Hourly meteorological data.
A data frame with columns
Weather station. Named origin
to facilitate
merging with flights data.
Time of recording, UTC.
Temperature and dewpoint in F.
Relative humidity.
Wind direction (in degrees), speed and gust speed (in mph).
Precipitation, in inches.
Sea level pressure in millibars.
Visibility in miles.
Date and hour of the recording as a POSIXct
date, UTC.
ASOS download from Iowa Environmental Mesonet, https://mesonet.agron.iastate.edu/request/download.phtml.