This is a THEME for the ClearWeather screenlet that comes with Screenlets.
This screenlet works best in 'mini-mode' (right click > toggle mini mode) as some of the icons can obscure the '6 days' info on the bottom.
Open the screenlets manager
select (click on) the 'ClearWeather' screenlet a
Click 'install theme' from the left-hand side panel
Navigate to the clean white.tar.gz theme and click okay.
Restart the 'ClearWeather' screenlet and select 'clean white' from the 'themes' dialog.