Having lived through this winter in the Northeast, I can promise you that SF is beautifully warm all year round. Case in point: it is a place where people use the word "freezing" to describe temperatures 10-20 degrees above the melting point of water.

The truth is any west coast city is going to seem mild year round to a northeasterner. I used to live in Seattle and felt that way up there, despite the fact that Californians seem to think it's unbearably rainy and cold.

The comparison is with NY.

Looking out my window in MN, the ground is still covered with snow and it is 16 degrees (F). SF meanwhile will be in the 60s all week which seems pretty good to me.

San Francisco has terrific weather, but you have to seek it out.