You may find here an Evaluation of the MUF data for 144MHz from 2001 until today. The data source is based upon the great DXrobot service done by Allard / PE1NWL. The yellow bars show the 'HIGH MUF' periods and the red bars show the 'ES' periods for 144MHz. This data is daily updated between beginning of April and the end of September!
The 'Today's MUF / ES' graphics on the top of the page shows the daily MUF / ES times. It's updated every 5 minutes. This graphic is free for linking to from your own website by using this link http://www.mmmonvhf.de/es/es.png