Figure 4
From: The impact of temperature on the transmissibility and virulence of COVID-19 in Tokyo, Japan

Overall and three-dimensional plots of relative risks with the reference at 18.6 °C. (A) The three-dimensional plot of the association between daily mean temperature (°C) and time-delay adjusted case fatality risks (CFR) over the lags of 14 days. The reference value of temperature was median temperature (18.6 °C). (B) The estimated overall effects of mean temperature (°C) over 14 days on CFR. Blue line shows the mean relative risks, and 95% confidence intervals are shown in the gray shadings.