Winters can be very cold in most areas, especially in the inland and Great Plains regions, with daytime temperatures typically -15 °C (5 °F) and as cold as −40 °C (−40 °F), with a wind chill index and often at severe levels[87] 。 Snow can cover the ground for up to six months in the inland areas, while heavy snow in the north can last all year. On the coast of British Columbia, for example, Vancouver has a temperate climate. On the eastern coast, the highest average temperature is around 20 °C (68 °F). Inland, average summer temperatures range from 25 to 30 °C (77–86 °F), while occasionally temperatures rise to 40 °C (104 °F).