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. 2020 Nov 16;10(11):e041397. doi: 10.1136/bmjopen-2020-041397

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© Author(s) (or their employer(s)) 2020. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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Scatterplots of confirmed new case counts to the four meteorological variables, (A) average temperature (T) in °C, (B) relative humidity (RH) in %, (C) wind speed (SPD) in metre per second (m/s) (D) visibility (VSB) in statute miles, for all the studied datasets. Quadric regression for T, RH and SPD, and linear regression for VSB are illustrated for each dataset. Interpolation curves with 95% CIs are shown in shadow. The discovery dataset includes the major outbreak Chinese cities, while the replication datasets included provincial data in Italy, and national data around the world (except China).