The map shows the mean total precipitation in the month of April. April is a transitional month across much of southern Canada, when snow is still possible but rainfall begins to dominate the precipitation regime. Precipitation amounts across the southern interior of Canada are somewhat greater than those in January, as air temperatures warm in response to the increasing strength and duration of sunshine. Rainfall amounts onshore along British Columbia’s west coast are still in the range of 200 to 300 millimetres, somewhat less than the values in January. Likewise, in the Atlantic Provinces, precipitation amounts are less than in January, but the distribution of monthly precipitation is not as variable annually as on the Prairies or the west coast. Across northern Canada, it is still very much winter, with almost all precipitation falling as snow.