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. The satellite-based cloud climate data record CLARA-A2has been used to analyse regional average time-series and regional maps oftrends in the Baltic Sea region, 1982–2015. The investigated cloudparameters were total fractional cloud cover and cloud top height. Cloudobservations from the Tartu-Toravere meteorological station were used asreference data for the same period. Fractional cloud cover from CLARA-A2 wasin a good agreement with in situ data regarding the maxima and minima yearsand a downward trend in March over the 1982–2015 period. In June thefractional cloud cover interannual variability was very high and no cleartrend was seen. For cloud top heights summer and spring regional averagesshowed opposite signs of the trend: for June positive and for Marchnegative. Winter and autumn seasons have been left out of analysis due totoo large uncertainties in cloud products over latitudes higher than60 ∘ .

Changes in satellite-based cloud parameters in the Baltic Sea region during spring and summer (1982–2015)