Fun thing about wunderground they are still running a telnet server. I've been using it forever with some bash aliases.
alias wu='telnet rainmaker.wunderground.com'
alias weather='(sleep 0.5; echo "\n"; sleep 0.5; echo "EWR\n"; sleep 1; echo "x\n") | wu'
It uses http rather than telnet, but wttr.in is a practical replacement for this: