The time in Sydney is Australian Eastern Standard Time (AEST). As in many countries far away from the equator, there is a daylight saving time in summer. So the difference to Greenwich Mean Time is usually +10 hours in summer and +11 hours in winter.
For a country with a north-south extent of over 3600 km, it is not possible to describe the climate in general. In Australia dominates a subtropical climate. Especially in the summer months there is hardly any precipitation and the usual evaporation ensures a strong dryness. Depending on the season, the average daytime temperatures range between 18 and 30 degrees. In some parts of the country the temperature raises up to 35 °C. In the colder months and depending in the region, the temperature lowers down to 7°C in a month's average.