June and July in Australia is the winter season, with temperatures varying throughout the country:
The southern coastal parts of the state (which includes Melbourne) have a Mediterranean climate with mild wet winters and hot dry summers. … Most of the rain in the southern districts of the State fall during the winter months when the sub-tropical high-pressure belt is displaced to the north over the Australian continent. The northern section of Australia has a more tropical influenced climate, quite warm and dry in the winter.
For more information, please see https://www.australia.com/en/facts-and-planning/weather-in-australia.html.
U.S. & Canadian citizens don’t need visas to enter Australia. However, they do have to obtain what is called an Electronic Travel Authority (ETA), which basically works like an online visa. The ETA costs AU$20 and may be applied for at http://www.eta.immi.gov.au/.
We advise all travelers to Australia to check with their respective Australian Embassies.
Beating Jet Lag:
Ten tips to help combat Jet Lag according to the Sleep Health Foundation – https://www.sleephealthfoundation.org.au/pdfs/Jet-Lag.pdf.