We all need to go for a weekend of camping every so often; Diamond O, California is a tremendous site for getting out. All the merry folks and the perfectly managed operations will make you feel great. Camping in California is such a fun activity. Diamond O is to be found in the Santa Rosa Mountains. Through the warmest time of the year here at Diamond O, high temperatures commonly reach the 80's with nighttime lows in the 60's. The wintertime comes with highs in the 60's; during the dark hours in the winter at Diamond O temperatures drop to the 40's. It is very dried up here at Diamond O commonly. The month of March is the wettest with most of the rain while July is the month with the least amount of precipitation.