Fall Weather in Orūmīyeh Iran

Daily high temperatures decrease by 37°F, from 84°F to 46°F, rarely falling below 37°F or exceeding 90°F.

Daily low temperatures decrease by 27°F, from 57°F to 30°F, rarely falling below 22°F or exceeding 61°F.

For reference, on July 24, the hottest day of the year, temperatures in Orūmīyeh typically range from 63°F to 88°F, while on January 23, the coldest day of the year, they range from 21°F to 37°F.

The figure below shows you a compact characterization of the hourly average fall 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.

Lancaster, Ohio, United States (6,159 miles away) and Bedminster, New Jersey, United States (5,831 miles) are the far-away foreign places with temperatures most similar to Orūmīyeh (view comparison).

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The fall in Orūmīyeh experiences very rapidly increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 1% to 40%.

The clearest day of the fall is September 2, with clear, mostly clear, or partly cloudy conditions 99% of the time.

For reference, on December 2, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 40%, while on July 15, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 99%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Orūmīyeh, the chance of a wet day over the course of the fall is very rapidly increasing, starting the season at 2% and ending it at 12%.

For reference, the year's highest daily chance of a wet day is 19% on May 1, and its lowest chance is 1% on August 8.

Over the course of the fall in Orūmīyeh, the chance of a day with only rain increases from 2% to 9%, the chance of a day with mixed snow and rain increases from 0% to 2%, and the chance of a day with only snow remains an essentially constant 1% throughout.

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 fall in Orūmīyeh is increasing, starting the season at 0.1 inches, when it rarely exceeds 0.4 inches or falls below -0.0 inches, and ending the season at 0.7 inches, when it rarely exceeds 1.5 inches.

The highest average 31-day accumulation is 1.0 inches on November 5.

Snowfall

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day snowfall during the fall in Orūmīyeh is increasing, starting the season at -0.0 inches, when it rarely exceeds -0.0 inches or falls below -0.0 inches, and ending the season at 1.6 inches, when it rarely exceeds 4.1 inches or falls below -0.0 inches.

Over the course of the fall in Orūmīyeh, the length of the day is very rapidly decreasing. From the start to the end of the season, the length of the day decreases by 3 hours, 12 minutes, implying an average daily decrease of 2 minutes, 8 seconds, and weekly decrease of 14 minutes, 56 seconds.

The shortest day of the fall is November 30, with 9 hours, 47 minutes of daylight and the longest day is September 1, with 12 hours, 59 minutes of daylight.

The earliest sunrise of the fall in Orūmīyeh is 5:59 AM on September 1 and the latest sunrise is 1 hour, 25 minutes later at 7:24 AM on November 30.

The latest sunset is 6:59 PM on September 1 and the earliest sunset is 1 hour, 47 minutes earlier at 5:11 PM on November 30.

Daylight saving time is not observed in Orūmīyeh during 2026.

For reference, on June 21, the longest day of the year, the Sun rises at 5:08 AM and sets 14 hours, 46 minutes later, at 7:54 PM, while on December 21, the shortest day of the year, it rises at 7:40 AM and sets 9 hours, 34 minutes later, at 5:14 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 fall of 2026. 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 Orūmīyeh is essentially constant during the fall, remaining around 0% throughout.

For reference, on July 28, the muggiest day of the year, there are muggy conditions 0% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.

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 Orūmīyeh is essentially constant during the fall, remaining within 0.3 miles per hour of 6.5 miles per hour throughout.

For reference, on April 18, the windiest day of the year, the daily average wind speed is 8.8 miles per hour, while on September 2, the calmest day of the year, the daily average wind speed is 6.3 miles per hour.

The lowest daily average wind speed during the fall is 6.3 miles per hour on September 2.

The wind direction in Orūmīyeh during the fall is predominantly out of the north from September 1 to September 9 and the west from September 9 to November 30.

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 Orūmīyeh typically lasts for 7.3 months (223 days), from around March 31 to around November 10, rarely starting before March 15 or after April 21, and rarely ending before October 20 or after November 27.

During the fall in Orūmīyeh, the chance that a given day is within the growing season is very rapidly decreasing falling from 100% to 7% over the course of the 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 Orūmīyeh are rapidly increasing during the fall, increasing by 704°F, from 2,621°F to 3,325°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 Orūmīyeh is very rapidly decreasing during the fall, falling by 4.3 kWh, from 7.1 kWh to 2.8 kWh, over the course of the season.

For the purposes of this report, the geographical coordinates of Orūmīyeh are 37.553 deg latitude, 45.076 deg longitude, and 4,429 ft elevation.

The topography within 2 miles of Orūmīyeh contains only modest variations in elevation, with a maximum elevation change of 397 feet and an average elevation above sea level of 4,401 feet. Within 10 miles contains only modest variations in elevation (3,379 feet). Within 50 miles also contains extreme variations in elevation (9,849 feet).

The area within 2 miles of Orūmīyeh is covered by artificial surfaces (62%), sparse vegetation (18%), and bare soil (12%), within 10 miles by cropland (41%) and shrubs (38%), and within 50 miles by shrubs (33%) and water (23%).