McMurdo Station’s Radiosonde/Rawinsonde (Weather Balloon) observation data contained in this record comes in several formats, all are ASCII text unless otherwise noted: 1956-1982 MMYYYY.ms.txt (Starts 1956 – ends 1982) MMYYYYms.dat (Starts 1980 – ends 1982) The data prior to 1980 is organized by...

Extreme cold temperatures were observed in July and August 2023, coinciding with the WINFLY (winter fly-in) period of mid to late August into September 2023, meaning aircraft operations into McMurdo Station and Phoenix Airfield were adversely impacted. Specifically, with temperatures below −50°C,...