Data, codes, and analysis:

  • The article and its supplementary document are available here (also on medRxivSSRN and ResearchGate).
  • All data collection and analysis codes are available on GitHub.
  • Official case reports from Johns Hopkins were augmented with data from the Chinese Center for Disease Control and Prevention, Iran's state level reports, and many other data sources including disaggregate data from US states and counties, Australian states and others 
  • A total of 3,739 distinct locations were included. 
  • Online weather databases were then used to gather information in each of these locations on temperature, humidity, precipitation etc over time. 

Data: Confirmed cases of COVID-19

Dataset One: global case data with weather data, download
Sources: 1) Johns Hopkins University Center for Systems Science and Engineering; 2) Chinese Center for Disease Control and Prevention; 3) Provincial Health Commissions in China; 4) State-level Departments, Iran.

Dataset Two: US counties case data with weather data, download
Source: Johns Hopkins University Center for Systems Science and Engineering.

Data: Weather 

Duration: 1/23/2019 - 4/22/2020; Collected throughout 3/15/2020 - 5/15/2020

Main variables in our model:

  • Maximum Daily Temperature, celsius
  • Minimum Daily Temperature, celsius
  • Average Daily Temperature, celsius
  • Precipitation, millimeters
  • Humidity, percentage
  • Pressure (Atmospheric), millibars
  • Windspeed, kilometers per hour
  • Ultraviolet (UV) Index
  • Ozone (O3), parts per billion volume
  • Sulfur Dioxide (SO2), parts per billion volume

Other variables we investigated:

  • Cloud Cover, percentage
  • Sun Hours (i.e., hours of sunshine received)
  • Total Snowfall, centimeters
  • Moon Illumination, percent
  • Local sunrise and sunset time
  • Local moonrise and moonset time
  • Dew Point, celsius
  • Feels Like, celsius
  • Wind Chill, celsius
  • Wind Gust (i.e., peak instantaneous speed), kilometers per hour
  • Visibility, kilometers
  • Wind Direction Degree, clockwise degrees from due north
  • Nitrogen Dioxide (NO2), parts per billion volume
  • Particulate Matter (diameter less than 2.5 micrometers), micrograms per cubic meter

Source 1 (all variables except UV Index): World Weather Online
Source 2 (UV Index): OpenWeather
Source 3 (air pollutants): European Centre for Medium-Range Weather Forecasts