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 pattern is characterised by dramatic seasonal variation, with a pronounced peak during the winter months and a sharp decline throughout the hot summer period. This creates a clear contrast between wet and dry seasons. On the other hand, Washington, D.C. experiences a much steadier and more evenly distributed level of precipitation across the year, with only minor fluctuations between different months. While Vancouver’s climate can be described as highly variable and strongly dependent on the season, Washington maintains a relatively balanced rainfall pattern overall, which indicates a less extreme difference between winter and summer conditions.