Hi Riccardo,
What weather software are you running.
If running Cumulus please post which version and if running original Cumulus V1 (Windows PC) or Cumulus MX (on PC, Pi, Linux etc.)
There were some major changes on how Cumulus handled characters for time date etc. in MX version. I downloaded Weather Sky template and on default version Line 486 this is first time there might be a conflict due to using new formatting as it has old style "h".
I had a similar issues on Weather Blues 2 when I changed to Cumuilus MX on a Raspberry Pi. The new formatting also caused badly formatted dates and times i other areas.
Also you could download Notepad++ (Its free and very helpful) and paste here say lines 480 to 490 and I will try and help.
As an example, here is line 486 on the original Weather Blues template
$TtempHF = $pre_time.'<#TtempH format="h'h'nn">'.$pre_date.'<#TtempH format="d ">'.$Tr_monthnames['<#TtempH format="m">'].'<#TtempH format=" yyyy">';
here is what I had to change it to
$TtempHF = $pre_time.'<#TtempH format="HH':'mm">'.$pre_date.'<#TtempH format="dd ">'.$Tr_monthnames['<#TtempH format="%M">'].'<#TtempH format="' 'yyyy">';
If you are using Cumulus MX ( I suspect you are) here is a link to the Cumulus website explaining the differences.
http://sandaysoft.com/forum/viewtopic.php?f=27&t=12908(Scroll down until you see yellow section)
Let me know if I can help you further as there are other changes
Also if you want to take a look at what I found
http://www.midlifedad.me.uk/WB2_unmodified/records.php This was using the old format
http://www.midlifedad.me.uk/WB2_modified/records.php This was using the new formatted version I did.
Andy