San Francisco's four seasons
San Francisco experiences all four seasons even if some of them exhibit very different conditions than those seen in other parts of the US.
Spring in San Francisco begins in March and ends in May. The days are warm and dry with cloudless skies and practically no spring-shower spells. The summer season begins in June and lasts till the end of August.
Fall lasts from September to November while winter makes its yearly round from December to February.
There are practically no rains from March through September apart from the rain spell. Most of the rain seen in this city falls between the months of November and February.
http://ggweather.com/sf/narrative.html
http://www.sftravel.com/sanfranciscoweather.html
