Hi Glenn,
For your menu, you have to see both CSS layout file.
sunny_weather1.css (for days hours)
sunny_weather0.css (for nights)
you could start by locating a section labelled:
#menusite
you'll find that line:
bottom: 233px !important;
change this number for a smaller one.
just below, a section called
#menysite li
you'll find the line below:
font: bold 120% "Trebuchet MS","Lucida Sans Unicode","Verdana","Arial",sans-serif;
change 120% for something a bit smaller
For short, all sections beginning with #menusite is for the layout of this menu.
Finally, try to keep short your menu item text.
Cheers,
Jacques