Summer Weather in Karaj Iran

Daily high temperatures increase by 5°F, from 84°F to 89°F, rarely falling below 78°F or exceeding 99°F. The highest daily average high temperature is 94°F on July 19.

Daily low temperatures are around 68°F, rarely falling below 58°F or exceeding 76°F. The highest daily average low temperature is 71°F on July 24.

For reference, on July 18, the hottest day of the year, temperatures in Karaj typically range from 71°F to 94°F, while on January 23, the coldest day of the year, they range from 28°F to 42°F.

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

Mulvane, United States (6,986 miles away) is the far-away foreign place with temperatures most similar to Karaj (view comparison).

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The summer in Karaj experiences decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 11% to 1%. The lowest chance of overcast or mostly cloudy conditions is 0% on August 29.

The clearest day of the summer is August 29, with clear, mostly clear, or partly cloudy conditions 100% of the time.

For reference, on April 18, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 39%, while on August 29, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 100%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Karaj, the chance of a wet day over the course of the summer is increasing, starting the season at 4% and ending it at 9%.

For reference, the year's highest daily chance of a wet day is 23% on November 9, and its lowest chance is 3% on August 5.

Rainfall

To show variation within the season and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during the summer in Karaj is essentially constant, remaining about 0.3 inches throughout, and rarely exceeding 1.1 inches.

The lowest average 31-day accumulation is 0.1 inches on June 17.

Over the course of the summer in Karaj, the length of the day is rapidly decreasing. From the start to the end of the season, the length of the day decreases by 1 hour, 29 minutes, implying an average daily decrease of 59 seconds, and weekly decrease of 6 minutes, 50 seconds.

The shortest day of the summer is August 31, with 12 hours, 57 minutes of daylight and the longest day is June 20, with 14 hours, 36 minutes of daylight.

The earliest sunrise of the summer in Karaj is 4:49 AM on June 12 and the latest sunrise is 48 minutes later at 5:37 AM on August 31.

The latest sunset is 7:26 PM on June 28 and the earliest sunset is 52 minutes earlier at 6:34 PM on August 31.

Daylight saving time is not observed in Karaj during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 4:49 AM and sets 14 hours, 36 minutes later, at 7:25 PM, while on December 21, the shortest day of the year, it rises at 7:12 AM and sets 9 hours, 44 minutes later, at 4:56 PM.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

The figure below presents a compact representation of key lunar data for the summer of 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

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 chance that a given day will be muggy in Karaj is essentially constant during the summer, remaining around 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 in Karaj is gradually decreasing during the summer, decreasing from 6.5 miles per hour to 5.8 miles per hour over the course of the season.

For reference, on April 18, the windiest day of the year, the daily average wind speed is 6.8 miles per hour, while on December 15, the calmest day of the year, the daily average wind speed is 4.7 miles per hour.

The hourly average wind direction in Karaj throughout the summer is predominantly from the south, with a peak proportion of 51% on July 10.

Karaj 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 surface water temperature in Karaj is rapidly increasing during the summer, rising by 9°F, from 72°F to 81°F, over the course of the season.

The highest average surface water temperature during the summer is 82°F on August 8.

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

The growing season in Karaj typically lasts for 8.2 months (251 days), from around March 20 to around November 26, rarely starting before March 1 or after April 7, and rarely ending before November 7 or after December 15.

The summer in Karaj is reliably fully within the growing season.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

The average accumulated growing degree days in Karaj are very rapidly increasing during the summer, increasing by 2,642°F, from 962°F to 3,604°F, over the course of the season.

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 in Karaj is decreasing during the summer, falling by 1.2 kWh, from 8.3 kWh to 7.1 kWh, over the course of the season.

The highest average daily incident shortwave solar energy during the summer is 8.5 kWh on June 18.

For the purposes of this report, the geographical coordinates of Karaj are 35.833 deg latitude, 50.992 deg longitude, and 4,400 ft elevation.

The topography within 2 miles of Karaj contains very significant variations in elevation, with a maximum elevation change of 1,781 feet and an average elevation above sea level of 4,541 feet. Within 10 miles contains very significant variations in elevation (6,647 feet). Within 50 miles also contains extreme variations in elevation (14,531 feet).

The area within 2 miles of Karaj is covered by shrubs (60%) and grassland (31%), within 10 miles by shrubs (60%) and sparse vegetation (14%), and within 50 miles by shrubs (58%) and sparse vegetation (12%).