Wet days could get 10 percent wetter and the driest group of days 10 percent drier even in places where previous modelling has shown no change to average yearly rainfall. Wetter wet days mean more chance of flooding. The timing of those heavier rain days also becomes important. There were already multiple lines of evidence showing wet days would get wetter in New Zealand, Harrington said. The drier dry days affected some of country's most prominent farming areas, including the middle of the North Island down to Wairarapa, he said.