Aoraki/Mount Cook National Park in November

December through March gives you the most stable weather and longest daylight hours – sunrise around 5:30 AM, sunset after 9 PM in peak summer. But 'stable' is relative here. You might get perfect bluebird days, or you might get horizontal rain and 80 km/h winds. That's mountain weather for you. January and February are warmest but also busiest – expect crowds on popular tracks like Hooker Valley. December and March offer a sweet spot of decent weather with fewer people. Winter (June-August) transforms the park into a snow-covered wonderland, but many tracks become dangerous or impossible without mountaineering skills. Spring (September-November) can be stunning with wildflowers, but weather is unpredictable. Here's the local secret: some of the clearest, most dramatic views happen right after storms pass through. If you see clouds lifting, grab your camera and go. The park gets about 300 days of rain per year, so pack accordingly and don't let a little moisture stop you.