Climate and Average Weather Year Round in Stara Zagora Bulgaria
In Stara Zagora, the summers are warm and mostly clear and the winters are very cold and partly cloudy. Over the course of the year, the temperature typically varies from 26°F to 87°F and is rarely below 15°F or above 95°F.
Based on the beach/pool score, the best time of year to visit Stara Zagora for hot-weather activities is from early July to late August.
Climate in Stara Zagora
Average Temperature in Stara Zagora
The hot season lasts for 3.4 months, from June 1 to September 15, with an average daily high temperature above 77°F. The hottest day of the year is August 1, with an average high of 87°F and low of 61°F.
The cold season lasts for 3.4 months, from November 23 to March 5, with an average daily high temperature below 49°F. The coldest day of the year is January 19, with an average low of 26°F and high of 40°F.
Average High and Low Temperature in Stara Zagora
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 in Stara Zagora
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
In Stara Zagora, 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 Stara Zagora begins around June 9 and lasts for 3.6 months, ending around September 26. On July 25, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 90% of the time, and overcast or mostly cloudy 10% of the time.
The cloudier part of the year begins around September 26 and lasts for 8.4 months, ending around June 9. On December 2, the cloudiest day of the year, the sky is overcast or mostly cloudy 54% of the time, and clear, mostly clear, or partly cloudy 46% of the time.
Cloud Cover Categories in Stara Zagora
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Stara Zagora varies throughout the year.
The wetter season lasts 2.6 months, from April 19 to July 7, with a greater than 22% chance of a given day being a wet day. The chance of a wet day peaks at 32% on June 3.
The drier season lasts 9.4 months, from July 7 to April 19. The smallest chance of a wet day is 13% on November 2.
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 32% on June 3.
Daily Chance of Precipitation in Stara Zagora
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. Stara Zagora experiences some seasonal variation in monthly rainfall.
Rain falls throughout the year in Stara Zagora. The most rain falls during the 31 days centered around June 14, with an average total accumulation of 2.1 inches.
The least rain falls around January 23, with an average total accumulation of 0.9 inches.
Average Monthly Rainfall in Stara Zagora
We report snowfall in liquid-equivalent terms. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. Colder, drier snow tends to be on the higher end of that range and warmer, wetter snow on the lower end.
As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Stara Zagora experiences some seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 3.5 months, from November 26 to March 11, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around January 1, with an average total liquid-equivalent accumulation of 0.4 inches.
The snowless period of the year lasts for 8.5 months, from March 11 to November 26. The least snow falls around July 19, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall in Stara Zagora
The length of the day in Stara Zagora varies significantly over the course of the year. In 2021, the shortest day is December 21, with 9 hours, 4 minutes of daylight; the longest day is June 21, with 15 hours, 18 minutes of daylight.
Hours of Daylight and Twilight in Stara Zagora
The earliest sunrise is at 5:39 AM on June 15, and the latest sunrise is 2 hours, 9 minutes later at 7:48 AM on October 30. The earliest sunset is at 4:44 PM on December 8, and the latest sunset is 4 hours, 14 minutes later at 8:58 PM on June 27.
Daylight saving time (DST) is observed in Stara Zagora during 2021, starting in the spring on March 28, lasting 7.1 months, and ending in the fall on October 31.
Sunrise & Sunset with Twilight and Daylight Saving Time in Stara Zagora
The figure below presents a compact representation of key lunar data for 2021. 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.
Moon Rise, Set & Phases in Stara Zagora
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 Stara Zagora, 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 4% of 4% throughout.
Humidity Comfort Levels in Stara Zagora
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
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 Stara Zagora experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 4.1 months, from December 12 to April 16, with average wind speeds of more than 6.5 miles per hour. The windiest day of the year is February 11, with an average hourly wind speed of 7.2 miles per hour.
The calmer time of year lasts for 7.9 months, from April 16 to December 12. The calmest day of the year is June 1, with an average hourly wind speed of 5.7 miles per hour.
Average Wind Speed in Stara Zagora
The predominant average hourly wind direction in Stara Zagora is from the north throughout the year.
Wind Direction in Stara Zagora
Best Time of Year to Visit
To characterize how pleasant the weather is in Stara Zagora 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 Stara Zagora for general outdoor tourist activities is from early June to late September, with a peak score in the first week of September.
Tourism Score in Stara Zagora
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 Stara Zagora for hot-weather activities is from early July to late August, with a peak score in the last week of July.
Beach/Pool Score in Stara Zagora
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 Stara Zagora typically lasts for 6.9 months (211 days), from around April 4 to around November 2, rarely starting before March 16 or after April 27, and rarely ending before October 14 or after November 20.
Time Spent in Various Temperature Bands and the Growing Season in Stara Zagora
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
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 Stara Zagora should appear around April 3, only rarely appearing before March 20 or after April 21.
Growing Degree Days in Stara Zagora
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 15 to August 23, with an average daily incident shortwave energy per square meter above 6.3 kWh. The brightest day of the year is July 8, with an average of 7.5 kWh.
The darker period of the year lasts for 3.5 months, from October 30 to February 14, with an average daily incident shortwave energy per square meter below 2.8 kWh. The darkest day of the year is December 21, with an average of 1.6 kWh.
Average Daily Incident Shortwave Solar Energy in Stara Zagora
For the purposes of this report, the geographical coordinates of Stara Zagora are 42.433 deg latitude, 25.642 deg longitude, and 673 ft elevation.
The topography within 2 miles of Stara Zagora contains very significant variations in elevation, with a maximum elevation change of 889 feet and an average elevation above sea level of 774 feet. Within 10 miles contains very significant variations in elevation (2,539 feet). Within 50 miles contains large variations in elevation (7,694 feet).
The area within 2 miles of Stara Zagora is covered by artificial surfaces (56%) and cropland (37%), within 10 miles by cropland (47%) and trees (37%), and within 50 miles by cropland (48%) and trees (38%).
This report illustrates the typical weather in Stara Zagora, 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 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Stara Zagora.
For each station, the records are corrected for the elevation difference between that station and Stara Zagora 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 Stara Zagora is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Stara Zagora and a given station.
The stations contributing to this reconstruction are: Bezmer Air Base (LBIA, 34%, 58 kilometers, east); Graf Ignatievo (LBPG, 23%, 77 kilometers, west); Plovdiv Airport (LBPD, 23%, 77 kilometers, southwest); and Gorna Orechovista (LBGO, 21%, 80 kilometers, north).
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , 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 airports 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.
The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.
We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.
We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.