I gave up on WeatherLink.Com because of missing and/or irregular data uploads.
I installed Cumulus and it's performance with my uploads to CWOP and WU have been outstanding in regularity, as long as it wasn't taken offline while I was doing other troubleshooting.
It's free to use, (donationware) and very easy to set up. Excellent support site as well.
Bye, Weatherlink.
Full disclosure: I am purely a satisfied personal user of Cumulus and have no involvement whatsoever with the developer, financially or otherwise.