Before revision: This paper investigates the influence of air temperature and relative humidity on the transmission of COVID-19 . After estimating the serial interval of COVID-19 from 105 hand-collected pairs of the virus carrier and the infected, we calculate the daily effective reproductive number, R, for each of all 100 Chinese cities with more than 40 cases . Using the daily R values from January 21 to 23,2020 as proxies of non-intervened transmission intensity, we find, under a linear regression framework, high temperature and high humidity significantly reduce the transmission of COVID-19 , respectively.
After revision: This paper investigates the influence of air temperature and relative humidity on the transmission of COVID-19 with increased humidity and temperature. In this paper, we investigate this problem using the data from the cases with symptom-onset dates from January 19 to February 10, 2020 for 100 Chinese cities with more than 40 cases . Using the daily R values from January 21 to 23,2020 as proxies of non-intervened transmission intensity, we find, under a linear regression framework, high temperature and high humidity significantly reduce the transmission of COVID-19 , respectively.