The best time to go to Rotoroa is during the warmer months, specifically from December to March, for ideal weather for outdoor activities and travel.During these months, the weather is generally sunny and warm, with average temperatures ranging from 20°C to 25°C (68°F to 77°F). This period is great for enjoying the lake itself, whether it's for swimming, kayaking, or simply relaxing by the water. The trails around the lake and in the surrounding Nelson Lakes National Park are also more accessible and pleasant for hiking.For those interested in fishing, particularly for trout, late spring (November) through early autumn (April) offers excellent conditions. The fish are more active, and the weather is still comfortable enough to spend extended periods on the water. This also applies to those who enjoy birdwatching, as many native species are more visible during these months.While the winter months (June to August) offer a different kind of beauty with snow-capped mountains, many facilities and activities might be limited, and the weather can be quite cold and wet.