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U. . Senatilleke, M. Gunathilake, Y. . Alyousifi, and U. Rathnayake, “Analysis of recent trends and variability of temperature and relative humidity over Sri Lanka”, MAUSAM, vol. 73, no. 3, pp. 511–524, Jul. 2022,

Analysis of recent trends and variability of temperature and relative humidity over Sri Lanka

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Author: Senatilleke, Udara1; Gunathilake, Miyuru B.2,3; Alyousifi, Yousif4;
Organizations: 1Department of Civil Engineering, Faculty of Engineering, Sri Lanka Institute of Information Technology, Malabe, Sri Lanka
2Hydrology and Aquatic Environment, Environment and Natural Resources, Norwegian Institute of Bioeconomy and Research, Ås, Norway
3Water, Energy and Environmental Engineering Research Unit, Faculty of Technology, University of Oulu, Finland
4Department of Mathematical Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 0.5 MB)
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Language: English
Published: India Meteorological Department, 2022
Publish Date: 2023-07-04


The world is experiencing adverse consequences of climate change and shifts in climate regimes. Hence, studying the trends and patterns of meteorological variables is of major importance for many parties, including meteorologists, climatologists, agriculturists, and hydrologists. Although several researchers have examined the trends and patterns in historical rainfall, only a few have examined the trends in atmospheric temperature. Noteworthy none of the previous studies have attempted to investigate trends in relative humidity over Sri Lanka. Therefore, identifying the existing research gap, this paper presents trends and variability analysis of atmospheric temperature and relative humidity of Sri Lanka. The long-term variations of minimum and maximum temperature and relative humidity records at 18 stations distributed in the three climatic zones namely, the dry zone, the intermediate zone, and the wet zone in Sri Lanka were investigated for 30 years from 1990 to 2019. Annual and monthly trends were assessed using non-parametric statistical tests, including the Mann Kendall test (MK), Sen’s slope, and Spearman’s rho test, while the changing points of temperature and humidity were determined using the Pettit test. In addition, the variability of climate parameters was estimated using the Coefficient of Variation (CoV). Interesting and encouraging results were obtained from the present analysis. Badulla in the intermediate climatic zone was identified with unexpected decreasing temperature trends, while several other areas were identified with expected increasing temperature and relative humidity trends. The adaptation practices based on these results would be interesting to incorporate in achieving sustainable development goals for the country.

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Series: Mausam
ISSN: 0252-9416
ISSN-L: 0252-9416
Volume: 73
Issue: 3
Pages: 511 - 524
DOI: 10.54302/mausam.v73i3.3184
Type of Publication: A1 Journal article – refereed
Field of Science: 1181 Ecology, evolutionary biology
1171 Geosciences
Funding: The authors gratefully acknowledge the Sri Lanka Institute of Information Technology for the given financial support and for the environment provided to conduct this research work.
Copyright information: © 2022 MAUSAM. This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.