The Lake District is famously wet -- it is one of the rainiest parts of England -- but that is precisely what keeps the valleys so green and the waterfalls so impressive. Rain is possible at any time of year, so bring waterproofs whenever you visit.
Spring and Summer (April to August) offer the longest days and the best chance of dry weather. July and August are the warmest months and the most popular with visitors, which means crowded roads and car parks, particularly on Fridays and weekends. Spring is quieter and the hillsides are alive with lambs and wildflowers.
Autumn (September to November) brings spectacular colour to the wooded valleys around Windermere, Derwentwater and Coniston Water. The crowds thin out after the school holidays, making it a fine time for walking. Bonfire Night on 5 November sees bonfires and fireworks across the region, with parkin cake and bonfire toffee -- local specialities worth seeking out.
Winter (December to February) is the quietest season. Snow on the higher fells transforms the landscape and offers a very different walking experience, though the shorter days and the possibility of ice on the ridges mean you need to be well prepared. Cosy pubs with real fires make the evenings rewarding.