Statistical analysis of urban regional pre-monsoon rainfall in and around Kolkata, India

  • Sweta ChakrabortyEmail author
  • Biswajit Roy Chowdhury
  • Sarbari Ghosh
  • P K Sen
  • U K De


The present study aims at statistical analysis of pre-monsoon rainfall at Kolkata, India over a span of 45 yr (1970–2014) with special emphasis on the effect of urbanisation on pre-monsoon rainfall at Alipore, a core area of Kolkata (\(22{^{\circ }}34^{\prime }\hbox {N}\); \(88{^{\circ }}24^{\prime }\hbox {E}\)) India, where the urbanisation is almost static during the period 1970–2014 and Dumdum (\(22{^{\circ }}65^{\prime }\hbox {N}\); \(88{^{\circ }}45^{\prime }\hbox {E}\)), the outer periphery of Kolkata, where the urbanisation is still an ongoing process. As pre-monsoon rainfall is an effect of mesoscale convective development (horizontal dimensions 5–500 km), the two stations namely Dumdum and Alipore which are nearly 22 km apart from each other are taken into consideration in this study. To determine the possible changes in the pre-monsoon rainfall in both stations, a non-parametric Wilcoxon Signed Rank Sum test is conducted. This test reveals that the annual average pre-monsoon rainfall increased at Dumdum in post-urbanisation period, i.e., 1991–2014 compared to Alipore during the same period. It is important to note that the result of statistical analysis almost tallies with that of the geographical one.


Urbanisation pre-monsoon rainfall Wilcoxon Signed Rank Sum test land-use change rainfall trends 



The authors are grateful to the Regional Meteorological Centre, India Meteorological Department, Alipore for the supply of necessary rainfall data. The authors are also indebted to the National Atlas and Thematic Mapping Organization, Survey of India, Government of India for providing the satellite data. The authors also acknowledge Computer Aided Centre, Jadavpur University, Kolkata 700032, India, for assistance.


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Copyright information

© Indian Academy of Sciences 2019

Authors and Affiliations

  • Sweta Chakraborty
    • 1
    • 2
    • 3
    Email author
  • Biswajit Roy Chowdhury
    • 4
  • Sarbari Ghosh
    • 1
    • 3
    • 5
  • P K Sen
    • 6
  • U K De
    • 3
  1. 1.Department of Atmospheric SciencesUniversity of CalcuttaKolkataIndia
  2. 2.Jagadis Bose National Science Talent SearchKolkataIndia
  3. 3.Centre for Interdisciplinary Research and EducationKolkataIndia
  4. 4.Department of GeographyVidyasagar CollegeKolkataIndia
  5. 5.Department of MathematicsVidyasagar Evening CollegeKolkataIndia
  6. 6.Department of MathematicsJadavpur UniversityKolkataIndia

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