This PDF file includes:

• table S1. Global climate models used in this study, with number of runs in brackets.
  
• fig. S1. Fraction of CMIP5 models with negative correlation between temperature and precipitation.
  
• fig. S2. Effective return period of extremely hot and dry warm seasons.
  
• fig. S3. Difference in the number of concurrently extreme hot and dry warm seasons between 1870–1969 and 2001–2100.
  
• fig. S4. Change in likelihood that hot and dry warm seasons with return periods of 20 and 50 years during 1870–1969 will occur during the 21st century.
  
• fig. S5. Comparison of correlations of temperature and precipitation between CMIP5 and observation-based data sets.
  
• fig. S6. Difference in correlation of temperature and precipitation between original and detrended data.
  
• fig. S7. Serial correlation in seasonal temperature and precipitation averaged over the warm season.
  
• fig. S8. Random samples of the four Archimedean copulas used in this study.

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