- Uses the latest HadGHCND daily temperature dataset, global trends in observed summertime heatwaves
- Calculates and analyzes annual warm spells for 1950–2011
- Studies three indices that separately focus on maximum temperature (TX90pct), minimum temperature (TN90pct) and average temperature (EHF) with respect to five characteristics of event intensity, frequency and duration
- Finds increases in heatwave/warm spell intensity, frequency and duration despite which index is employed
- Finds that TX90pct and TN90pct trends are larger and exhibit more significance for warm spells, implying that non-summer events are driving annual trends over some regions
- Finds arger increases in TN90pct aspects relative to EHF and TX90pct are also observed
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