Average January temperatures are a high of and a low of . Average July temperatures are a high of and a low of . Temperatures reach or higher on an average of 36.9 days annually, and drop to or lower on an average of 164.6 days annually; freezing temperatures have been recorded in every month of the year and summer nighttime temperatures are usually cool, but extreme cold is rare and temperatures under are reached only on 2.9 days per winter. The highest recorded temperature in Susanville was in July 1931, and the lowest recorded temperature was on February 1, 1956.