Before revision:  Going beyond a linear model, a peak at about (9.5 2.6)^\circ C seems to be present in the data. Our findings give hope that, for northern hemisphere countries, the growth rate should significantly decrease as a result of both warmer weather and lockdown policies. In general the propagation should be hopefully stopped by strong lockdown, testing and tracking policies, before the arrival of the next cold season.
After revision:  Going beyond a linear model, a peak at about (9.5 , at 99.66