Last updated: January 18, 2025
Sliven, Bulgaria, exhibits a diverse climate characterized by the Köppen-Geiger classifications of Cfa and Cfb, indicating a temperate climate with both humid subtropical and oceanic influences. The region experiences a notable temperature range, with winter minima plunging to -18°C (0°F) in March, while summer highs can soar to 40°C (105°F) in August. The annual average temperature settles at a moderate 12°C (55°F), highlighting the significant seasonal variability that defines Sliven's weather patterns and contributes to its unique ecological and cultural landscape.
Temperature patterns in Sliven, Bulgaria, reveal distinct seasonal trends, characterized by a cold winter and a hot summer. The year begins with January averaging a chilly 1°C (34°F), following a gradual warming trend throughout the spring months, culminating in a mild 11°C (52°F) in April. As summer approaches, temperatures rise significantly, peaking in August with an average of 24°C (75°F) and maximums reaching a scorching 40°C (105°F). Early autumn continues this warm trend before temperatures begin to drop again in November, where the average temperature settles around 8°C (47°F). By winter's return in December, the cycle restarts with cooler temperatures, averaging around 4°C (39°F), encapsulating the dynamic climate and seasonal transitions that define Sliven.
In Nova Zagora, temperatures can drop to a minimum of -18°C (1°F) in March and soar to a maximum of 40°C (105°F) in August, as detailed in the monthly temperatures in Nova Zagora. Kotel experiences slightly milder conditions, with a January low of -16°C (3°F) and an August high of 36°C (98°F), as shown in the monthly temperatures in Kotel. Sliven's climate mirrors that of Nova Zagora, with March minimums reaching -17°C (1°F) and August maximums hitting 37°C (99°F), as noted in the monthly temperatures in Sliven.
Precipitation patterns in Sliven, Bulgaria, reveal a varied distribution across the months, with an average annual rainfall characterized by peaks during the warmer periods. The wettest months are typically June and May, with rainfall reaching 115 mm (4.5 in) and 71 mm (2.8 in), respectively. This increase in precipitation aligns with the transition into summer, contributing to lush landscapes and vibrant ecosystems. Notably, June experiences the highest number of rainy days, at 16, which signifies the arrival of summer storms and consistent moisture in the region.
As the summer progresses, rainfall declines significantly in August and September, dropping to a modest 26 mm (1.0 in) and 23 mm (0.9 in), highlighting a dry period that often persists into early autumn. The precipitation levels gradually rise again in October and December, with 68 mm (2.7 in) and 85 mm (3.4 in) respectively, as winter approaches. Throughout the year, the distribution of rainy days varies, with January averaging 8 days of rain and June peaking with 16 days, contributing to the region's diverse climatic tapestry and seasonal hydrology.
In Sliven, Bulgaria, sunshine duration demonstrates a compelling seasonal trend, characterized by a steady ascent from the cold, grey winter months into the vibrant summer. January sees a modest 169 hours of sunshine, gradually increasing through February to 230 hours. As spring unfolds, the region experiences a more substantial rise, with March receiving 284 hours and peaking in April at 343 hours. The transition into late spring and early summer marks a significant increase, reaching a high of 425 hours in July, the sunniest month of the year. This encourages outdoor activities and highlights the region's appeal during the summer season.
As summer wanes, sunshine hours begin to taper off, yet August still offers a generous 403 hours of sunlight. The initial days of autumn continue to deliver ample sunshine, with September boasting 342 hours before October sees a decrease to 282 hours. By November, the sunlight dwindles further to 219 hours, and December closes the year with just 202 hours of sunshine. This clear seasonal cycle not only shapes the daily lives and activities of inhabitants in Sliven but also underscores the interplay between temperature and light, reinforcing the allure of the warmer months for both residents and visitors alike.
In Sliven, Bulgaria, the UV Index varies significantly throughout the year, reflecting seasonal changes in sun exposure and potential risks associated with ultraviolet radiation. Starting the year, January presents a low UV Index of 2, allowing for safer outdoor activities with a burn time of 45 minutes. As winter gives way to spring, the UV exposure increases sharply, with February showing a moderate index of 4 and a reduced burn time of 30 minutes. By March, the index climbs to 6, indicating high UV exposure, necessitating greater caution during sun exposure. April and May herald a notable surge, with the UV Index reaching 8 and 9, respectively, both categorized as very high and demanding vigilant sun protection.
Summer months peak in UV intensity, particularly in June, where the UV Index hits 10, along with consistent values of 9 in July and August, reflecting a persistent need for protective measures as burn times sharply decrease to just 15 minutes. As autumn approaches, the UV Index begins to decline, recording 7 in September and 6 in October. By November, a moderate UV Index of 3 returns, allowing for a relatively safer outdoor experience, before dropping back to a low 2 in December. This cyclical variation underscores the importance of sun safety measures in Sliven, particularly during the warmer months when UV exposure can pose significant risks.
UV Risk Categories
In Sliven, Bulgaria, daylight duration exhibits a clear seasonal pattern, with hours of natural light steadily increasing from the depths of winter to the longer days of summer. January offers only 9 hours of daylight, which gradually extends to 10 hours in February and 11 hours in March, marking the onset of spring. By April, daylight reaches 13 hours, and this upward trend continues, peaking in June with a maximum of 15 hours. These extended summer days create ample opportunity for outdoor activities and community engagement, embodying the vibrant spirit of the season.
As summer fades, daylight hours begin to shorten, with a slight decrease to 14 hours in July and 13 hours in August. By September, daylight is reduced to 12 hours, indicating the advance of autumn. October experiences a drop to 10 hours, leading back into the shorter days of winter, as November and December both settle at 9 hours a day. This cyclical rhythm not only reflects the changes in Sliven's ecological landscape but also significantly influences the lifestyle and daily activities of its residents throughout the year.
Kermen, Bulgaria experiences a diverse climate with distinct seasonal variations. Winters can be quite cold, with January temperatures ranging from -12°C to 15°C, while summers are warm, peaking in July and August at average temperatures of around 25°C. Precipitation is highest in June (73 mm) and December (80 mm), while the sunniest months are July and August, offering over 400 hours of sunshine each. This combination of factors creates an environment conducive to diverse flora and fauna. For more detailed information, visit Kermen climate.
Kotel, Bulgaria experiences a diverse climate with distinct seasonal variations. Winters are cold, with January temperatures ranging from -16°C to 15°C and an average of 0°C, while summers are warm, particularly in July and August, with highs reaching up to 36°C. Precipitation is notable, especially in June with 140 mm of rainfall, although it decreases in the later summer months. The area enjoys considerable sunshine, peaking in July at 422 hours, providing a bright backdrop to the warm summer days. For more detailed information, refer to Kotel climate.
The climate in Nova Zagora, Bulgaria, features a range of temperatures throughout the year, with cold winters and warm summers. January averages around 2°C (36°F), while July sees highs of up to 39°C (103°F). Precipitation varies, peaking in December with 80 mm (3.1 in), and the sunniest months are June and July, boasting over 400 hours of sunshine. This diverse climate contributes to the region's unique seasonal character, making it an interesting area for visitors and residents alike. For more details, visit Nova Zagora climate.
Sliven, Bulgaria experiences a diverse climate characterized by distinct seasons. Winters are cold, with January averaging around 0°C (33°F) and temperatures dipping as low as -14°C (7°F). Summers are warm to hot, with July reaching an average of 22°C (72°F) and maximums of up to 36°C (97°F). Precipitation varies throughout the year, peaking in June at 150 mm (5.9 in), while sunshine is abundant in the summer months, with July averaging 425 hours of sunlight. For more detailed information, visit Sliven climate.
Tvarditsa, Bulgaria experiences a continental climate with cold winters and warm summers. January temperatures can drop to -13°C (8°F) and peak at 14°C (58°F), while July soars to a high of 36°C (98°F). Precipitation is notable in June, with 138 mm (5.4 in), and overall rainfall peaks in May at 85 mm (3.4 in). Sunshine hours increase throughout the year, reaching a maximum of 426 hours in July. For more detailed information, visit Tvarditsa climate.
In conclusion, the climate of Sliven, Bulgaria, encapsulates a rich tapestry of seasonal variations in temperature, precipitation, sunshine, UV index, and daylight duration. Each season brings its own distinct characteristics, from the cold and short days of winter to the sunny and prolonged daylight of summer, impacting both the environment and lifestyle of the local population. Understanding these climatic patterns is crucial not only for residents but also for visitors seeking to experience the region's diverse natural beauty and cultural offerings throughout the year. By appreciating Sliven's unique climatic traits, individuals can make informed choices about activities, sun safety, and outdoor pursuits, ultimately enhancing their experience in this captivating part of Bulgaria.