Mandurah has shivered through its coldest morning on record.
The mercury dipped to just 3.9C at 7am on Friday, the lowest temperature since records began at the Mandurah weather station 24 years ago.
"That's not only a July record, that's an annual record," Jessica Lingard from the Bureau of Meteorology said.
"The coldest temperature we've previously reported was 4.4C on the 9th July 2015, so this is a new record for the station this morning."
Pinjarra dropped to -0.2C, Dwellingup -0.8C and Bunbury 0.9C.
Rockingham's Garden Island dipped to 6.2C.

Bushfire readiness takes centre stage at City of Kwinana's free Summer Sounds festival
WA Open Golf Championship to tee off at Secret Harbour Golf Links
Halls Head named WA's most persistent storm damage hotspot
Four illegal e-bikes to be crushed after police crackdown in Halls Head, Falcon
Aboriginal jobs and careers expo to attract 1000 attendees in Rockingham
Firefighters attend Lakelands home after reports of thick smoke
WA Government to ban screen use for younger students as part of six-month trial
Singleton General Store shutdown over illicit tobacco, vape sales
Concerns for missing Bertram woman
