This report describes the typical weather at the Houari Boumedienne Airport (Algiers, Algeria) weather station over the course of an average April. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.
Algiers has a mediterranean climate with dry hot summers and mild winters. The area within 25 mi of this station is covered by croplands (50%), oceans and seas (39%), and forests (8%).
The month of April is characterized by gradually rising daily high temperatures, with daily highs around 70°F throughout the month, exceeding 79°F or dropping below 61°F only one day in ten.
Over the course of April, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 1:03 hours, implying an average day-over-day increase of 2.1 minutes.
The shortest day of the month is April 1 with 12:37 hours of daylight; the longest day is April 30 with 13:40 hours of daylight.
The earliest sunrise is at 5:54am on April 30; the latest sunset is at 7:35pm on April 30; the latest sunrise is at 6:33am on April 1; the earliest sunset is at 7:10pm on April 1.
Daylight saving time (DST) is not observed in 2012.
The median cloud cover is 49% (partly cloudy) and does not vary substantially over the course of the month.
On April 15, a representative day, the sky is clear or mostly clear 39% of the time, partly cloudy 32% of the time, and mostly cloudy or overcast 21% of the time.
The average probability that some form of precipitation will be observed in a given day is 35%, with little variation over the course of the month.
Throughout April, the most common forms of precipitation are moderate rain, thunderstorms, and light rain.
Moderate rain is the most severe precipitation observed during 45% of those days with precipitation. It is most likely around April 1, when it is observed during 17% of all days.
Thunderstorms are the most severe precipitation observed during 36% of those days with precipitation. They are most likely around April 27, when it is observed during 13% of all days.
Light rain is the most severe precipitation observed during 17% of those days with precipitation. It is most likely around April 7, when it is observed during 6% of all days.
Either snow is exceptionally unlikely to fall at this location in April or this station does not reliably report precipitation types.
The relative humidity typically ranges from 51% (mildly humid) to 97% (very humid) over the course of a typical April, rarely dropping below 35% (comfortable) and reaching as high as 100% (very humid).
The air is driest around April 1, at which time the relative humidity drops below 59% (mildly humid) three days out of four; it is most humid around April 23, rising above 94% (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 April, the dew point typically varies from 43°F (dry) to 57°F (comfortable) and is rarely below 36°F (dry) or above 62°F (mildy humid).
The time of the month between April 1 and April 30 is the most comfortable, with dew points that are neither too dry nor too muggy.
Over the course of April typical wind speeds vary from 0 mph to 16 mph (calm to moderate breeze), rarely exceeding 25 mph (strong breeze).
The highest average wind speed of 7 mph (light breeze) occurs around April 7, at which time the average daily maximum wind speed is 16 mph (moderate breeze).
The lowest average wind speed of 7 mph (light breeze) occurs around April 29, at which time the average daily maximum wind speed is 16 mph (moderate breeze).