Not too cold on the coast here I have no central heating and only wear coat in depth of winter, it gets colder in other parts of Tas. The NW coast is quite mild mostly much same sort of weather as Vic but not as hot here. Can get to 40% hobart way. Inland gets very cold. Wynyard sometimes gets to 2 and 0% Celcius overnight in winter but not for long and not every year. I have only seen it snow to the water and it lay most of the day twice here in the near forty years I have lived here. Funny seeing snow on the beach really weird.
May June is usually frosty July Aug rainy, sept oct windy roaring forties, Nov Dec can be anything, Jan feb good and march april beautiful settled weather. AS A RULE but it is a la ninia so anything could happen.