NSW might be having a second taste of Winter again tonight with minimums likely to plummet across the majority of the State once again thanks to mostly clear skies and cold air aloft. Above image via BSCH / OCF showing minimums for Sunday night / Monday morning.

After virtually the coldest March night / morning in 4 years across the majority of the State, and some areas challenging their March minimum records – another round of similar conditions is expected again tonight. This is largely being brought on by an expansive cold pool aloft which is sitting over the State. This very cold air aloft is combining with clear skies to allow maximum heat removal which is forcing temperatures to plummet.

Frost potential by BOM MetEye for 4am Monday morning

We should see the coldest temperatures along the Ranges with frost being possible along isolated parts of the Northern Tablelands and more scattered parts of the Central Tablelands and Blue Mountains. These areas are likely to drop below 4ºc once again and may even nudge 0ºc (about 1-2ºc colder than last night). The absolute coldest temperatures will of course be over the Southern Tablelands and elevated parts of the ACT, but cloud cover may prevent frost from occurring – and temperatures may drop early across these areas before cloud increases later on. 

Along the Coast (mostly through areas North of Newcastle by the looks), where cloud is evasive, we could see minimums of up to 6-8ºc below average, even for April standards. However areas South of Newcastle around Greater Sydney and the Illawarra in particular, below average minimums are expected but not quite as cold as last night.

Forecast cloud cover by Windy (EC model) for Monday morning showing large areas of clearing over the Ranges and Northern parts of the State.