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Trends at stations

The annual and seasonal climate trends are visualised for the stations of the Swiss climatological network. The graphic charts show how the temperature and precipitation have changed for different periods. The illustration of trends at the stations also allows us to make conclusions about different regional and seasonal developments.


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Changes in temperature and precipitation can be illustrated for the 29 stations of the Swiss national basic climatological network (Swiss NBCN) for 14 different periods. The precipitation trend can additionally be shown for 46 stations with long-term precipitation series.

The method of least squares is used for the trend calculation of the temperature, and the Theil-Sen equation for the precipitation. The levels of significance were estimated with the non-parametric test according to Mann-Kendall.


  • Kendall M.G., 1975: Rank Correlation Methods, Charles Griffin, London.
  • Mann H.B., 1945: Nonparametric tests against trend. Econometrika 13:245-259.
  • Sen P.K., 1968: Estimates of the regression coefficient based on Kendall's tau. Journal of the American Statistical Association, 63, 1379-1389.
  • Theil H., 1950: A rank-invariant method of linear and polynomial regression analysis. Netherlands Akad. Wetensch. Proc., 53, pages: 386-392 (part I), 521-525 (part II), 1397-1412 (part III).