  COVID-19 is a new type of coronavirus disease which is caused by severe acute
respiratory syndrome coronavirus 2 (SARS-CoV-2). It originated in China in the
month of December 2019 and quickly started to spread within the country. On
31st December 2019, it was first reported to country office of World Health
Organization (WHO) in China. Since then, it has spread to most of the countries
around the globe. However, there has been a recent rise in trend in believing
that it would go away during summer days, which has not yet been properly
investigated. In this paper, relationship of daily number of confirmed cases of
COVID-19 with three environmental factors, viz. maximum relative humidity
(RH_max), maximum temperature (T_max) and highest wind speed (WS_max),
considering the incubation period, have been investigated statistically, for
four of the most affected places of China, viz. Beijing, Chongqing, Shanghai,
Wuhan and five of the most affected places of Italy, viz. Bergamo, Cremona,
Lodi, Milano. It has been found that the relationship with maximum relative
humidity and highest wind is mostly negligible, whereas relationship with
maximum temperature is ranging between negligible to moderate.
