What is the average winter like in northern California in January?

Answer 1

That's the beginning of the rainy season. Rain usually stays off and on through April. It's rare that we see any in may but it has happened. So if you're coming this wa y or have just recently moved, make sure you have a warm water proof jacket.

PS Umbrellas don't help much when the wind kicks up.

Answer 2

Fairy cold.