San Francisco is good known for its frequent fog. In fact San Franciscans are so familiar alongside this conditions phenomenon that they are right away on first lift terms. The argue that San Francisco sees so much fog, particularly inward the summer, is that big area of H2O called the Pacific. The mutual depression temperature body of body of water waters of the Pacific cools the warm air above. Cool air doesn't concur equally much wet equally warm air. The wet so condenses equally the warm air is cooled, creating fog.
In the mornings the Sun begins to oestrus the land. Hot air rises too the cooled foggy air over the Pacific is sucked inland. As the twenty-four hr catamenia progresses the Sun heats the air too San Francisco's fog is so (usually) burned off during the afternoon.
You tin dismiss come across this procedure rattling clearly on Fogust, an interactive map visualizing San Francisco's fog past times calendar month too fourth dimension of day. The map uses historical information from NOAA's GOES-15 to supply a visual need to the historical levels of fog experienced during unlike months too over the class of a typical day.
The map has iii buttons for each calendar month of the year. Judging past times the map July too August appear to move the foggiest months. If you lot switch betwixt the x am, 12 pm too 4 pm buttons inward July too so you lot tin dismiss uncovering the procedure described above, equally the the fog forms over the Pacific, rolls inland too and so gets burned off inward the afternoon.
