In the valleys of the rivers Una and Vrbas there are cold airstreams from north and warm from south. Therefore this area has moderate-continental climate with a certain impact of Mediterranean and Pannonic climate; and on a smaller part, which falls to higher zone, there is a slight impact of Alps climate.  Average annual precipitations are around 900 mm in the north, to 1400 mm in the south. More than half of this rainfall occurs in a vegetation period. Snow blanket will last depending on height above sea level: above 500 m it will last for more than 40 days, and below 500 m less than 30 days.  According to weather forecast, average air temperature in July is 21,1⁰ C.  The warm period, which can be considered as vegetation period, lasts from May to around the middle of October.