The number of warm extreme nights is defined as annual or seasonal count of nights when the daily minimum T exceeds the 90th percentile in the calendar 5-day window for the base period 1979-2009.
The Number of Warm Extreme Nights 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 nights maps. See correlation map (monthly temperature). MERRA.vs.CRU, CFSR.vs.CRU