The best time to visit the northern mountains is from September to November or from March to May, when the weather is fairly settled with dry sunny days and clear cold nights. Winters can be decidedly chilly, especially in the northeast where night frosts are not uncommon from December to February, but the compensation is daybreak mists and breathtaking sunrise views high above valleys filled with early-morning lakes of cloud. The rainy season lasts from May to September, peaking in July and August, when heavy downpours wash out bridges, turn unsealed roads into quagmires and throw in the occasional landslide for good measure. Peak season for foreign tourists is from September to November, while the rainy summer months of July and August are when Hanoians head up to the mountains to escape the stifling heat of the delta.

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