/usr/share/kde4/config/plasmaweather.knsrc is in plasma-dataengines-addons 4:4.14.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | [KNewStuff2]
ProvidersUrl=http://www.sh0n.net/spstarr/khotnewstuff/plasmaweather-providers.xml
ChecksumPolicy=ifpossible
SignaturePolicy=ifpossible
TargetDir=plasma/dataengines
Uncompress=never
InstallationCommand=plasmapkg -t dataengine -u %f
UninstallCommand=plasmapkg -t dataengine -r %f
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