The graphs illustrate the average monthly rainfall, measured in millimetres, in Vancouver, Canada, and Washington, D.C., USA.
Overall, it is clear that Vancouver experiences highly uneven rainfall throughout the year, with very wet winters and relatively dry summers, whereas Washington, D.C. records a more consistent level of precipitation across all months.
In Vancouver, rainfall is at its highest during the winter months. December and January both record around 100 mm of rainfall, while November is almost as wet at approximately 90 mm. In contrast, the summer period, particularly July and August, sees the lowest rainfall, at just around 20 mm, creating a sharp seasonal variation.
By comparison, Washington, D.C. demonstrates a far more stable pattern of rainfall, generally ranging between 75 and 100 mm each month. The wettest months are May and October, which both receive close to 100 mm of rain, while February is the driest month, at just above 70 mm. Unlike Vancouver, Washington does not show a pronounced dry or wet season.
In summary, Vancouver’s rainfall is characterised by strong seasonal differences, with much heavier precipitation in winter than summer, while Washington maintains a relatively even distribution of rainfall throughout the year.