There are dozens of weather apps for the iPhone, but most are based on traditional data from places like the National Weather Service in the US, or the Met Office in the UK.
For the last few days I've been using the US $0.99 WeatherTrends360 Pro which has a completely different approach to weather information and forecasting. Rather than a standard 5 or ten day forecast, this app lets you look months or a year ahead. The forecasts work pretty much anywhere worldwide, and are based on trends, historical data from 6.4 million locations in 195 countries. The company claims about 80% forecast accuracy which is certainly better than flipping a coin. Weather Trends Internatio