PREVIOUS DAILY ARCHIVES - How to find a previous date back to 2003:
visit the PWRS VantagePRO2 daily data archive at
http://genserva.com/wxr/dailyarchive.htm

and add the specific date in the following format to the URL address above:
yyyymmdd.txt (ex. 20030101.txt) where yyyy is the year, mm is the month, and dd is the day

Example: for January 1st, 2019, use the following http://genserva.com/wxr/dailyarchive/20190101.txt