Winter is never a popular season for outdoor portrait session due to the weather. We are blessed in San Francisco with relatively warm weather, so even with rain and wind, a winter portrait session is not impossible, on the contrary, it could be so much fun with far less tourists and other photographers.
Not to mention there is a nice green area just behind the museum for a quick change of the scene.
Interested in booking a portrait session? Feel free to email at viviancromwellphotography at gmail dot com.