Thanks a lot to Xymantix to have update Sysmetrix 
But things are going strangly:
1°) if in Weather Sysmetrix configuration i choose "use Weather.com" (with metrics units), i know my zip code (FRXX0280), click on "get the weather report", i get no error in connection and get back informations from weather.com BUT they do not display in the skin, i have to unload Sysmetrix, and then reload it
... If i right click on the skin, go to "Weather" then choose "Show Weather.com information" Sysmetrix crash (and windows XP want a report)
2°) if in Weather Sysmetrix configuration i choose "use Metar code" (still with metrics units), (my Metar code is the LFPN for Toussus le Noble - France), then click on "get the weather report", i get no error in connection and get back informations from weather.noa.gov BUT they do not display in skin and even after unloading / reloading Sysmetrix informations are no more displayed (as textual informations), and if i right click on the skin, go to "Weather" then choose "Show Metar Weather informations", no more crash and informations are correctly displayed in the "Metar Weather Information" Window 
Seems to me it keeps a little bug somewhere in Sysmetrix 3.42 
EDIT: just find out some other things are no more working such as Histograms, and other textual informations