The EU drugs regulator has stated that the Pfizer/BioNTech COVID-19 vaccine can be stored at normal freezer temperatures for short periods of time instead of being kept in ultra-cold storage.

The European Medicines Agency stated that this change would facilitaterapid roll-out of vaccines across Europe. The EU regulator gave a positive opinion to permit the transportation and storage of vaccine vials at temperatures of -25 to -15 degrees Celsius, for a one-off period of two weeks. This is a substitute to the long-term storage at a temperature of -90 to -60 degrees Celsius in special freezers, said the regulator. 

The US had also made a similar decision about the Pfizer vaccine on February 25… (NDTV - Agence France-Presse, March 26, 2021)