 At low elevations, rain is unpredictable at any time of year, although the showers tend to be shorter in summer.The uplands of Wales have most rain, normally more than 50 days of rain during the winter months (December to February), falling to around 35 rainy days during the summer months (June to August).Annual rainfall in Snowdonia averages between (Blaenau Ffestiniog) and (Snowdon's summit).