This report describes the typical weather at the Mehrabad International Airport (Tehran, Iran) weather station over the course of an average November. It is based on the historical records from 1996 to 2012. Earlier records are either unavailable or unreliable.
Tehran has a cold semi-arid steppe climate. The area within 25 mi of this station is covered by shrublands (56%), grasslands (20%), croplands (16%), and built-up areas (8%).
The month of November is characterized by rapidly falling daily high temperatures, with daily highs decreasing from 68°F to 55°F over the course of the month, exceeding 75°F or dropping below 47°F only one day in ten.
Over the course of November, the length of the day is gradually decreasing. From the start to the end of the month, the length of the day decreases by 46 minutes, implying an average day-over-day decrease of 1.5 minutes.
The shortest day of the month is November 30 with 9:56 hours of daylight; the longest day is November 1 with 10:42 hours of daylight.
The earliest sunrise is at 6:27am on November 1; the latest sunset is at 5:09pm on November 1; the latest sunrise is at 6:55am on November 30; the earliest sunset is at 4:51pm on November 29.
Daylight savings time is observed in 2012 but it neither starts nor ends in November, so the entire month is in standard time.
The median cloud cover ranges from 39% (mostly clear) to 53% (partly cloudy). The trend is for the sky to be becoming cloudier with the median cloud cover increasing by 13% from the start to the end of the month.
On November 1, the clearest day of the month, the sky is clear, mostly clear, or partly cloudy 61% of the time, and overcast or mostly cloudy 24% of the time.
On November 26, the cloudiest day of the month, the sky is overcast, mostly cloudy, or partly cloudy 51% of the time, and clear or mostly clear 38% of the time.
The probability that precipitation will be observed at this location varies throughout the month. Precipitation is most likely around November 24, occurring in 33% of days. Precipitation is least likely around November 1, occurring in 25% of days.
Throughout November, the most common forms of precipitation are moderate rain and light rain.
Moderate rain is the most severe precipitation observed during 58% of those days with precipitation. It is most likely around November 25, when it is observed during 19% of all days.
Light rain is the most severe precipitation observed during 18% of those days with precipitation. It is most likely around November 24, when it is observed during 6% of all days.
The likelihood of snow falling is highest around November 28, occurring in 3% of days.
Either snow rarely accumulates at this location in November or snow depth measurements are unavailable or unreliable.
The relative humidity typically ranges from 31% (comfortable) to 74% (humid) over the course of a typical November, rarely dropping below 16% (dry), or exceeding 94% (very humid).
The air is driest around November 1, at which time the relative humidity drops below 38% (comfortable) three days out of four; it is most humid around November 30, rising above 61% (mildly 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 November, the dew point typically varies from 26°F (dry) to 43°F (dry) and is rarely below 15°F (dry) or above 51°F (very comfortable).
Over the course of November typical wind speeds vary from 0 mph to 11 mph (calm to gentle breeze), rarely exceeding 24 mph (fresh breeze).
The highest average wind speed of 5 mph (light breeze) occurs around November 1, at which time the average daily maximum wind speed is 11 mph (gentle breeze).
The lowest average wind speed of 4 mph (light breeze) occurs around November 30, at which time the average daily maximum wind speed is 10 mph (gentle breeze).