Hi,
I've just solved the missing weather info on clock applet of my Ubuntu 22.04.1 LTS compiling the library from github:
sudo apt install mate-common libglib2.0-dev build-essential libgtk-3-dev libxml2-dev libxml2-dev libsoup2.4-dev libxml2-utils autopoint
wget https://github.com/mate-desktop/libmateweather/archive/refs/heads/master.zip
unzip master.zip
cd libmateweather-master/
./autogen.sh && ./configure --prefix=/usr --libdir=/usr/lib/x86_64-linux-gnu && make -j 4 && sudo make install
then you have to kill&reload the clock: killall /usr/lib/mate-panel/clock-applet
cutting the first 's' from the website url in sources I've also been able to sniff a data url:
http://aviationweather.gov/cgi-bin/data/dataserver.php?dataSource=metars&requestType=retrieve&format=xml&hoursBeforeNow=3&mostRecent=true&fields=raw_text&stationString=LIRF
(it could be useful to track future problems...)
ps: note that this procedure may fail with older releases or in future with this release