COLD air from southern Australia and dry skies are causing cooler-than-average temperatures across Mount Isa.
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Bureau of Meteorology meteorologist Adam Blazak said conditions would become warmer when clouds formed, which was predicted to happen by about Thursday.
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He said atmospheric moisture helped to insulate the land below by trapping heat.
Drier conditions meant warmth could escape, causing cooler conditions after sundown.
Mr Blazak said overnight temperatures had hovered about five degrees below average.
The mercury dropped to 4.9 degrees yesterday and a cool start of 6 degrees is forecast for this morning, but no records have yet been broken.
The coldest June temperature recorded for Mount Isa was 37 years ago, when the mercury dropped to negative 1.3 degrees, Mr Blazak said.
A maximum temperature of 24 degrees is forecast for today.
Mr Blazak said day time temperatures were slightly cooler-than-average but this would change within the next few days.
“By the weekend, we should be getting average temperatures and clear conditions are expected,” he said.