 The weather in the southern half of the state is generally warm to hot in summer and cool in the winter.The seasons are more defined in the southern half of the state, especially in the South West Slopes, Central West and the Riverina regions.Rainfall usually peaks in the summer in most of parts of the state, though the Riverina region, which is in the southern-central part of the state, bordering Victoria, has drier summers and a winter rainfall peak.