Boston Bar sits in a pocket climate created by the confines of the canyon, and though on the edge of the coastal temperate zone just to the south, its climate is subject to the seasonal extremes of temperature common in the interior of the province. It enjoys 4 very distinct seasons with temperatures reaching up to 35-40 °C in the summer and down to -5 to -10 °C in the winter. It is notably the first place inland up the Fraser Canyon where rainfall levels are markedly lower than the rainier stretches from Yale and Spuzzum north to Hell's Gate.