Climate variability

Variations in the mean state and other statistics (such as standard deviations, the occurrence of extremes, etc.) of the climate of all temporal and spatial scales beyond that of individual weather events. Variability may result from natural internal processes within the climate system (internal variability) or from variations in natural or anthropogenic external processes (external variability).
SOURCE: A Guidebook for the Design and Establishment of National Funds to Achieve Climate Change Priorities – UNDP