This report describes the typical weather at the Djerba Zarzis International Airport (Djerba, Tunisia) weather station over the course of an average October. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.
Djerba has a hot desert climate. The area within 25 mi of this station is covered by oceans and seas (96%) and shrublands (3%).
The month of October is characterized by falling daily high temperatures, with daily highs decreasing from 84°F to 76°F over the course of the month, exceeding 91°F or dropping below 70°F only one day in ten.
Over the course of October, the length of the day is gradually decreasing. From the start to the end of the month, the length of the day decreases by 60 minutes, implying an average day-over-day decrease of 1.9 minutes.
The shortest day of the month is October 31 with 10:50 hours of daylight; the longest day is October 1 with 11:49 hours of daylight.
The earliest sunrise is at 6:11am on October 1; the latest sunset is at 6:01pm on October 1; the latest sunrise is at 6:36am on October 31; the earliest sunset is at 5:25pm on October 31.
Daylight saving time (DST) is not observed in 2012.
The median cloud cover is 37% (mostly clear) and does not vary substantially over the course of the month.
On October 16, a representative day, the sky is clear or mostly clear 58% of the time, partly cloudy 30% of the time, and mostly cloudy or overcast 8% of the time.
The average probability that some form of precipitation will be observed in a given day is 23%, with little variation over the course of the month.
Throughout October, the most common forms of precipitation are thunderstorms, moderate rain, and light rain.
Thunderstorms are the most severe precipitation observed during 49% of those days with precipitation. They are most likely around October 12, when it is observed during 12% of all days.
Moderate rain is the most severe precipitation observed during 31% of those days with precipitation. It is most likely around October 31, when it is observed during 9% of all days.
Light rain is the most severe precipitation observed during 19% of those days with precipitation. It is most likely around October 9, when it is observed during 5% 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 96% (very humid) over the course of a typical October, rarely dropping below 30% (comfortable) and reaching as high as 100% (very humid).
The air is driest around October 12, at which time the relative humidity drops below 59% (mildly humid) three days out of four; it is most humid around October 27, 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 October, the dew point typically varies from 53°F (very comfortable) to 70°F (muggy) and is rarely below 44°F (dry) or above 76°F (very muggy).
Over the course of October typical wind speeds vary from 2 mph to 15 mph (light air to moderate breeze), rarely exceeding 23 mph (fresh breeze).
The highest average wind speed of 9 mph (gentle breeze) occurs around October 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 October 25, at which time the average daily maximum wind speed is 14 mph (moderate breeze).