December in El Chalten is the sunniest month of the year. In December, the weather in El Chalten is typically warm. Average daily high temperature in December is about 10 degrees above zero. On average, El Chalten has 13 sunny, 11 rainy, 6 partly cloudy, and 1 cloudy day in December. The rains are usually moderate. December as well as April, May, June, and July is considered the most uncomfortable time to visit El Chalten.