[mswann]

General mobility in Berlin 2020 compared to 2019 [0] according to Robert Koch Institute (RKI) in:

  Sep  -5 % to -13 %
  Dec -20 % to -41 %  [incomplete data]

[0] https://www.covid-19-mobility.org/current-mobility/

[llampx]

Up until early September the weather was quite warm and the COVID rates were low. Both were not the case in December.