This report describes the typical weather at the Sabiha Gökçen International Airport (Istanbul, Turkey) weather station over the course of an average October. 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 October is characterized by rapidly falling daily high temperatures, with daily highs decreasing from 73°F to 63°F over the course of the month, exceeding 78°F or dropping below 56°F only one day in ten.
Over the course of October, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 1:18 hours, implying an average day-over-day decrease of 2.5 minutes.
The shortest day of the month is October 31 with 10:27 hours of daylight; the longest day is October 1 with 11:45 hours of daylight.
The earliest sunrise is at 6:29am on October 28; the latest sunset is at 6:44pm on October 1; the latest sunrise is at 7:27am on October 27; the earliest sunset is at 5:00pm on October 31.
Daylight savings time (DST) ends at 3:00am on October 28, 2012, shifting sunrise and sunset to an hour earlier.
The median cloud cover is 72% (partly cloudy) and does not vary substantially over the course of the month.
On October 16, a representative day, the sky is clear or mostly clear 7% of the time, partly cloudy 28% of the time, and mostly cloudy or overcast 41% of the time.
The probability that precipitation will be observed at this location varies throughout the month. Precipitation is most likely around October 19, occurring in 45% of days. Precipitation is least likely around October 31, occurring in 41% of days.
Throughout October, the most common forms of precipitation are light rain, thunderstorms, and moderate rain.
Light rain is the most severe precipitation observed during 52% of those days with precipitation. It is most likely around October 21, when it is observed during 24% of all days.
Thunderstorms are the most severe precipitation observed during 27% of those days with precipitation. They are most likely around October 1, when it is observed during 14% of all days.
Moderate rain is the most severe precipitation observed during 19% of those days with precipitation. It is most likely around October 30, when it is observed during 10% of all days.
Either snow is exceptionally unlikely to fall at this location in October or this station does not reliably report precipitation types.
The relative humidity typically ranges from 49% (comfortable) to 89% (very humid) over the course of a typical October, rarely dropping below 38% (comfortable), or exceeding 94% (very humid).
The air is driest around October 2, at which time the relative humidity drops below 54% (mildly humid) three days out of four; it is most humid around October 23, rising above 86% (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 October, the dew point typically varies from 44°F (dry) to 58°F (comfortable) and is rarely below 38°F (dry) or above 62°F (mildy humid).
The time of the month between October 1 and October 31 is the most comfortable, with dew points that are neither too dry nor too muggy.
Over the course of October typical wind speeds vary from 2 mph to 16 mph (light air to moderate breeze), rarely exceeding 21 mph (fresh breeze).
The highest average wind speed of 9 mph (gentle breeze) occurs around October 18, 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 October 26, at which time the average daily maximum wind speed is 14 mph (moderate breeze).