One of the plagues visited on hams is the odds of contact with someone specific, somewhere specific. There have been a number of predictors developed over the years that can provide some guidance, starting with guesses at the time of day when one band will work better than another and going to rather sophisticated programs that account for almost everything except luck. @BTPost uses one, successfully, that has a limited set of locations, and requires some knowledge and interpretation for proper use. I've not found it easy to use. This one works better for my MT head to get around. YMMV. VOACAP Online - professional-grade high-frequency (3-30 MHz) coverage area predictions
Payed PH a visit and looks like a real good site. Info on the online study available looks promising and will get signed up after the first..