This report describes the typical weather at the Jorge Newbery Airport (Buenos Aires, Argentina) weather station over the course of an average April. It is based on the historical records from 1990 to 2012. Earlier records are either unavailable or unreliable.
Buenos Aires has a warm humid temperate climate with hot summers and no dry season. The area within 25 mi of this station is covered by oceans and seas (43%), croplands (24%), built-up areas (19%), floodplains (9%), and grasslands (4%).
The month of April is characterized by falling daily high temperatures, with daily highs decreasing from 74°F to 68°F over the course of the month, exceeding 80°F or dropping below 62°F only one day in ten.
Over the course of April, the length of the day is gradually decreasing. From the start to the end of the month, the length of the day decreases by 58 minutes, implying an average day-over-day decrease of 1.9 minutes.
The shortest day of the month is April 30 with 10:43 hours of daylight; the longest day is April 1 with 11:41 hours of daylight.
The earliest sunrise is at 7:07am on April 1; the latest sunset is at 6:47pm on April 1; the latest sunrise is at 7:29am on April 30; the earliest sunset is at 6:12pm on April 30.
Daylight savings time (DST) is not observed in 2012.
The median cloud cover ranges from 39% (mostly clear) to 47% (partly cloudy). The trend is for the sky to be becoming cloudier with the median cloud cover increasing by 8% from the start to the end of the month.
On April 15, a representative day, the sky is clear or mostly clear 38% of the time, partly cloudy 12% of the time, and mostly cloudy or overcast 25% of the time.
The average probability that some form of precipitation will be observed in a given day is 33%, with little variation over the course of the month.
Throughout April, the most common forms of precipitation are thunderstorms, moderate rain, light rain, and drizzle.
Thunderstorms are the most severe precipitation observed during 39% of those days with precipitation. They are most likely around April 4, when it is observed during 14% of all days.
Moderate rain is the most severe precipitation observed during 30% of those days with precipitation. It is most likely around April 27, when it is observed during 10% of all days.
Light rain is the most severe precipitation observed during 15% of those days with precipitation. It is most likely around April 2, when it is observed during 6% of all days.
Drizzle is the most severe precipitation observed during 11% of those days with precipitation. It is most likely around April 24, when it is observed during 4% 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 56% (mildly humid) to 89% (very humid) over the course of a typical April, rarely dropping below 38% (comfortable) and reaching as high as 99% (very humid).
The air is driest around April 1, at which time the relative humidity drops below 66% (mildly humid) three days out of four; it is most humid around April 7, rising above 84% (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 48°F (dry) to 63°F (mildy humid) and is rarely below 36°F (dry) or above 70°F (muggy).
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 2 mph to 15 mph (light air to moderate breeze), rarely exceeding 22 mph (fresh breeze).
The highest average wind speed of 9 mph (gentle breeze) occurs around April 1, at which time the average daily maximum wind speed is 15 mph (moderate breeze).
The lowest average wind speed of 8 mph (gentle breeze) occurs around April 30, at which time the average daily maximum wind speed is 14 mph (moderate breeze).