Net Weather provide a monthly long range weather forecast for the UK up to 3 months in advance. Forecasts are updated monthly to improve their accuracy. They use the latest long range weather forecasting data from the NCEP and process is using their in-house forecasting technology.
The long range weather forecasts on www.netweather.tv include a description of temperature and rainfall predictions for each part of the UK alongside weather maps for air pressure, rainfall and temperature. Here are examples included in their June 2015 long range weather forecast.
View the Net Weather long range weather forecast for next month here.