The climate of Hobart, the capital of Tasmania, is oceanic, with mild and rainy winters, and cool summers. Being in the southern hemisphere, it has of course the seasons reversed compared to the northern hemisphere, so in July and August it is winter.
Tasmania is the southernmost state of Australia, and consists of the main island and some smaller islands. At these latitudes (the island is located between 40 and 43 degrees south latitude) the west winds blow throughout the year, with a series of disturbances that bring rain mainly on the west side of the island. Even the wind blows frequently.
Hobart is located in the southeast, and receives 570 millimetres (22.5 inches) of rain, which is not much, but the rains are well distributed throughout the year (although summer is the least rainy season), and occur often in the form of frequent drizzle and brief showers.
Here is the average precipitation.
Average precipitation - Hobart
HobartJanFebMarAprMayJunJulAugSepOctNovDecYear
HobartJFMAMJJASONDY
Prec. (mm)453540453545456060555055570
Prec. (in)1.81.41.61.81.41.81.82.42.42.222.222.4
Days10911121212141416151312148

The average temperature in Hobart goes from 8.5 °C (47.5 °F) in July to 17.5 °C (63.5 °F) in January and February: summer is cool, but winter is mild, although the wind can exacerbate the sensation of cold. Sometimes, especially in June and July, a mass of cold air can reach the island, and in the hills and mountains of the interior you can see snow and frost. In Hobart, during the coldest nights the temperature can drop to around freezing (0 °C or 32 °F), or slightly below.
Even Tasmania, like the rest of southern Australia, in summer does not escape the hot desert wind, although here this wind comes more rarely and is generally attenuated. However, it is possible that the temperature can approach or reach 38/40 °C (100/104 °F), although these heat waves do not last long, and at night the temperature becomes almost always acceptable again.
Here are the average temperatures.
Average temperatures - Hobart
HobartJanFebMarAprMayJunJulAugSepOctNovDec
HobartJFMAMJJASOND
Min (°C)13131198556781011
Max (°C)222220181512121415171920
Min (°F)555552484641414345465052
Max (°F)727268645954545759636668

The amount of sunshine in Hobart is never excellent, because cloudy days can occur throughout the year, however, between one disturbance and the other, the sun can come out: there are at most 8 hours of sunshine per day in January, and a minimum of 4 hours in June.

Hobart

The sea in Tasmania is cold all year round, however it reaches 17 °C (63 °F) from January to March in the southern part (see Hobart) and 18 °C (64 °F) in the north.
Sea temperature - Hobart
HobartJanFebMarAprMayJunJulAugSepOctNovDec
HobartJFMAMJJASOND
Sea (°C)171717161514131313131415
Sea (°F)636363615957555555555759

When to go

The best times to visit Hobart are autumn and spring, therefore in March-April and October-November, with a preference for the first one, because the second (October-November) is a bit cooler and more rainy. Summer, from December to February, would be the best season, as the temperatures are higher, the days longer and rains rarer, but sometimes you may encounter very hot days: in these cases, however, the heat is quite bearable, due to wind and low relative humidity.
Considering that even in summer it can be a bit cold at night (lows can drop below 10 °C or 50 °F), it is advisable to bring a light jacket and a sweater, even in this period.
The Sydney-Hobart regatta takes place in the summer, in December, as well as the Hobart Cup (horse race), which takes place in February.

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