That change seems to have worked, thank you!
I got this:
pi@HomeAutomation:~ $ sudo certbot renew --dry-run
Saving debug log to /var/log/letsencrypt/letsencrypt.log
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Processing /etc/letsencrypt/renewal/rpiweather.net.conf
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Cert not due for renewal, but simulating renewal for dry run
Plugins selected: Authenticator webroot, Installer None
Simulating renewal of an existing certificate for rpiweather.net and www.rpiweat her.net
Performing the following challenges:
http-01 challenge for rpiweather.net
http-01 challenge for www.rpiweather.net
Using the webroot path /var/www/rpiweather.net for all unmatched domains.
Waiting for verification...
Cleaning up challenges
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new certificate deployed without reload, fullchain is
/etc/letsencrypt/live/rpiweather.net/fullchain.pem
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Congratulations, all simulated renewals succeeded:
/etc/letsencrypt/live/rpiweather.net/fullchain.pem (success)
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Not sure how things got bunged up, but it must have been the result of the new system installation after the SD card in my Raspberry Pi failed. I built the new system using the latest OS version but I probably copied some of the config files off the backup of the old system.
Thank you for the help!