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March in Wellington is normally pretty good - sunny and warm, 18 to 25C, with the start of the month the better half and a few cool nights arriving towards the end. Our row gives 19.9C over 13.3C. The packing advice locals repeat is the useful part and it is all about the wind: an umbrella is often useless here, so bring a raincoat, below the knee if you can. Our row's 25.9 kph is the reason the city's nickname sticks even in a settled month. What locals themselves wear in March is long trousers and a T-shirt with a long-sleeved shirt, and a jersey for the evenings. The record: 60.8mm across 9 precipitation days, humidity 79 percent, an 18C sea and AQI 23, among the cleanest air in this dataset.

Forum posters consistently describe Nelson as one of the milder, better-weather picks on New Zealand's South Island during July, the country's coldest month overall, alongside nearby Marlborough Sounds. Posters cite typical July conditions of clear blue skies and sunny days with crisp, sometimes frosty mornings, contrasting favorably with the near-constant wet weather that persists year-round on the West Coast and in Fiordland. Posters recommend caution on frosty, slick roads before 10am or after dark given the season's regular overnight freezes. Posters generally rate July as cold but among the more reliably pleasant winter destinations on the South Island for Nelson specifically, good planning around icy mornings the main preparation needed.

Nelson sits at the top of the South Island, which the forum notes regularly records New Zealand's highest sunshine hours — the north of the country takes the rain instead. January averages 23°C with the sea at 22 and remarkably clean air. The warning that comes with all that sun is specific: UV tops 10 and 11 here in January and February, so sunblock is not optional. January is also peak holiday season — school holidays, plus Nelson's own regional anniversary weekend late in the month — and regulars point out that February typically brings longer settled spells with less wind and rain. Even hot days cool off in the evening; bring a layer.