Northwestern and Mounitainous part of Croatia was affected by freezing rain on February 1st, 2014. It caused damage on more than 50 000 ha of forest. The main goal of this thesis is to analize which extreme weather conditions cause this type of meteorological phenomenon. Freezing rain and ice data from 13 meteorological stations in Northwestern and Mounitainous part of Croatia showed that this type of meteorological phenomenon is very rare for time range 1961 – 2015. Further analyses showed that Northwestern Croatia was warm and Gorski kotar and Lika were very warm, on February 2014. Also, analized area was affected by huge amounts od rainfall too. It can be assumed that there were extreme weather conditions on February 2014. Surface and upper level pressure charts January 30 – February 2, 2014 over Europe showed that long lasting and pronounced southern flow created contitons for strong upper level temperature inversion which is one of preconditions for freezing rain. On the Ogulin meteorological station was mostly mesured NE–E wind direction on the first day of freezing rain whilst the next day wind turned to SE. This guides to outreach of southern flow to the Ogulin region. Analysis of snow depth showed that in Northwestern Croatia and especially in Gorski kotar snow retained after freezing rain and occurrance of ice because of near surface cold air. On the other hand, on Mounitainous meteorological station Zavižan and in Lika snow melted very fast under the influence of warm air from SE flow. Analysis of ALADIN/HR model on meteorological station Zagreb-Maksimir showed that during occurrance of freezing rain there was strong temperature inversion in 800-900 m layer. Surface wind was light and grew gradually with the height. Up to 1,5 km height light surface breeze became gale. Modelled soundings on some meteorological stations confirmedthat were conditions for occurrance od freezing rain on February 1, 2014.