The mercury plummeted over parts of Western Australia this morning, with some places seeing their coldest nights in almost half a century. In the Central Wheatbelt, Corrigin residents experienced the coldest night in 49 years as the mercury dropped to minus four. Beverley shivered through its coldest night since records began 44 years ago, also recording minus four. The Central Wheatbelt was not the only place feeling the sub-zero conditions, Narrogin in the Great Southern District had it's coldest night in 32 years, while it was 16 years since Wagin experienced a night a that was as cold, dipping to minus two. Those in the city were not spared from the nippy temperatures. Perth recorded 1.5 degrees this morning, making it the coldest minimum temperature recorded since July last year. This was also six degrees below July's average temperature of 7.6 degrees. The cold mornings were a combined effort of a large stable high pressure system sitting over southern parts of the state, with clear skies, allowing the day time warmth to escape. Tuesday morning will be slightly warmer as the cloud begins to build ahead of a cold front. This front will be bringing a burst of showers to the southwest from around midday, although a break in the clouds should see the day reaching a comfortable 19 degrees. Nights from mid-week and then likely to be significantly warmer as increased cloud over the state prevents the daytime warmth from escaping.