Tuesday was also the coldest July day in 20 years.

The overnight temperature of minus 3.1 degrees was below the monthly average for July. Typically around this time Canberra would expect a low of minus 0.1.

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The weekend's cold front has been replaced with light winds and clear skies, meaning chilly nights and frosty starts are settling in for the week.

And yet more cold mornings are on the way this week with a high-pressure area moving in on the ACT.

Canberra can expect the overnight temperatures to fall between minus 4 and zero degrees on Wednesday with a blanket of fog potentially settling over the city, the Bureau of Meteorology reports.

BOM meteorologist Melody Sturm said when the fog doesn't clear early it can trap those overnight temperatures in, resulting in very cold mornings in Canberra.

"There's also a cold breeze about too which means it feels even colder than what it actually is," Ms Sturm said.

Ms Sturm said at 7am on Tuesday the temperature, which sat just below the zero mark, felt about four degrees cooler. A combined effect of cold winds and humidity.

"So we have cooler temperatures than usual and it feels even more cooler," she said.

The temperature in the ACT was unlikely to climb above 13 degrees this week with an overnight low of -2 degrees predicted for Thursday.

EXTRA READ: Winter 2021 snow season likely in June

The BOM was predicting the chance of rain later in the week which could bring some good snow for the mountains.

According to Ms Sturm, Monday and Tuesday next week had the potential to bring some decent snow for Mount Kosciuszko.

"It definitely could vary because it's a week out but right now we're seeing about three to four centimetres predicted for Monday and Tuesday next week," Ms Sturm said.

Perisher had 35 of its 47 lifts open on Tuesday with skiers enjoying a partly sunny day with a top of 2 degrees in the mountains.

Thredbo reported five centimetres of snow on Monday with 11 of 14 lifts open this week. Snow depths reached 54 centimetres at Spencers Creek.

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