Temperature in Jackson, WY Last Week Plummeted to -25ºF Equalling 65-Year-Old Record Temperatures in Jackson, WY plummeted to 25 below zero on Thursday, February 20, equalling a 65-year-old record for the date. In 1955, the mercury also dropped to -25ºF. Related: Teton Mts, WY Report: -14ºF, a Long Walk, a Short Ski, & Gorgeous Views According to Buckrail, the coldest temperature ever recorded in Jackson during the last 10 days of February was […] WeatherBrains | February 28, 2020 0 Comments