The peak tourist season in New Zealand is during winter, which spans from June to August for the southern country. Throughout most of the country the temperature and humidity is too great from October through March for many tourists, making inexpensive plane tickets more readily available. High concentrations of activity, such as during high tourist season, has a greater impact on the environment; choosing to go during the low season helps offset your effect on the environment. If you do choose to take a tour of New Zealand during this time, make sure to prepare for high temperatures and maybe even a flash flood.