wmweather: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/wmweather - from package: wmweather

You may install the required package with command apt-get install {package}

Error in other languages:
wmweather: bevel nie gevind nie
wmweather: comandă negăsită
wmweather: comando não encontrado
wmweather: commande introuvable
wmweather: command not found
wmweather: käsku ei ole
wmweather: không tìm thấy lệnh
wmweather: komanda nerasta
wmweather: Kommando nicht gefunden.
wmweather: kommandot finns inte
wmweather: komut yok
wmweather: nie znaleziono polecenia
wmweather: níor aimsíodh an t-ordú
wmweather: no se encontró la orden
wmweather: no s'ha trobat l'ordre
wmweather: opdracht niet gevonden
wmweather: parancs nem található
wmweather: perintah tidak ditemukan
wmweather: príkaz nenájdený
wmweather: příkaz nenalezen
wmweather: команда не найдена
wmweather: командата не е открита
wmweather: 命令找不到
wmweather: コマンドが見つかりません