Winters are cold and dry with mean temperatures below . Winters are relatively cold with average high temperatures of and lows of . Summers are warm and sometimes humid with average high temperatures of and lows of . Autumns feature decreasing temperatures and precipitation. Summers are warm to hot and sunny with average daytime maximum temperatures of . Winters are cool with average high temperatures of and lows of . Mean maximum winter temperatures in July are . Summers are generally warm, averaging at with daytime temperatures of . Another method considered for producing the warm polar temperatures were polar stratospheric clouds. Winter&colon; tyres for low temperatures and snow. In the west, winter temperatures average below . In winter mean minimum temperatures of or are common. In winter, mean minimum temperatures of or are common. The summers are mild and agreeable with average maximum temperatures between . The holding temperatures and salinity vary according to species.