Climate and Average Weather Year Round in Hamadān Iran

In Hamadān, the summers are hot, arid, and clear and the winters are very cold, snowy, and mostly clear. Over the course of the year, the temperature typically varies from 24°F to 93°F and is rarely below 15°F or above 98°F.

Based on the beach/pool score, the best time of year to visit Hamadān for hot-weather activities is from mid June to late August.

The hot season lasts for 3.4 months, from June 4 to September 18, with an average daily high temperature above 82°F. The hottest month of the year in Hamadān is July, with an average high of 93°F and low of 66°F.

The cold season lasts for 3.5 months, from November 25 to March 8, with an average daily high temperature below 51°F. The coldest month of the year in Hamadān is January, with an average low of 25°F and high of 41°F.

In Hamadān, 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 in Hamadān begins around May 21 and lasts for 4.7 months, ending around October 11.

The clearest month of the year in Hamadān is August, during which on average the sky is clear, mostly clear, or partly cloudy 100% of the time.

The cloudier part of the year begins around October 11 and lasts for 7.3 months, ending around May 21.

The cloudiest month of the year in Hamadān is December, during which on average the sky is overcast or mostly cloudy 36% 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 in Hamadān varies throughout the year.

The wetter season lasts 7.0 months, from October 10 to May 11, with a greater than 11% chance of a given day being a wet day. The month with the most wet days in Hamadān is November, with an average of 5.7 days with at least 0.04 inches of precipitation.

The drier season lasts 5.0 months, from May 11 to October 10. The month with the fewest wet days in Hamadān is July, with an average of 0.7 days with at least 0.04 inches of precipitation.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. The month with the most days of rain alone in Hamadān is November, with an average of 5.2 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 20% on November 9.

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. Hamadān experiences some seasonal variation in monthly rainfall.

The rainy period of the year lasts for 7.7 months, from September 28 to May 17, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain in Hamadān is November, with an average rainfall of 1.5 inches.

The rainless period of the year lasts for 4.3 months, from May 17 to September 28. The month with the least rain in Hamadān is July, with an average rainfall of 0.1 inches.

Snowfall

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Hamadān experiences some seasonal variation in monthly snowfall.

The snowy period of the year lasts for 3.3 months, from November 27 to March 6, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow in Hamadān is January, with an average snowfall of 2.4 inches.

The snowless period of the year lasts for 8.7 months, from March 6 to November 27. The least snow falls around July 25, with an average total accumulation of 0.0 inches.

The length of the day in Hamadān varies significantly over the course of the year. In 2024, the shortest day is December 21, with 9 hours, 49 minutes of daylight; the longest day is June 21, with 14 hours, 30 minutes of daylight.

The earliest sunrise is at 5:01 AM on June 13, and the latest sunrise is 2 hours, 22 minutes later at 7:24 AM on January 7. The earliest sunset is at 5:04 PM on December 4, and the latest sunset is 2 hours, 29 minutes later at 7:33 PM on June 28.

Daylight saving time (DST) is not observed in Hamadān during 2024.

The figure below presents a compact representation of key lunar data for 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.

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 in Hamadān, 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 in Hamadān experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 3.6 months, from January 19 to May 6, with average wind speeds of more than 8.5 miles per hour. The windiest month of the year in Hamadān is March, with an average hourly wind speed of 9.4 miles per hour.

The calmer time of year lasts for 8.4 months, from May 6 to January 19. The calmest month of the year in Hamadān is October, with an average hourly wind speed of 7.5 miles per hour.

The predominant average hourly wind direction in Hamadān varies throughout the year.

The wind is most often from the east for 3.2 months, from June 12 to September 17, with a peak percentage of 65% on July 31. The wind is most often from the west for 8.8 months, from September 17 to June 12, with a peak percentage of 43% on January 1.

To characterize how pleasant the weather is in Hamadān throughout the year, we compute two travel scores.

The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best times of year to visit Hamadān for general outdoor tourist activities are from late May to late June and from late August to early October, with a peak score in the second week of September.

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Hamadān for hot-weather activities is from mid June to late August, with a peak score in the third week of July.

Methodology

For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.

Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.

Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.

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 Hamadān typically lasts for 7.5 months (227 days), from around March 31 to around November 13, rarely starting before March 13 or after April 20, and rarely ending before October 28 or after November 29.

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.

Based on growing degree days alone, the first spring blooms in Hamadān should appear around April 9, only rarely appearing before March 25 or after April 23.

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 3.3 months, from May 14 to August 23, with an average daily incident shortwave energy per square meter above 7.7 kWh. The brightest month of the year in Hamadān is June, with an average of 8.8 kWh.

The darker period of the year lasts for 3.5 months, from October 30 to February 13, with an average daily incident shortwave energy per square meter below 4.1 kWh. The darkest month of the year in Hamadān is December, with an average of 3.0 kWh.

For the purposes of this report, the geographical coordinates of Hamadān are 34.799 deg latitude, 48.515 deg longitude, and 5,971 ft elevation.

The topography within 2 miles of Hamadān contains significant variations in elevation, with a maximum elevation change of 571 feet and an average elevation above sea level of 5,978 feet. Within 10 miles contains significant variations in elevation (6,102 feet). Within 50 miles also contains extreme variations in elevation (7,244 feet).

The area within 2 miles of Hamadān is covered by artificial surfaces (94%), within 10 miles by shrubs (46%) and cropland (16%), and within 50 miles by shrubs (43%) and cropland (26%).