This report describes the typical weather at the Cape Town International Airport (Cape Town, South Africa) weather station over the course of an average April. It is based on the historical records from 1994 to 2012. Earlier records are either unavailable or unreliable.
Cape Town has a mediterranean climate with dry warm summers and mild winters. The area within 25 mi of this station is covered by oceans and seas (40%), grasslands (33%), croplands (17%), built-up areas (6%), and forests (5%).
The month of April is characterized by falling daily high temperatures, with daily highs ranging from 76°F to 70°F over the course of the month, exceeding 85°F or dropping below 63°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 57 minutes, implying an average day-over-day decrease of 1.9 minutes.
The shortest day of the month is April 30 with 10:45 hours of daylight; the longest day is April 1 with 11:42 hours of daylight.
The earliest sunrise is at 6:58am on April 1; the latest sunset is at 6:40pm on April 1; the latest sunrise is at 7:20am on April 30; the earliest sunset is at 6:05pm on April 30.
Daylight savings time (DST) is not observed in 2012.
The median cloud cover ranges from 31% (mostly clear) to 43% (partly cloudy). The trend is for the sky to be becoming cloudier with the median cloud cover increasing by 12% from the start to the end of the month.
On April 1, the clearest day of the month, the sky is clear, mostly clear, or partly cloudy 62% of the time, and overcast or mostly cloudy 20% of the time.
On April 30, the cloudiest day of the month, the sky is overcast, mostly cloudy, or partly cloudy 39% of the time, and clear or mostly clear 44% of the time.
The probability that precipitation will be observed at this location varies throughout the month. Precipitation is most likely around April 30, occurring in 32% of days. Precipitation is least likely around April 1, occurring in 22% of days.
Throughout April, the most common forms of precipitation are moderate rain and light rain.
Moderate rain is the most severe precipitation observed during 45% of those days with precipitation. It is most likely around April 30, when it is observed during 15% of all days.
Light rain is the most severe precipitation observed during 40% of those days with precipitation. It is most likely around April 30, when it is observed during 13% 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 47% (comfortable) to 96% (very humid) over the course of a typical April, rarely dropping below 30% (comfortable) and reaching as high as 100% (very humid).
The air is driest around April 4, at which time the relative humidity drops below 57% (mildly humid) three days out of four; it is most humid around April 29, 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 47°F (dry) to 60°F (comfortable) and is rarely below 40°F (dry) or above 63°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 1 mph to 19 mph (light air to fresh breeze), rarely exceeding 27 mph (strong breeze).
The highest average wind speed of 11 mph (gentle breeze) occurs around April 1, at which time the average daily maximum wind speed is 19 mph (fresh breeze).
The lowest average wind speed of 9 mph (gentle breeze) occurs around April 30, at which time the average daily maximum wind speed is 16 mph (moderate breeze).