This report describes the typical weather at the Cape Town International Airport (Cape Town, South Africa) weather station over the course of an average March. 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 March is characterized by gradually falling daily high temperatures, with daily highs around 78°F throughout the month, exceeding 87°F or dropping below 70°F only one day in ten.
Over the course of March, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 1:04 hours, implying an average day-over-day decrease of 2.1 minutes.
The shortest day of the month is March 31 with 11:44 hours of daylight; the longest day is March 1 with 12:48 hours of daylight.
The earliest sunrise is at 6:34am on March 1; the latest sunset is at 7:22pm on March 1; the latest sunrise is at 6:57am on March 31; the earliest sunset is at 6:41pm on March 31.
Daylight savings time (DST) is not observed in 2012.
The median cloud cover is 28% (mostly clear) and does not vary substantially over the course of the month.
On March 16, a representative day, the sky is clear or mostly clear 58% of the time, partly cloudy 8% of the time, and mostly cloudy or overcast 17% of the time.
The probability that precipitation will be observed at this location varies throughout the month. Precipitation is most likely around March 31, occurring in 22% of days. Precipitation is least likely around March 3, occurring in 16% of days.
Throughout March, the most common forms of precipitation are moderate rain, light rain, and drizzle.
Moderate rain is the most severe precipitation observed during 40% of those days with precipitation. It is most likely around March 28, when it is observed during 9% of all days.
Light rain is the most severe precipitation observed during 39% of those days with precipitation. It is most likely around March 31, when it is observed during 9% of all days.
Drizzle is the most severe precipitation observed during 12% of those days with precipitation. It is most likely around March 4, when it is observed during 3% of all days.
Either snow is exceptionally unlikely to fall at this location in March or this station does not reliably report precipitation types.
The relative humidity typically ranges from 46% (comfortable) to 94% (very humid) over the course of a typical March, rarely dropping below 31% (comfortable) and reaching as high as 100% (very humid).
The air is driest around March 5, at which time the relative humidity drops below 53% (mildly humid) three days out of four; it is most humid around March 31, rising above 91% (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 March, the dew point typically varies from 51°F (very comfortable) to 62°F (mildy humid) and is rarely below 45°F (dry) or above 66°F (muggy).
The time of the month between March 1 and March 31 is the most comfortable, with dew points that are neither too dry nor too muggy.
Over the course of March typical wind speeds vary from 2 mph to 21 mph (light air to fresh breeze), rarely exceeding 28 mph (strong breeze).
The highest average wind speed of 13 mph (moderate breeze) occurs around March 3, at which time the average daily maximum wind speed is 21 mph (fresh breeze).
The lowest average wind speed of 11 mph (gentle breeze) occurs around March 31, at which time the average daily maximum wind speed is 19 mph (fresh breeze).