Throughout the trek temperatures can vary from 27°c to -7°c ( 80°f to 20°f). At higher elevations, the temperature can vary from 16°c to -23°c (60°f to -10°f). At night we stay in warm, comfortable teahouse lodges for most of the trek. The wind is the most chilling factor, and can be quite variable, with everything from a flat calm, to brisk at basecamp. There may be snow, rain, mosquitoes in wet areas, blowing dust, heat, and bright sunshine. It is slightly chillier during April trip than in May or October. The coldest portion of the trek is the morning we walk up Island Peak, where it can get below freezing on average and it may be windy.