February in Ust-Karsk is the cloudiest month of the year. In February, the weather in Ust-Karsk is typically freezing. Average daily high temperature in February is about 15 degrees below zero. On average, Ust-Karsk has 18 cloudy, 7 partly cloudy, and 4 sunny days in February. February as well as January, November, and December is considered the most uncomfortable time to visit Ust-Karsk.