%), and moderate rain (8%).
During the cold season, which lasts from November 24 to February 25, there is a 32% 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 moderate rain (34% of days with precipitation have at worst moderate rain), thunderstorms (27%), heavy rain (17%), and light rain (15%).
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 98% (very humid) over the course of the year, rarely dropping below 24% (dry) and reaching as high as 100% (very humid).
The air is driest around April 12, at which time the relative humidity drops below 56% (mildly humid) three days out of four; it is most humid around April 20, exceeding 96% (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 36°F (dry) to 79°F (oppressive) and is rarely below 22°F (dry) or above 83°F (very oppressive).
There are two periods in the year that are most comfortable: The first is between January 19 and April 20 and the second is between October 20 and December 31. 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 14 mph (calm to moderate breeze), rarely exceeding 20 mph (fresh breeze).
The highest average wind speed of 6 mph (light breeze) occurs around March 2, at which time the average daily maximum wind speed is 14 mph (moderate breeze).
The lowest average wind speed of 2 mph (light air) occurs around July 24, at which time the average daily maximum wind speed is 10 mph (gentle breeze).