Check these sites for Antarctica temperatures and number of sets of long johns. Or google what you need.
South Pole Station picture and weather
https://www.esrl.noaa.gov/gmd/obop/spo/livecamera.html
South Pole Weather
https://www.esrl.noaa.gov/gmd/webdata/met/spo_met_english.jpg
McMurdo Sound picture and weather
https://www.usap.gov/videoclipsandmaps/mcmwebcam.cfm
Other Antarctica weather temperatures
https://www.accuweather.com/en/antarctica-weather