This report describes the typical weather at the Sabiha Gökçen International Airport (Istanbul, Turkey) weather station over the course of an average April. It is based on the historical records from 2006 to 2012. Earlier records are either unavailable or unreliable.
Istanbul has a mediterranean climate with dry hot summers and mild winters. The area within 25 mi of this station is covered by croplands (62%), oceans and seas (33%), and built-up areas (2%).
The month of April is characterized by rising daily high temperatures, with daily highs increasing from 60°F to 65°F over the course of the month, exceeding 73°F or dropping below 51°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 1:15 hours, implying an average day-over-day increase of 2.5 minutes.
The shortest day of the month is April 1 with 12:42 hours of daylight; the longest day is April 30 with 13:57 hours of daylight.
The earliest sunrise is at 6:02am on April 30; the latest sunset is at 7:59pm on April 30; the latest sunrise is at 6:45am on April 1; the earliest sunset is at 7:28pm on April 1.
Daylight savings time is observed in 2012 but it neither starts nor ends in April, so the entire month is in daylight time.
The median cloud cover ranges from 73% (partly cloudy) to 80% (partly cloudy). The trend is for the sky to be clearing with the median cloud cover decreasing by 6% from the start to the end of the month.
On April 15, a representative day, the sky is clear or mostly clear 8% of the time, partly cloudy 19% of the time, and mostly cloudy or overcast 39% of the time.
The probability that precipitation will be observed at this location varies throughout the month. Precipitation is most likely around April 5, occurring in 41% of days. Precipitation is least likely around April 30, occurring in 34% of days.
Throughout April, the most common forms of precipitation are light rain, moderate rain, and thunderstorms.
Light rain is the most severe precipitation observed during 50% of those days with precipitation. It is most likely around April 5, when it is observed during 21% of all days.
Moderate rain is the most severe precipitation observed during 30% of those days with precipitation. It is most likely around April 30, when it is observed during 12% of all days.
Thunderstorms are the most severe precipitation observed during 16% of those days with precipitation. They are most likely around April 24, when it is observed during 7% of all days.
The likelihood of snow falling is highest around April 1, occurring in 3% of days.
Either snow rarely accumulates at this location in April or snow depth measurements are unavailable or unreliable.
The relative humidity typically ranges from 44% (comfortable) to 87% (very humid) over the course of a typical April, rarely dropping below 29% (dry), or exceeding 95% (very humid).
The air is driest around April 15, at which time the relative humidity drops below 52% (mildly humid) three days out of four; it is most humid around April 30, 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 35°F (dry) to 49°F (dry) and is rarely below 30°F (dry) or above 54°F (very comfortable).
Over the course of April typical wind speeds vary from 1 mph to 17 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 18, at which time the average daily maximum wind speed is 17 mph (moderate breeze).
The lowest average wind speed of 8 mph (gentle breeze) occurs around April 6, at which time the average daily maximum wind speed is 15 mph (moderate breeze).