Average Weather in Siirt Turkey

In Siirt, the summers are hot, arid, and clear and the winters are long, chilly, and partly cloudy. Over the course of the year, the temperature typically varies from 29°F to 98°F and is rarely below 18°F or above 103°F.

The hot season lasts for 3.2 months, from June 10 to September 17, with an average daily high temperature above 87°F. The hottest day of the year is July 26, with an average high of 98°F and low of 68°F.

The cold season lasts for 3.7 months, from November 23 to March 15, with an average daily high temperature below 54°F. The coldest day of the year is January 23, with an average low of 29°F and high of 43°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.

Average Hourly Temperature

The average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < chilly < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The shaded overlays indicate night and civil twilight.

Clouds

In Siirt, 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 Siirt begins around May 20 and lasts for 4.6 months, ending around October 9. On July 15, 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 9 and lasts for 7.4 months, ending around May 20. On February 27, the cloudiest day of the year, the sky is overcast or mostly cloudy 48% of the time, and clear, mostly clear, or partly cloudy 52% of the time.

Cloud Cover

The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.

Precipitation

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

The wetter season lasts 7.1 months, from October 18 to May 20, with a greater than 14% chance of a given day being a wet day. The chance of a wet day peaks at 27% on March 19.

The drier season lasts 4.9 months, from May 20 to October 18. The smallest chance of a wet day is 1% on July 14.

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 26% on March 19.

Daily Chance of Precipitation

The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

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. Siirt experiences significant seasonal variation in monthly rainfall.

The rainy period of the year lasts for 8.0 months, from October 1 to June 1, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around March 26, with an average total accumulation of 2.2 inches.

The rainless period of the year lasts for 4.0 months, from June 1 to October 1. The least rain falls around August 20, with an average total accumulation of 0.0 inches.

Average Monthly Rainfall

The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average liquid-equivalent snowfall.

Snowfall

The sliding 31-day liquid-equivalent quantity of snowfall in Siirt does not vary significantly over the course of the year, staying within 0.1 inches of 0.1 inches throughout.

Average Liquid-Equivalent Monthly Snowfall

The average liquid-equivalent snowfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average rainfall.

Sun

The length of the day in Siirt varies significantly over the course of the year. In 2017, the shortest day is December 21, with 9 hours, 32 minutes of daylight; the longest day is June 21, with 14 hours, 48 minutes of daylight.

Hours of Daylight and Twilight

The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise is at 4:49 AM on June 13, and the latest sunrise is 2 hours, 39 minutes later at 7:28 AM on January 5. The earliest sunset is at 4:52 PM on December 6, and the latest sunset is 2 hours, 46 minutes later at 7:38 PM on June 28.

Daylight saving time (DST) is not observed in Siirt during 2017.

Sunrise & Sunset with Twilight

The solar day over the course of the year 2017. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.

Humidity

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 Siirt, 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, staying within 1% of 1% throughout.

Humidity Comfort Levels

The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.

Wind

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 Siirt does not vary significantly over the course of the year, remaining within 0.3 miles per hour of 3.0 miles per hour throughout.

Average Wind Speed

The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

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

The wind is most often from the south for 3.7 months, from February 23 to June 15 and for 2.8 months, from June 25 to September 18, with a peak percentage of 42% on April 17. The wind is most often from the west for 1.4 weeks, from June 15 to June 25, with a peak percentage of 28% on June 17. The wind is most often from the east for 5.2 months, from September 18 to February 23, with a peak percentage of 51% on January 1.

Wind Direction

The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Solar Energy

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 3.2 months, from May 19 to August 25, with an average daily incident shortwave energy per square meter above 7.4 kWh. The brightest day of the year is July 4, with an average of 8.7 kWh.

The darker period of the year lasts for 3.6 months, from October 30 to February 17, with an average daily incident shortwave energy per square meter below 3.6 kWh. The darkest day of the year is December 23, with an average of 2.3 kWh.

Average Daily Incident Shortwave Solar Energy

The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

For the purposes of this report, the geographical coordinates of Siirt are 37.929 deg latitude, 41.941 deg longitude, and 2,890 ft elevation.

The topography within 2 miles of Siirt contains very significant variations in elevation, with a maximum elevation change of 1,010 feet and an average elevation above sea level of 2,976 feet. Within 10 miles contains very significant variations in elevation (4,157 feet). Within 50 miles also contains extreme variations in elevation (10,121 feet).

The area within 2 miles of Siirt is covered by cropland (74%), within 10 miles by sparse vegetation (37%) and grassland (24%), and within 50 miles by sparse vegetation (32%) and trees (28%).

Data Sources

This report illustrates the typical weather in Siirt, 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

There are 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Siirt.

For each station, the records are corrected for the elevation difference between that station and Siirt according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

The estimated value at Siirt is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Siirt and a given station.

The stations contributing to this reconstruction are: Batman Airport (67%, 72 kilometers, west) and Kamishli (33%, 121 kilometers, southwest).

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.