Opposite to that of the northern hemisphere, New Zealand’s balmy summer season runs from December to February. The summer months in New Zealand are December, January, and February. Climate varies from subtropical on the north to continental on south. Businesses go through a shut-down period in December, so workers take time off from work. And July is time to go to mountains and enjoy skiing, snowboarding and snowmobiling. Summer: December - February New Zealand’s many beaches and lakes are perfect to cool off during the summer months. menu2 Opposite to that of the northern hemisphere, New Zealand’s balmy summer season runs from December to February. New Year here is celebrated under the scorching rays of hot sun in the middle of summer. Due to its location in southern hemisphere New Zealand has reversed order of summer and winter months. Summer is the warmest time of the year in New Zealand, but also the busiest season for the following reasons: Most tourists prefer to visit New Zealand in summer. Temperatures range from 21 - 32 degrees celsius (70 - 90F). Summer activities tend to make the most of the sun, sea and sand.