Leadville has an alpine subarctic climate with cold winters and mild summers, bordering on a cold semi-arid climate. The average January temperatures are a maximum of 31.1 °F and a minimum of 3.1 °F. The average July temperatures are a maximum of 72.2 °F and a minimum of 37.8 °F. There are an average of 278 days annually with freezing temperatures, which can occur in any month of the year. The record high temperature was 86 °F on June 23, 1954. The record low temperature was −38 °F on February 21, 1995.
Average annual precipitation is 12.19 inches. The wettest year was 1957 with 22.14 inches and the driest year was 1994 with 8.81 inches . The most precipitation in one month was 4.83 inches in January 1996. The most precipitation in 24 hours was 2.10 inches on December 24, 1983. Average annual snowfall is 142.7 inches. The most snowfall in one year was 247.9 inches in 1996. The most snowfall in one month was 63.2 inches in February 1995.
No matter when you visit, it is advisable to bring a suitable jacket with you as mountain weather can change very quickly and it is wise to be prepared.