This morning the minimum temperature reached only 7 degrees, following a low of 7.7 on Monday July 13. This was one of the coldest days of the year, but not the coldest after Mount Isa hit a low of 3.5 degrees on May 23.

The Bureau of Meteorology said the drop in temperatures this week were caused by a slow moving pressure system.

"A slow moving, low pressure system started to develop over New South Wales and is now in the Tasman, causing much cooler temperatures to North West Queensland," a BOM meteorologist said.

"It is not moving very quickly and is bringing a dry, southerly airflow resulting in clear skies, cold temps and low dew temps.

"Temperatures are about 3-5 degrees below average and we can expect to see this hang around for a while.

"Cool over night temperatures will persist until Saturday or Sunday, daytime temps start to recover into the weekend."

The forecast for the rest of the week will remain cool with Wednesday expected to have a minimum temperature of 5 degrees and a top of 25.

Thursday will reach a top 26 degrees with an overnight temperature of 7.

Friday will reach a top of 26 degrees and a low of 7.

Into the weekend, Saturday is expected to reach a top of 28 degrees and a low of 6.

Sunday will reach a top of 29 degrees and an overnight temperature of 7.

The lake levels are currently sitting at, Lake Moondarra 75.66 per cent and Lake Julius at 88.98 per cent.

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