Observed changes in warm spells indices 1976-2009 (in days per decade)
12 Nov 2009
06 May 2010
29 Nov 2012, 11:37 AM
Note: new version is available!
Warm spell duration index is defined as a period of six consecutive days with the mean daily temperature exceeding 90th percentile of the baseline temperature (average daily temperature the 1961-1990 period).
The circle size depicts the magnitude of change per decade.
Geographical coverage note: Europe