Climate and Average Weather Year Round in Tryavna Bulgaria

In Tryavna, the summers are warm and mostly clear and the winters are freezing, snowy, and partly cloudy. Over the course of the year, the temperature typically varies from 21°F to 81°F and is rarely below 9°F or above 90°F.

Based on the tourism score, the best time of year to visit Tryavna for warm-weather activities is from mid June to early September.

The warm season lasts for 3.6 months, from May 28 to September 15, with an average daily high temperature above 72°F. The hottest month of the year in Tryavna is July, with an average high of 80°F and low of 56°F.

The cold season lasts for 3.4 months, from November 23 to March 3, with an average daily high temperature below 44°F. The coldest month of the year in Tryavna is January, with an average low of 21°F and high of 35°F.

In Tryavna, 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 Tryavna begins around June 9 and lasts for 3.5 months, ending around September 24.

The clearest month of the year in Tryavna is July, during which on average the sky is clear, mostly clear, or partly cloudy 87% of the time.

The cloudier part of the year begins around September 24 and lasts for 8.5 months, ending around June 9.

The cloudiest month of the year in Tryavna is December, during which on average the sky is overcast or mostly cloudy 54% 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 Tryavna varies throughout the year.

The wetter season lasts 2.9 months, from April 17 to July 15, with a greater than 24% chance of a given day being a wet day. The month with the most wet days in Tryavna is June, with an average of 9.3 days with at least 0.04 inches of precipitation.

The drier season lasts 9.1 months, from July 15 to April 17. The month with the fewest wet days in Tryavna is January, with an average of 4.6 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. Based on this categorization, the most common form of precipitation in Tryavna changes throughout the year.

Rain alone is the most common for 10 months, from February 13 to December 15. The month with the most days of rain alone in Tryavna is June, with an average of 9.3 days.

Snow alone is the most common for 2.0 months, from December 15 to February 13. The month with the most days of snow alone in Tryavna is January, with an average of 2.6 days.

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. Tryavna experiences some seasonal variation in monthly rainfall.

The rainy period of the year lasts for 10 months, from February 11 to December 24, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain in Tryavna is June, with an average rainfall of 2.3 inches.

The rainless period of the year lasts for 1.6 months, from December 24 to February 11. The month with the least rain in Tryavna is January, with an average rainfall of 0.3 inches.

Snowfall

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

The snowy period of the year lasts for 5.6 months, from October 21 to April 10, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow in Tryavna is January, with an average snowfall of 7.2 inches.

The snowless period of the year lasts for 6.4 months, from April 10 to October 21. The least snow falls around July 17, with an average total accumulation of 0.0 inches.

The length of the day in Tryavna varies significantly over the course of the year. In 2024, the shortest day is December 21, with 9 hours, 1 minute of daylight; the longest day is June 20, with 15 hours, 21 minutes of daylight.

The earliest sunrise is at 5:38 AM on June 15, and the latest sunrise is 2 hours, 10 minutes later at 7:48 AM on January 4. The earliest sunset is at 4:43 PM on December 8, and the latest sunset is 4 hours, 17 minutes later at 9:00 PM on June 26.

Daylight saving time (DST) is observed in Tryavna during 2024, starting in the spring on March 31, lasting 6.9 months, and ending in the fall on October 27.

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 Tryavna, 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 3% of 3% 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 Tryavna experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 5.2 months, from November 17 to April 22, with average wind speeds of more than 6.4 miles per hour. The windiest month of the year in Tryavna is February, with an average hourly wind speed of 7.2 miles per hour.

The calmer time of year lasts for 6.8 months, from April 22 to November 17. The calmest month of the year in Tryavna is August, with an average hourly wind speed of 5.6 miles per hour.

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

The wind is most often from the south for 1.7 months, from March 27 to May 18 and for 1.5 months, from October 3 to November 18, with a peak percentage of 33% on November 13. The wind is most often from the north for 4.5 months, from May 18 to October 3, with a peak percentage of 42% on July 17. The wind is most often from the west for 4.3 months, from November 18 to March 27, with a peak percentage of 42% on January 1.

To characterize how pleasant the weather is in Tryavna 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 Tryavna for general outdoor tourist activities is from mid June to early September, with a peak score in the last week of July.

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 Tryavna for hot-weather activities is from early July to mid August, with a peak score in the last 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 Tryavna typically lasts for 6.1 months (185 days), from around April 16 to around October 18, rarely starting before March 28 or after May 5, and rarely ending before September 30 or after November 4.

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 Tryavna should appear around April 16, only rarely appearing before April 2 or after May 3.

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 14 to August 22, with an average daily incident shortwave energy per square meter above 6.2 kWh. The brightest month of the year in Tryavna is July, with an average of 7.2 kWh.

The darker period of the year lasts for 3.5 months, from October 29 to February 14, with an average daily incident shortwave energy per square meter below 2.8 kWh. The darkest month of the year in Tryavna is December, with an average of 1.6 kWh.

For the purposes of this report, the geographical coordinates of Tryavna are 42.867 deg latitude, 25.500 deg longitude, and 1,601 ft elevation.

The topography within 2 miles of Tryavna contains very significant variations in elevation, with a maximum elevation change of 1,119 feet and an average elevation above sea level of 1,816 feet. Within 10 miles contains very significant variations in elevation (4,324 feet). Within 50 miles also contains extreme variations in elevation (7,749 feet).

The area within 2 miles of Tryavna is covered by trees (54%), cropland (28%), and artificial surfaces (16%), within 10 miles by trees (67%) and cropland (22%), and within 50 miles by cropland (46%) and trees (41%).