The gauge at the airport recorded 27 millimetres for July, far below the long-term average, and almost half of which came on one day: July 2.

It follows on from a dry May and June for Launceston.

Airport rain gauges at Devonport and King Island also recorded their lowest July rainfall on record, along with Cape Bruny.

Bureau of Meterology climatologist Jonathan Pollock said diverted cold fronts had played a part in reducing rainfall statewide.

"We had persistent high pressure over south east Australia and that diverted cold fronts further south than usual and it really limited the amount of rainfall over the state," he said.

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"This month was a stark contrast to last year, to July 2019, when western Tasmania had above average rainfall - it was the highest on record from around Lake St Clair to Queenstown."

Warmer winter temperatures accompanied the dry conditions, with the mean daily temperature for Tasmania about half a degree higher than average, while the mean minimum was slightly cooler than average.

The start of July saw far warmer conditions, including days of four degrees above average along the South-West coast.

Mount Wellington/kunanyi also had its highest July mean daily temperature on record, at 4 degrees, while Liawenee and Devonport Airport recorded their highest July maximum temperatures on record.

At the other end of the scale, King Island recorded its coldest July day on record with -1.2 on July 17.