 The Bureau of Meteorology classify the Riverina in the Hot Dry Zone ( with cooler winters ) climatic zone . Places in this zone can be very hot in the summer months while in the winter , nights can be very cold with cool to mild days . Mean daily maximum temperatures in the Riverina range from 31 @.@ 0 ° C ( 87 @.@ 8 ° F ) in January and 12 @.@ 4 ° C ( 54 @.@ 3 ° F ) in July in Wagga Wagga to 33 @.@ 2 ° C ( 91 @.@ 8 ° F ) in January and 14 @.@ 8 ° C ( 58 @.@ 6 ° F ) in July in Hillston . 
