Geographia Polonica (2000) vol. 73, iss. 2
Variability in the cloud cover of the Karkonosze Mountains over the last century
Geographia Polonica (2000) vol. 73, iss. 2, pp. 117-124 | 
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Abstract
The study details an analysis of cloudiness conditions over Śnieżka Mountain in the years 1885-1995. The basis for this constituted timed observations (at 7,13 and 21 hrs) of cloud cover and mean daily cloud amount in particular months, seasons and the whole year, as well as the number of clear, overcost and foggy days. The variability to cloud cover was found to feature an upward trend of 0.4/100 years which is most clearly seen in the autumn quarter. There is a tendency for the number of clear days to decrease (by 22 days/100 years), and for the number of days with fog to increase, most especially in winter (10.4 days/100 years). A link between cloud cover and the frequency of occurrence of the western-circulation macrotype has been noticeable in the last 40 years.
Keywords: cloudiness, secular series, trend analysis, climate change, Sudetic Mountains
, Department of Meteorology and Climatology, Geographical Institute, University of Wroclaw, Kosiby 6/8, 51-670 Wroclaw