Lithuanian climate lies between maritime and continental, with wet and mild winters, but during the coldest months the temperature may drop to -300C for some short period. Average temperature in winter: -4,9°C, average temperature in summer: 20,0°C , rainfall per year – 748 mm (please check this site for further information http://www.climate-zone.com/climate/lithuania/). Hardiness zone changes from 6 (coast) to 4 (Vilnius surroundings). Please check the hardiness zone map also – http://www.uk.gardenweb.com/forums/zones/hze.html