Last updated: January 18, 2025
The climate of Sylhet, Bangladesh, is characterized by distinct Köppen-Geiger classes, primarily featuring tropical monsoon (Am) and humid subtropical (Cwa) climates. Temperature fluctuations are notable throughout the year, with January experiencing a minimum of 6°C (44°F) and a crisp winter ambiance, while April heats up significantly, reaching maximum temperatures of 39°C (103°F). On average, the region maintains a balmy temperature of 25°C (77°F), contributing to its lush landscapes and diverse ecosystems. This climatic diversity not only shapes the local environment but also influences agricultural practices and community lifestyles in the region.
Sylhet, Bangladesh, exhibits distinct seasonal temperature patterns throughout the year. The winter months of January and February start off relatively cool, with minimum temperatures rising from 6°C (44°F) in January to 9°C (49°F) in February, while average temperatures gradually increase from 18°C (64°F) to 20°C (68°F). As spring approaches in March and April, temperatures escalate significantly, peaking in April with maximums reaching 39°C (103°F). The hot, humid conditions persist through late spring and the summer months of May, June, and July, where temperatures average between 27°C (81°F) and 29°C (84°F). Following this peak, the region experiences a slight cooling trend from August to October, with average temperatures stabilizing around 29°C (85°F) before dipping further in November to 23°C (74°F). The year concludes with December, bringing cooler weather once again as temperatures drop to a minimum of 10°C (50°F), showcasing the region's dynamic and varied climatic experience.
Sylhet experiences a significant temperature range throughout the year, with January temperatures dipping to a minimum of 6°C (44°F) and reaching a maximum of 37°C (99°F) in August. For more detailed information on the monthly temperatures in Sylhet, you can visit monthly temperatures in Sylhet.
Precipitation patterns in Sylhet, Bangladesh, showcase a striking seasonal variability that reflects the region's tropical monsoon climate. The year begins with minimal rainfall, as January records only 6 mm (0.2 in) over just one day, gradually increasing to 20 mm (0.8 in) in February. However, the onset of spring in March marks a significant change, with March alone receiving 105 mm (4.1 in) over nine days. As the region transitions into the monsoon season, April sees a dramatic surge in rainfall, totaling 396 mm (15.6 in), followed by May with an even higher accumulation of 435 mm (17.1 in).
The monsoon peaks in June and July, where precipitation reaches astonishing levels of 583 mm (22.9 in) and 585 mm (23.0 in) respectively, with nearly every day experiencing rain. Subsequently, the intensity of rainfall begins to taper, with August and September still recording substantial precipitation of 487 mm (19.2 in) and 362 mm (14.2 in) respectively. By October, the rainfall declines to 229 mm (9.0 in), and the year concludes with much drier conditions in November and December, with only 20 mm (0.8 in) and 51 mm (2.0 in) respectively. This pronounced fluctuation in precipitation reinforces the region's rich biodiversity and agricultural dependency on the monsoonal rains.
In Sylhet, Bangladesh, sunshine duration exhibits a notable seasonal trend characterized by an initial rise from winter into spring, followed by a gradual decrease during the summer months. January kicks off the year with a solid 243 hours of sunlight, which steadily climbs to 286 hours in February and peaks in March with an impressive 330 hours. This peak in sunshine is pivotal as it signals the transition into the warmer months. Although April sees a slight decline to 306 hours, May maintains a robust 313 hours, offering lush conditions for agriculture and a vibrant natural landscape.
As the region enters the monsoon season in June, the sunshine hours begin to taper, reflecting the increased cloud cover and rainfall. June records 261 hours, which continues to decline through July at 251 hours and August at 271 hours. The intermittent rains moderate the intensity of summer heat but limit the sunlight significantly. However, as the monsoon season recedes, the sunshine duration improves again in September (274 hours) and rebounds further in October with 300 hours. November and December show a return to longer daylight hours, averaging 291 and 290 hours respectively, suggesting a balanced climate that allows both wet and dry periods to coexist harmoniously in Sylhet.
The UV Index in Sylhet, Bangladesh, illustrates a marked seasonal variation, with fluctuations ranging from high to extreme levels throughout the year. In the winter months of January and February, the UV Index registers a moderate 6 and 7 respectively, indicating a high exposure category and a recommended burn time of 25 minutes for unprotected skin. As the spring approaches, the Index escalates dramatically, peaking in March at 9 (very high) and soaring to 10 in April. The transition into summer sees the UV Index reach extreme levels, with May witnessing a peak at 13, which persists throughout June and July, demanding a significantly reduced burn time of just 10 minutes.
During the monsoon season, the UV Index remains consistently high, fluctuating between 13 and 14 until August, after which it slightly decreases. October brings a return to very high levels with an Index of 10, while November's Index settles at 8 as the year draws to a close. By December, the UV Index returns to high levels with a reading of 6, paralleling the conditions at the beginning of the year. This cyclical pattern underscores the importance of sun protection during the hotter months when solar radiation is at its most intense, highlighting the critical need for awareness and safety measures in managing UV exposure throughout the seasons.
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Daylight duration in Sylhet, Bangladesh, varies significantly throughout the year, following a consistent pattern that reflects the changing seasons. In January, the region experiences approximately 10 hours of daylight, which increases steadily to 11 hours in February. This trend continues into the spring months, reaching 12 hours of daylight by March and maintaining that length into April. As May ushers in the summer, daylight extends to 13 hours, offering ample time for outdoor activities and agricultural practices while maximizing the benefits of sunlight.
The long summer days are a highlight, with June, July, and August each providing 13 hours of daylight. However, as the monsoon season concludes and autumn approaches, daylight hours gradually taper off. September and October see a return to 12 and 11 hours of daylight respectively, while November and December each settle back down to 10 hours as the region transitions back to winter. This cyclical pattern underscores the balance of light and darkness in Sylhet, influencing both the daily rhythms of life and the agricultural calendar in this vibrant region.
Sylhet, Bangladesh, experiences a tropical monsoon climate characterized by distinct seasons. January to March sees mild temperatures ranging from 6°C to 34°C (44°F to 93°F), with relatively low precipitation. The monsoon season spans from April to September, during which temperatures peak at 37°C (99°F) and rainfall dramatically increases, especially in June and July with over 800 mm (31.5 inches) of rain. Sunshine hours vary, with March enjoying up to 333 hours, while the wettest months have less sunlight. For more detailed information, visit Sylhet climate.
In conclusion, Sylhet, Bangladesh, presents a dynamic climate characterized by distinct temperature variations, significant rainfall, and fluctuating sunlight and UV exposure throughout the year. The region experiences a warm tropical monsoon climate with seasonal patterns that influence not only the environment but also local agriculture and daily life. From the cool, dry months of winter to the intense heat and humidity of summer, the interplay of temperature, precipitation, and daylight duration creates a rich tapestry that shapes the landscape and lifestyle of its inhabitants. Understanding these climatic nuances is essential for fostering sustainable practices and enhancing resilience against environmental changes, ensuring a harmonious coexistence with the region's vibrant ecosystems.