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La Paz's forum calls May the start of the dry season — clear blue skies and plenty of sunshine, warm enough to go without a jacket in the sun during the day. Regulars are consistent that the temperature drops sharply the moment the sun sets, and that a proper fleece or medium-weight jacket is essential for the night regardless of how warm the afternoon felt.

Regulars are consistent that the city's roughly 3,600-meter elevation shapes daily comfort here more than the calendar does, humidity staying low year-round and clear blue skies typical through the tail end of the dry season this month represents. Our row backs that cool, genuinely dry read, 17.3C reading as a mild 16C, over 0.9C nights feeling -2C, with 31.2mm of rain across 12.1 days and a trace of early-season snow, 1.1cm. Regulars are specific that acclimatizing to the altitude itself, not the temperature, is the real first-day concern for most visitors arriving from sea level, headaches and shortness of breath common regardless of season. Layers that handle a genuinely large day-to-night temperature swing remain the standard packing advice. The record: humidity 77 percent, 10.9 hours of sun, a 15 kph wind and AQI 42.

Regulars are direct that the cold here is an altitude effect rather than a storm system - blue skies and pleasant daytime sun alongside nights that drop sharply once the sun sets, with a fleece usually enough in the city itself but real layers needed for sleeping. Our row backs the extreme day/night swing, 16.8C over a genuinely cold -1.6C night feeling -5C, with rain a minor presence, 14.3mm across 4.4 days, and a trace of snow, 1.4cm. Regulars are clear this city's own cold is mild next to the high-altitude Salar de Uyuni region, where the same August nights can drop to -15C or colder on a multi-day tour - a different, harsher cold than La Paz itself sees. The record: humidity 69 percent, 10.8 hours of sun, a 14.6 kph wind and AQI 27.

La Paz-forum threads on January clothing needs confirm it's the wettest month of the year at this altitude, but posters describe the actual experience as manageable rather than miserable - one visitor got by with just a hooded jacket and small umbrella, clear weather for most of the stay despite the statistical odds. The standing advice across every thread is serious layering given the altitude: warm midday sun that can flip to a genuinely cold evening within hours, a sturdy rain jacket or poncho considered essential regardless of the forecast. Crowds and prices both stay low this time of year, a real upside for anyone touring the city's cultural sites rather than heading straight to the more weather-dependent trekking routes. The record: 17.3C days feeling like 18C, 6C nights, a notably high 115mm across nearly 25 days, 1.3cm of high-altitude snowfall, 84 percent humidity and 10.1 hours of sun.

July is Bolivian winter and in La Paz the number matters less than the sun. Regulars give roughly 7 to 17C and then explain it: in direct sun you can get by in short sleeves, and the moment it sets - before six - you want jeans, a jacket and a hat. Our row's 16.4C day against a -2.1C night is that swing, one of the widest anywhere in this dataset, and it comes from 3,600m of altitude rather than latitude. The dryness helps, with winter humidity rarely above 35 percent making the cold more bearable. Anything higher is a different proposition: the altiplano and Salar sleep above 4,000m and drop to -10C, with trekking nights of -15 to -20. Layers, always. The record: 2.5cm of snow, 2.8 precipitation days and 10.4 hours of sun.