SkiTool Usercases
How were Warm and Cold Winters Selected? - slide 2
The set of cold years was then taken to be the top 10 (coldest) years and the set of warm years was taken to be the bottom 10 (warmest) years. The set of normal years was taken to be the 10 middle years. This technique is typically used by the Climate Prediction Center for defining warm and cold seasons.
