Hi there, and welcome to JA!
The closest weather station to 95448 is at the Santa Rosa Airport, which as you might or might not know, is 6 or 7 miles south of Healdsburg.
Here is the October 2005 weather: http://printer.wunderground.com/history/airport/KSTS/2005/10/1/MonthlyHistory.html?printfeature=calendar
Here is the November 2005 weather: http://printer.wunderground.com/history/airport/KSTS/2005/11/1/MonthlyHistory.html?printfeature=calendar
Those pages list high/low temperatures and the precip. They also list the averages.
Let me know if you have any questions. If not, thanks for pressing "Accept".