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. 2020 Sep 3;10:14576. doi: 10.1038/s41598-020-71312-3

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Distribution of the climate average and trend of CDHE days in the warm season during 1961–2018 ((a) average of all compound days for the period of 1961–2018; (b) trend of all CDHE days. Statistic significance is detected using Mann–Kendall non-parametric test and the linear trend is quantified using Theil-Sen trend estimation(Filled dots stand for the station with statistical significance at 90% confidence level)). Maps are generated using NCAR Command Language (The NCAR Command Language (Version 6.6.2) [Software]. (2019). Boulder, Colorado: UCAR/NCAR/CISL/TDD. https://www.ncl.ucar.edu/).