Frosty nights have been the norm across central and southern Western Australia since last weekend and they will persist through to this weekend.
According to FarmOnline Weather, a high has settled over the region to generate light winds and mostly clear skies, which has allowed the temperature to plummet as much as seven below average at night.
A slow-moving weather pattern means that the next few nights will be similarly cold as the last few.
Parts of the Lower West, Southwest, Southern Coastal, Great Southern, Central Wheat Belt, Eucla, Goldfields and Interior can expect further frost until early next week.
Lake Grace in the Great Southern district recorded its first sub-zero temperature early on Wednesday morning, dipping to -0.5 degrees, six below average. Perth had an overnight minimum of 2.9, five below average.
Wednesday night/Thursday morning should be similarly cold but there will be slight warming over the following few nights and mornings as cloud increases and warmer air filters down from the north of the state.
Showers are not likely to return to the region until mid-next week.