I am looking for a resource to help with picking a holiday destination. This year I would like to take some time off in August (school holidays), and I would like to find counties or regions that usually have reasonably nice weather, e.g. I would like to avoid the worst monsoon season Asia or the winter in Northern UK. In this case the obvious candidates are Europe and North America, but I am specifically looking for somewhere different.
Now, if you know where you want to go, it's fairly easy to find out what the typical weather will be like in that place over the course of the year. What about going the other way though? For a given time of year, and a given ideal set of weather conditions, how do you find out where in the world is likely to have them?
Bonus marks for a likelihood factor associated with them - e.g. somewhere with an average temperature of 15 degrees in Spring might seem nice, but if in late winters it's zero and early summers it's 30 with not much in-between, that's possibly a different story!
(This question may seem subjective, but still I think this kind of resource would be handy for anyone planning holidays. Of course, at other times one might be interested in different time of the year.)