Average Weather at Mehrabad International Airport Iran

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2. Iran
3. Tehrān
4. Mehrabad International Airport

At Mehrabad International Airport, the summers are hot, arid, and clear and the winters are chilly, dry, and mostly clear. Over the course of the year, the temperature typically varies from 34°F to 97°F and is rarely below 26°F or above 103°F.

The hot season lasts for 3.6 months, from May 29 to September 18, with an average daily high temperature above 87°F. The hottest day of the year is July 17, with an average high of 97°F and low of 77°F.

The cool season lasts for 3.5 months, from November 23 to March 8, with an average daily high temperature below 57°F. The coldest day of the year is January 23, with an average low of 34°F and high of 47°F.

The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

At Mehrabad International Airport, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.

The clearer part of the year at Mehrabad International Airport begins around May 22 and lasts for 4.7 months, ending around October 14. On August 30, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 100% of the time, and overcast or mostly cloudy 0% of the time.

The cloudier part of the year begins around October 14 and lasts for 7.3 months, ending around May 22. On April 20, the cloudiest day of the year, the sky is overcast or mostly cloudy 37% of the time, and clear, mostly clear, or partly cloudy 63% of the time.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days at Mehrabad International Airport varies throughout the year.

The wetter season lasts 7.0 months, from September 18 to April 18, with a greater than 11% chance of a given day being a wet day. The chance of a wet day peaks at 19% on November 19.

The drier season lasts 5.0 months, from April 18 to September 18. The smallest chance of a wet day is 2% on June 6.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 18% on November 19.

Rainfall

To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Mehrabad International Airport experiences some seasonal variation in monthly rainfall.

The rainy period of the year lasts for 7.4 months, from September 17 to April 30, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around November 7, with an average total accumulation of 1.2 inches.

The rainless period of the year lasts for 4.6 months, from April 30 to September 17. The least rain falls around June 18, with an average total accumulation of 0.1 inches.

The length of the day at Mehrabad International Airport varies significantly over the course of the year. In 2017, the shortest day is December 21, with 9 hours, 44 minutes of daylight; the longest day is June 21, with 14 hours, 35 minutes of daylight.

The earliest sunrise is at 5:48 AM on June 13, and the latest sunrise is 1 hour, 27 minutes later at 7:15 AM on January 6. The earliest sunset is at 4:51 PM on December 6, and the latest sunset is 3 hours, 34 minutes later at 8:24 PM on June 29.

Daylight saving time (DST) is observed at Mehrabad International Airport during 2017, starting in the spring on March 22, lasting 6.0 months, and ending in the fall on September 21.

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

The perceived humidity level at Mehrabad International Airport, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, remaining a virtually constant 0% throughout.

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed at Mehrabad International Airport experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 7.3 months, from February 10 to September 20, with average wind speeds of more than 3.1 miles per hour. The windiest day of the year is July 3, with an average hourly wind speed of 3.7 miles per hour.

The calmer time of year lasts for 4.6 months, from September 20 to February 10. The calmest day of the year is December 16, with an average hourly wind speed of 2.4 miles per hour.

The predominant average hourly wind direction at Mehrabad International Airport varies throughout the year.

The wind is most often from the west for 3.5 months, from January 31 to May 17, with a peak percentage of 36% on April 18. The wind is most often from the south for 5.0 months, from May 17 to October 16, with a peak percentage of 53% on July 23. The wind is most often from the north for 2.9 months, from November 3 to January 31, with a peak percentage of 34% on January 1.

Mehrabad International Airport is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average water temperature experiences significant seasonal variation over the course of the year.

The time of year with warmer water lasts for 3.5 months, from June 17 to October 3, with an average temperature above 76°F. The day of the year with the warmest water is August 8, with an average temperature of 82°F.

The time of year with cooler water lasts for 3.7 months, from December 27 to April 17, with an average temperature below 57°F. The day of the year with the coolest water is February 25, with an average temperature of 51°F.

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy experiences extreme seasonal variation over the course of the year.

The brighter period of the year lasts for 3.4 months, from May 10 to August 23, with an average daily incident shortwave energy per square meter above 7.4 kWh. The brightest day of the year is June 19, with an average of 8.5 kWh.

The darker period of the year lasts for 3.4 months, from October 31 to February 12, with an average daily incident shortwave energy per square meter below 4.0 kWh. The darkest day of the year is December 16, with an average of 2.8 kWh.

For the purposes of this report, the geographical coordinates of Mehrabad International Airport are 35.689 deg latitude, 51.313 deg longitude, and 3,878 ft elevation.

The topography within 2 miles of Mehrabad International Airport contains only modest variations in elevation, with a maximum elevation change of 459 feet and an average elevation above sea level of 3,887 feet. Within 10 miles contains only modest variations in elevation (5,696 feet). Within 50 miles also contains extreme variations in elevation (16,535 feet).

The area within 2 miles of Mehrabad International Airport is covered by artificial surfaces (100%), within 10 miles by artificial surfaces (62%) and shrubs (17%), and within 50 miles by shrubs (58%) and sparse vegetation (10%).

This report illustrates the typical weather at Mehrabad International Airport, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

Temperature and Dew Point

Mehrabad International Airport has a weather station that reported reliably enough during the analysis period that we have included it in our network. When available, historical temperature and dew point measurements are taken directly from this weather station. These records are obtained from NOAA's Integrated Surface Hourly data set, falling back on ICAO METAR records as required.

In the case of missing or erroneous measurements from this station, we fall back on records from nearby stations, adjusted according to typical seasonal and diurnal intra-station differences. For a given day of the year and hour of the day, the fallback station is selected to minimize the prediction error over the years for which there are measurements for both stations.

The stations on which we may fall back are Tehran Imam Khomeini International Airport, Ramsar Airport, Qazvin Airport, and Semnan.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , by Jean Meeus.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.

Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.

Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for aiports and weather stations are provided by AskGeo.com .

Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.