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Environmental factors, including seasonal climatic variability, can strongly impact on spatio-temporal patterns of infectious disease outbreaks, but relationships between Covid-19 dynamics and climate remain controversial. We assessed the impact of temperature and humidity on the global patterns of Covid-19 early outbreak dynamics during January-March 2020. Here we show that Covid-19 growth rates peaked in temperate regions of the Northern Hemisphere with mean temperature of ~5 C, and specific humidity of 4-6 g/m3 during the outbreak period, while they were lower both in warmer/wetter and colder/dryer regions. Relationships between Covid-19 and climate were robust to the potential confounding effects of air pollution and socio-economic variables, including population size, density and health expenditure. The strong relationship between local climate and Covid-19 growth rates suggests the possibility of seasonal variation in the spatial pattern of outbreaks, with temperate regions of the Southern Hemisphere becoming at particular risk of severe outbreaks during the austral autumn-winter.
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10.1101/2020.03.23.20040501
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document_parses/pdf_json/b372fb60de3034f3768e4fb6bfaa44ecde5290be.json
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Climate affects global patterns of COVID-19 early outbreak dynamics
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