Usually the first week of November is sunny, then someone flips the weather switch to precipitation and leaves it there until April. Though there are occasional cold clear days in December or January.

The year we bought our house, we saw it on Halloween, had the bid paperwork in by Nov 5, and the whole time it was bright and sunny. Three weeks later, the day we closed, it started raining hard and stayed that way until March. Turned out that was a record year for rainfall.

Last year I took vacation the last week of October and the first week of November. It was sunny and I rode every day until the rains came the last weekend.