Climate and Average Weather Year Round in Sarvestān Iran

In Sarvestān, the summers are long, sweltering, arid, and clear and the winters are cold and mostly clear. Over the course of the year, the temperature typically varies from 32°F to 99°F and is rarely below 25°F or above 104°F.

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

The hot season lasts for 3.9 months, from May 21 to September 18, with an average daily high temperature above 90°F. The hottest month of the year in Sarvestān is July, with an average high of 99°F and low of 70°F.

The cold season lasts for 3.3 months, from November 26 to March 4, with an average daily high temperature below 63°F. The coldest month of the year in Sarvestān is January, with an average low of 32°F and high of 55°F.

In Sarvestān, 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 Sarvestān begins around May 16 and lasts for 5.3 months, ending around October 25.

The clearest month of the year in Sarvestān is June, during which on average the sky is clear, mostly clear, or partly cloudy 95% of the time.

The cloudier part of the year begins around October 25 and lasts for 6.7 months, ending around May 16.

The cloudiest month of the year in Sarvestān is April, during which on average the sky is overcast or mostly cloudy 33% 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 Sarvestān varies throughout the year.

The wetter season lasts 5.0 months, from November 12 to April 12, with a greater than 7% chance of a given day being a wet day. The month with the most wet days in Sarvestān is January, with an average of 4.0 days with at least 0.04 inches of precipitation.

The drier season lasts 7.0 months, from April 12 to November 12. The month with the fewest wet days in Sarvestān is September, with an average of 0.1 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 Sarvestān is March, with an average of 3.7 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 13% on March 14.

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. Sarvestān experiences some seasonal variation in monthly rainfall.

The rainy period of the year lasts for 5.1 months, from November 9 to April 13, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain in Sarvestān is January, with an average rainfall of 1.4 inches.

The rainless period of the year lasts for 6.9 months, from April 13 to November 9. The month with the least rain in Sarvestān is September, with an average rainfall of 0.0 inches.

The length of the day in Sarvestān varies significantly over the course of the year. In 2024, the shortest day is December 21, with 10 hours, 16 minutes of daylight; the longest day is June 21, with 14 hours, 1 minute of daylight.

The earliest sunrise is at 4:57 AM on June 10, and the latest sunrise is 1 hour, 55 minutes later at 6:52 AM on January 12. The earliest sunset is at 4:58 PM on December 2, and the latest sunset is 2 hours, 2 minutes later at 7:00 PM on June 30.

Daylight saving time (DST) is not observed in Sarvestān 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 Sarvestān, 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 Sarvestān experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 7.3 months, from January 22 to September 1, with average wind speeds of more than 6.0 miles per hour. The windiest month of the year in Sarvestān is March, with an average hourly wind speed of 6.9 miles per hour.

The calmer time of year lasts for 4.6 months, from September 1 to January 22. The calmest month of the year in Sarvestān is November, with an average hourly wind speed of 5.2 miles per hour.

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

The wind is most often from the north for 2.9 months, from June 28 to September 26, with a peak percentage of 43% on August 19. The wind is most often from the west for 9.1 months, from September 26 to June 28, with a peak percentage of 40% on January 1.

To characterize how pleasant the weather is in Sarvestān 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 time of year to visit Sarvestān for general outdoor tourist activities is from mid September to late October, with a peak score in the first week of October.

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 Sarvestān for hot-weather activities is from late May to mid September, with a peak score in the second week of June.

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 Sarvestān typically lasts for 8.6 months (263 days), from around March 11 to around November 29, rarely starting before February 14 or after April 1, and rarely ending before November 6 or after December 22.

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 Sarvestān should appear around February 22, only rarely appearing before February 8 or after March 9.

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 significant seasonal variation over the course of the year.

The brighter period of the year lasts for 3.6 months, from May 5 to August 24, with an average daily incident shortwave energy per square meter above 7.8 kWh. The brightest month of the year in Sarvestān is June, with an average of 8.8 kWh.

The darker period of the year lasts for 3.0 months, from November 6 to February 7, with an average daily incident shortwave energy per square meter below 4.8 kWh. The darkest month of the year in Sarvestān is December, with an average of 3.9 kWh.

For the purposes of this report, the geographical coordinates of Sarvestān are 29.274 deg latitude, 53.220 deg longitude, and 5,059 ft elevation.

The topography within 2 miles of Sarvestān contains very significant variations in elevation, with a maximum elevation change of 1,640 feet and an average elevation above sea level of 5,181 feet. Within 10 miles contains very significant variations in elevation (4,216 feet). Within 50 miles also contains extreme variations in elevation (7,854 feet).

The area within 2 miles of Sarvestān is covered by shrubs (60%), sparse vegetation (16%), and cropland (14%), within 10 miles by shrubs (60%) and sparse vegetation (31%), and within 50 miles by shrubs (52%) and sparse vegetation (23%).