Chemult has the typical
continental Mediterranean climate (
Köppen Dsb) of the more humid parts of the Intermountain West, featuring dry summers with large
diurnal temperature swings and cold winters with cycles of heavy snowfall and dry spells. Owing to being closer to the Sierra-Cascade crest, however, Chemult is one of the snowiest inhabited places in the contiguous US, with a thirty-year average of , and it also has among the highest frequency of nights below , with an average of 257.6 nights each year falling below this temperature, including 13.4 in the summer months of July and August when days can skyrocket to or higher. Typically 17.6 days will fail to hit and 8.4 nights fall below , whilst in December and January only 3.2 days exceed . Since records began in 1937 the wettest calendar year has been 1996 with at least (several days were missing) whilst the driest has been 1994 with , though between July 1976 and June 1977 only fell. The wettest month has been December 1996 with , whilst the highest monthly snowfall has been in January 1954 and the highest for a season from July 1955 to June 1956. The average maximum snow depth is , but has been as high as on January 4, 1966 after fell the previous December. ==References==