High pressure and ocean currents causes dry summer season in San Francisco and abundant amount rainfall in Washington, DC.
High pressure cells combine with the different ocean currents off the coasts causes a summer dry season in San Francisco and abundant rainfall in Washington, DC because these pressure cell along with ocean currents carried out moist winds which turn into clouds lead to rainfall.
When moist winds blow inland, the high terrain of the Cascade Range forces the moist air to rise into the atmosphere, forming thick clouds and steady rainfall occurs in Washington, DC while on the other hand, San Francisco experience dry summer season and wet winter season due to presence near the water bodies so we can conclude that high pressure and ocean currents causes dry summer season in San Francisco and abundant amount rainfall in Washington, DC.
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