Low precipitation and maximum temperature are statistically associated with the number of infectious cases (Menebo, 2020). This contradicts the intuition of researchers, so they come up with an alternative explanation: high temperature and low precipitation would encourage people to come out and break the "stay-at-home" rule. Thus, precipitation is negatively correlated with the spread of COVID-19, and temperature is positively associated with it.

Ohio State University, Columbus

According to another research performed in Oslo, Norway, the scientists got the opposite result. In this research, the scientists collected data from the Norwegian public health institute database and weather data from the Norwegian Meteorological Institute for February 27–May 2, 2020. Then, the researchers performed a Pearson correlation for the data. As the research shows, average temperature, minimum temperature, lowest wind speed, and highest wind speed is not significantly correlated with the spread of COVID-19.

A Study on Temperature and the Spread of SARS-CoV-2 Performed in Oslo, Norway

Menebo, Mesay Moges. "Temperature and Precipitation Associate with Covid-19 New Daily Cases: A Correlation Study between Weather and Covid-19 Pandemic in Oslo, Norway." Science of the Total Environment, vol. 737, 2020, doi:10.1016/j.scitotenv.2020.139659.

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