Based on NOAA Regional Weather Forecast and U.S. Naval Observatory Data Service
This page is updated automatically at 3:30am 9:30am 3:30pm 9:30pm
Updated Wed Jan 7 03:31:01 2009 [update now]
large version with cloud cover only
This page is maintained by Jaroslaw Pillardy
For comparison, here is Ithaca Clear Sky Clock, it uses different data source