The Holiday Weather Guide is a jazzy little flash app that allows you to view the which countries fall within a monthly average maximum and rainfall. You can view, at a glance, which countries and regions are mild and dry in July, for example. Clicking on a country brings up more detailed climate information and the most popular sights.

A zoom function would be useful, but it’s enough to give provide some initial ideas if you want to want to avoid the heat or the rain.