Last updated: January 18, 2025
Barisāl, Bangladesh, exhibits a tropical monsoon climate (Aw, Am) characterized by distinct seasonal variations. Temperatures range from a minimum of 9°C (49°F) in January, highlighting the cooler winter months, to a scorching maximum of 39°C (102°F) in April, marking the peak of the pre-monsoon season. The annual average temperature settles at a warm 26°C (79°F), reflecting the region's humid conditions and significant rainfall during the monsoon. This climate diversity significantly influences local agriculture, water resources, and daily life, thereby shaping the socio-economic landscape of the region.
Temperature patterns in Barisāl, Bangladesh, reveal distinct seasonal trends throughout the year. January marks the coldest month, with nighttime lows dropping to 9°C (49°F) and average temperatures rising to 19°C (66°F), gradually warming into February. As the pre-monsoon season approaches, March and April witness a significant increase, with March averages reaching 26°C (80°F) and peaks of 39°C (102°F) in April, reflecting the intense heat before the rains arrive. The transition to the monsoon in May brings slightly cooler temperatures, with averages stabilizing around 29°C (85°F). This warmth persists through the summer months of June and July, while the peak high remains close to 37°C (98°F). By August and September, temperatures gradually ease, maintaining an average of 29°C (84°F) but often accompanied by high humidity. The cooler months return in October and November, with average temperatures dipping to 24°C (76°F) in November, before settling into December at a minimum of 11°C (52°F), closing the year with a hint of winter's chill.
Barishal experiences a significant temperature range throughout the year, with January's minimum dipping to 9°C (49°F) and April peaking at 38°C (101°F). This variation highlights the city's diverse climate, where residents can experience both cool winters and scorching summers. For more details on the monthly temperatures in Barishal, visit monthly temperatures in Barishal.
Precipitation in Barisāl, Bangladesh, exhibits pronounced seasonal variations, with minimal rainfall during the winter months and significant increases as the monsoon approaches. January and February are notably dry, receiving only 5 mm (0.2 in) and 6 mm (0.2 in) of rain respectively, often characterized by clear skies and low humidity. This changes dramatically in March, where a surge to 34 mm (1.3 in) signals the onset of spring, quickly escalating to 107 mm (4.2 in) in April as pre-monsoon showers commence. May marks the transition into the monsoon season, amassing 169 mm (6.6 in), which leads into an extremely wet June, recording 411 mm (16.2 in) of rain over an average of 26 rainy days.
The monsoon continues through July and August, with precipitation levels averaging 373 mm (14.7 in) and 306 mm (12.1 in), respectively, as rainfall events peak. September witnesses a decrease to 269 mm (10.6 in), although substantial, followed by a tapering off in October at 209 mm (8.2 in). As the year closes, November and December see further declines, with 66 mm (2.6 in) and 32 mm (1.3 in) respectively. Overall, this pattern illustrates a clear distinction between dry and wet seasons, a characteristic that profoundly impacts local agriculture, water supply, and daily life in Barisāl.
In Barisāl, Bangladesh, sunshine duration exhibits a clear seasonal trend, characterized by a steady increase from winter to summer. January starts the year with 244 hours of sunshine, gradually climbing as the region transitions into spring. February experiences 286 hours, and this upward momentum continues into March and April, where hours peak at 329 and 328, respectively. May emerges as the sunniest month, boasting 338 hours, providing an abundance of daylight in preparation for the forthcoming monsoon season. This period not only fuels agricultural activities but also enhances outdoor livelihoods, a vital aspect of the local economy.
As the monsoon takes hold in June, sunshine hours drop to 267, reflecting the arrival of clouds and rain. However, conditions improve slightly in July and August, with 280 and 290 hours of sunshine, respectively, allowing for some respite amidst the rain. By September, sunshine duration slightly decreases again to 279 hours, followed by a resurgence in October at 295 hours and a stable pattern through to November with 288 hours. Although December sees a decline to 281 hours, the overall trend highlights the region's substantial seasonal shifts in sunlight, which play a crucial role in shaping the climate and agricultural cycles throughout the year.
The UV Index in Barisāl, Bangladesh, reveals significant seasonal variations that highlight the region's exposure to ultraviolet radiation throughout the year. In January, the UV Index stands at 6, classified as high, with a burn time of 25 minutes for unprotected skin. As the year progresses, February sees a notable increase to 8, entering the very high exposure category and reducing the safe burn time to 15 minutes. March and April maintain a high UV Index of 10, emphasizing the critical need for sun protection during these months. The peak occurs in May, with the UV Index soaring to 13, categorized as extreme, necessitating vigilant sun safety measures due to a dramatically reduced burn time of just 10 minutes.
The extreme UV levels persist through the monsoon months of June, July, and August, hitting a maximum of 14 during July and August—forcing residents to be particularly cautious. Despite continued cloud cover during the rainy season, the intensity of UV radiation remains high. As September transitions to cooler months, the UV Index drops slightly to 13, while October sees a further decrease to 11. The exposure level continues to decline through November, returning to 8, before reverting to 6 in December. These fluctuations highlight the importance of adapting sun protection strategies throughout the year, particularly during the intense summer months when UV exposure peaks.
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Daylight duration in Barisāl, Bangladesh, showcases a predictable seasonal pattern, reflecting the region's geographical position. In January, daylight lasts for 10 hours, gradually increasing through February to 11 hours as the country transitions into spring. March marks a significant enhancement, providing 12 hours of daylight, a trend that holds steady into April. The month of May, heralding the onset of summer, enjoys the longest daylight hours of the year at 13 hours, which continues through June and July, offering ample time for outdoor activities and agricultural work.
As summer progresses into the monsoon season, daylight duration begins to taper off, reducing to 12 hours in August and maintaining that length through September. The daylight hours then decrease further in October and November, both offering 11 hours of light as the region transitions into winter. By December, the cycle completes as daylight returns to 10 hours, mirroring the conditions observed at the start of the year. This rhythmic fluctuation in daylight duration is vital for local ecosystems, agriculture, and daily life, serving as a natural calendar that influences various aspects of life in Barisāl.
Barishal, Bangladesh experiences a tropical climate with significant temperature variation throughout the year. January sees cooler temperatures ranging from 9°C to 30°C, while summer months like April and May peak at around 38°C. Rainfall dramatically increases from March, reaching a maximum of 405 mm in June, which marks the monsoon season. The city enjoys abundant sunshine, particularly in March and May, with over 330 hours per month. For more detailed information, visit Barishal climate.
In conclusion, the climate of Barisāl, Bangladesh, characterized by distinct seasonal variations in temperature, precipitation, sunshine duration, UV Index, and daylight hours, significantly influences the region's agricultural practices, water resources, and overall lifestyle. The warm temperatures and abundant rainfall during the monsoon season create a vibrant environment conducive to farming, while the variations in sunshine and UV exposure highlight the importance of effective sun protection. Understanding these climatic patterns not only informs local residents and policymakers but also enriches our broader comprehension of how climate dynamics impact human activity and ecological systems in tropical regions. Such insights are crucial for developing adaptive strategies that enhance resilience to climate-related challenges and promote sustainable development in Barisāl and similar locales.