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The highest average temperature in Dana Point is August at 71.7 degrees. The coldest average temperature in Dana Point is December at 55.7 degrees.The most monthly precipitation in Dana Point occurs in February with 2.6 inches. The Dana Point weather information is based on the average of the previous 3-7 years of data.he most monthly precipitation in Dana Point occurs in February with 2.6 inches. The Dana Point weather information is based on the average of the previous 3-7 years of data.
If you come to the Napa Valley in the winter, early December may become your favorite time to visit the Wine Country, as it is the least crowded time the of the year. In December, the average temperature in Calistoga is 48 degrees, with an average high of 59, and an average low of 36 degrees. The average rainfall in Calistoga for December is 7.88 inches. Usually the days of wet weather are brief, followed by crisp and clear blue skies.