Bernardo O'Higgins Base experiences a borderline polar tundra climate (Köppen ET) that is extremely close to a polar ice cap climate (Köppen EF). Average annual precipitation amounts to , and is distributed fairly evenly throughout the year, typically peaking marginally during the austral spring. Temperatures are frigid all year round; the warmest month is January with an average monthly temperature of , while the coldest month is July with an average monthly temperature of .
