Hot or cold, weather alone has no significant effect on Covi
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Research led by The University of Texas at Austin is adding clarity on weather’s role in Covid-19 infection, with a new study finding that temperature and humidity do not play a significant role in coronavirus spread.

This means whether it’s hot or cold outside, the transmission of Covid-19 from one person to the next depends almost entirely on human behaviour.

The study defined weather as “equivalent air temperature,” which combines temperature and humidity into a single value.

The scientists then analyzed how this value tracked with coronavirus spread in different areas from March to July 2020, with their scale ranging from U.S. states and counties to countries, regions and the world at large.

At the county and state scale, the researchers also investigated the relationship between coronavirus infection and human behaviour, using cellphone data to study travel habits.

Across scales, the scientists found that the weather had nearly no influence. When it was compared with other factors using a statistical metric that breaks down the relative contribution of each factor toward a particular outcome, the weather’s relative importance at the county scale was less than 3%, with no indication that a specific type of weather promoted spread over another.

In contrast, the data showed the clear influence of human behavior — and the outsized influence of individual behaviors.

Taking trips and spending time away from home were the top two contributing factors to COVID-19 growth, with a relative importance of about 34% and 26% respectively.

The next two important factors were population and urban density, with a relative importance of about 23% and 13% respectively.

Source: https://www.mdpi.com/1660-4601/17/21/7847
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