A consequence of not knowing the seasonality behind COVID-19 is that some activities are inherently safer. Positivity peaks around midday and SARS-Cov2 follows patterns of solar activity, mainly UVB.

Other examples of its seasonality are winter and summer as well as the min and max points within the solar cycle. Finding other similar points could help to understand its transmission.

Grouping cases and environmental data by day of the week shows a linear correlation between changes in atmospheric ozone and cases.

This specific pattern as well as all the data hints that the bulk of the transmission happens in the daytime. And something similar happens at weekends.

Engaging in activities at low susceptibility conditions will lead to believe that everything is safe. But it was just less likely to happen.