Grouse Mountain mild as the Lower Mainland. In December (the coldest month statistically), Grouse Mountain has an average high and low of and respectively. This freeze/thaw cycle can allow for large amounts of rain to fall on some occasions every winter. Nonetheless, heavy snow is more frequent in the winter, which allows for a deep snow-pack, lasting on average from mid-November until early May. Summer is warm and relatively dry. August is the warmest month, with an average high and low of and respectively. Grouse Mountain has built an observation deck (accessible by elevator) on a 1.5 megawatt wind turbine of Leitwind
Red grouse recover. The main driver of this cyclic pattern is thought to be the parasitic nematode worm "Trichostrongylus tenuis". However, in his book, V. C. Wynne-Edwards suggests that the primary reason for mortality in grouse population is homeostasis depending largely on food availability and that the 'Grouse disease', due to the parasitic worm "Trichostrongylus tenuis" is a mistaken diagnosis of the after effects of social exclusion. The red grouse is endemic to the British Isles; it has developed in isolation from other subspecies of the willow ptarmigan which are widespread in northern parts of Eurasia and North America. It is found