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Considerations on Fog Phenomenon in the North-Western Romania. Considered as a natural hazard whenever it occurs fog phenomenon has a great impact in human activity. Annual and seasonal data were used for analyzing the general trends in the number of days with fog for a period of 46 years (1961-2006) in 8 weather stations from North-Western Romania: Baia Mare, Bistriţa, Cluj-Napoca, Dej, Ocna Şugatag, Satu Mare, Sighetu Marmaţiei, Zalău. Except Satu Mare which is located in a plane area, the rest of them are located in hilly areas. For detecting and estimating trends in seasonal and annual values time series, Mann-Kendall test for trend and Sen’s slope estimates were used. As main conclusion, only one of the nine locations analyzed (Ocna Şugatag) experienced statistically significant trends (upward) for all the period considered, with a significance level of 0.01 for winter and 0.001 for spring, summer, autumn and annual values. One can also remark that, except Ocna Şugatag, there are only four weather stations that experience statistically significant trends (Bistriţa, Baia Mare, Sighetu Marmaţiei and Zalău) which are specific only for annual and for winter values.

Keywords: fog, trend, North-Western Romania.