Here is the Famers Almanac prediction for the 2009/2010 Winter. California’s Weather Prediction: Winter temperatures will be near normal in the north, on average, with above-normal rainfall. In the south, temperatures and rainfall will be below average. The stormiest periods will occur in early November, mid- and late December, and late January. Expect the coldest periods to occur in early and late December, early January, and early February.