Hi Tony,
For sure Sunny weather could be turn to Php if needed.
You know, if you need php in a page, gauges.html as example,
only thing you have to do is to rename gauges.html to gauges.php
then, in all other pages, you have to edit menu to reflect that change.
That way you could let other page to html and only use php
on page you want to use Php. Javascript could do a lot of tricks too,
but it is executed in html or php files.
Best regards,
Jacques