Why do I need to run the Weather Generator 100 times?

Sampling at a number of different points across the full UKCP09 probabilistic distribution allows a range of plausible outcomes to be explored.

In detail

Instead of using a single change factor, the UKCP09 Weather Generator is driven by mutliple samples (at least 100) from the UKCP09 probabilistic distribution. This process extracts many change factors to perturb the baseline data to get many realisations of future daily climate. This means that instead of getting a single time series of future data you will get, for example, 100 plausible time series of future daily climate.