December in Santa Maria is the rainiest, the windiest, and the cloudiest month of the year. In December, the weather in Santa Maria is typically warm. Average daily high temperature in December is about 18 degrees above zero. On average, Santa Maria has 19 rainy, 7 cloudy, 4 sunny, and 1 partly cloudy day in December. The rains are usually heavy. December as well as {{month_nom: February}}, and {{month_nom: February}} is considered the most uncomfortable time to visit Santa Maria.