The number of cold extreme days is defined as annual or seasonal count of days when the daily minimum T is lower than the 10th percentile in the calendar 5-day window for the base period 1979-2009.
The Number of Cold Extreme Days Maps Note: Part of South America where the reanalysis is very low correlated with observation (CRU Temperature) is enclosed by heavy black lines on the following extreme days maps. See correlation map (monthly temperature). MERRA.vs.CRU, CFSR.vs.CRU