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Summer weather becomes more persistent in a 2 °C world


Heat and rainfall extremes have intensified over the past few decades and this trend is projected to continue with future global warming1,2,3. A long persistence of extreme events often leads to societal impacts with warm-and-dry conditions severely affecting agriculture and consecutive days of heavy rainfall leading to flooding. Here we report systematic increases in the persistence of boreal summer weather in a multi-model analysis of a world 2 °C above pre-industrial compared to present-day climate. Averaged over the Northern Hemisphere mid-latitude land area, the probability of warm periods lasting longer than two weeks is projected to increase by 4% (2–6% full uncertainty range) after removing seasonal-mean warming. Compound dry–warm persistence increases at a similar magnitude on average but regionally up to 20% (11–42%) in eastern North America. The probability of at least seven consecutive days of strong precipitation increases by 26% (15–37%) for the mid-latitudes. We present evidence that weakening storm track activity contributes to the projected increase in warm and dry persistence. These changes in persistence are largely avoided when warming is limited to 1.5 °C. In conjunction with the projected intensification of heat and rainfall extremes, an increase in persistence can substantially worsen the effects of future weather extremes.

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Fig. 1: Illustration of the persistence metrics.
Fig. 2: Persistence climatology for the NH mid-latitudes in JJA.
Fig. 3: Relative change in exceedance probability in JJA in HAPPI models.
Fig. 4: Drivers of changes in persistence.
Fig. 5: Relative change in exceedance probability distributions for 2 °C and 1.5 °C worlds versus 2006–2015 in HAPPI models.

Data availability

The observational data and HAPPI simulations that support the findings of this study are publicly available online at, and

Code availability

Python scripts used for the analysis are available on


  1. Coumou, D., Robinson, A. & Rahmstorf, S. Global increase in record-breaking monthly-mean temperatures. Climatic Change 118, 771–782 (2013).

    Article  Google Scholar 

  2. Lehmann, J., Mempel, F. & Coumou, D. Increased occurrence of record-wet and record-dry months reflect changes in mean rainfall. Geophys. Res. Lett. 45, 13468–13476 (2018).

    Article  Google Scholar 

  3. IPCC Climate Change 2013: The Physical Science Basis (eds Stocker, T. F. et al.) (Cambridge Univ. Press, 2013).

  4. Petoukhov, V. et al. Alberta wildfire 2016: apt contribution from anomalous planetary wave dynamics. Sci. Rep. 8, 12375 (2018).

    Article  Google Scholar 

  5. Kornhuber, K. et al. Extreme weather events in early summer 2018 connected by a recurrent hemispheric wave-7 pattern. Environ. Res. Lett. 14, 054002 (2019).

    Article  Google Scholar 

  6. Erntebericht 2018 (BMEL, 2018);

  7. Deutschlandwetter im Sommer 2018 (DWD, 2018);

  8. Stadtherr, L., Coumou, D., Petoukhov, V., Petri, S. & Rahmstorf, S. Record Balkan floods of 2014 linked to planetary wave resonance. Sci. Adv. 2, e1501428 (2016).

    Article  Google Scholar 

  9. van Oldenborgh, G. J. et al. Rapid attribution of the May/June 2016 flood-inducing precipitation in France and Germany to climate change. Hydrol. Earth Syst. Sci. Discuss. (2016).

  10. Perkins-Kirkpatrick, S. E. & Gibson, P. B. Changes in regional heatwave characteristics as a function of increasing global temperature. Sci. Rep. 7, 1–12 (2017).

    Article  CAS  Google Scholar 

  11. O. Hoegh-Guldberg, et al. in Global Warming of 1.5°C (eds Masson-Delmotte, V. et al.) 175–312 (IPCC, WMO, in the press).

  12. Pfleiderer, P. & Coumou, D. Quantification of temperature persistence over the Northern Hemisphere land-area. Clim. Dynam. 51, 627–637 (2018).

    Article  Google Scholar 

  13. Francis, J. A., Skific, N. & Vavrus, S. J. North American weather regimes are becoming more persistent: is Arctic amplification a factor? Geophys. Res. Lett. 45, 11,414–11,422 (2018).

    Article  Google Scholar 

  14. Horton, D. E. et al. Contribution of changes in atmospheric circulation patterns to extreme temperature trends. Nature 522, 465–469 (2015).

    Article  CAS  Google Scholar 

  15. Hoffmann, P. Enhanced seasonal predictability of the summer mean temperature in Central Europe favored by new dominant weather patterns. Clim. Dynam. 50, 2799–2812 (2018).

    Article  Google Scholar 

  16. Alvarez-Castro, M. C., Faranda, D. & Yiou, P. Atmospheric dynamics leading to west European summer hot temperatures since 1851. Complexity 2018, 1–10 (2018).

    Article  Google Scholar 

  17. Mitchell, D. et al. Half a degree additional warming, prognosis and projected impacts (HAPPI): background and experimental design. Geosci. Model Dev. 10, 571–583 (2017).

    Article  CAS  Google Scholar 

  18. Dosio, A., Mentaschi, L., Fischer, E. M. & Wyser, K. Extreme heat waves under 1.5 °C and 2 °C global warming. Environ. Res. Lett. 13, 054006 (2018).

    Article  Google Scholar 

  19. Zhang, X. et al. Indices for monitoring changes in extremes based on daily temperature and precipitation data. WIREs Clim. Change 2, 851–870 (2011).

    Article  Google Scholar 

  20. Zscheischler, J. et al. Future climate risk from compound events. Nat. Clim. Change 8, 469–477 (2018).

    Article  Google Scholar 

  21. IPCC Managing the Risks of Extreme Events and Disasters to Advance Climate Change Adaptation (eds Field, C.B. et al.) (Cambridge Univ. Press, 2012).

  22. Coumou, D., Di Capua, G., Vavrus, S., Wang, L. & Wang, S. The influence of Arctic amplification on mid-latitude summer circulation. Nat. Commun. 9, 2959 (2018).

    Article  CAS  Google Scholar 

  23. Mann, M. E. et al. Projected changes in persistent extreme summer weather events: the role of quasi-resonant amplification. Sci. Adv. 4, eaat3272 (2018).

    Article  CAS  Google Scholar 

  24. Coumou, D., Lehmann, J. & Beckmann, J. The weakening summer circulation in the Northern Hemisphere mid-latitudes. Science 348, 324–327 (2015).

    Article  CAS  Google Scholar 

  25. Lehmann, J., Coumou, D., Frieler, K., Eliseev, A. V. & Levermann, A. Future changes in extratropical storm tracks and baroclinicity under climate change. Environ. Res. Lett. 9, 084002 (2014).

    Article  Google Scholar 

  26. Hirschi, M. et al. Observational evidence for soil-moisture impact on hot extremes in southeastern Europe. Nat. Geosci. 4, 17–21 (2011).

    Article  CAS  Google Scholar 

  27. Donat, M. G., Pitman, A. J. & Angélil, O. Understanding and reducing future uncertainty in midlatitude daily heat extremes via land surface feedback constraints. Geophys. Res. Lett. 45, 10,627–10,636 (2018).

    Article  Google Scholar 

  28. Lesk, C., Rowhani, P. & Ramankutty, N. Influence of extreme weather disasters on global crop production. Nature 529, 84–87 (2016).

    Article  CAS  Google Scholar 

  29. Donat, M. G. et al. Global land-based datasets for monitoring climatic extremes. Bull. Am. Meteorol. Soc. 94, 997–1006 (2013).

    Article  Google Scholar 

  30. Haylock, M. R. et al. A European daily high-resolution gridded data set of surface temperature and precipitation for 1950-2006. J. Geophys. Res. Atmos. 113, D20119 (2008).

    Article  Google Scholar 

  31. Meyer-Christoffer, A., Becker, A., Finger, P., Schneider, U. & Ziese, M. GPCC Climatology Version 2018 at 1.0° (GPCC, 2018);

  32. Dee, D. P. et al. The ERA-Interim reanalysis: configuration and performance of the data assimilation system. Q. J. R. Meteorol. Soc. 137, 553–597.

  33. Zolina, O., Simmer, C., Belyaev, K., Gulev, S. K. & Koltermann, P. Changes in the duration of European wet and dry spells during the last 60 years. J. Clim. 26, 2022–2047 (2013).

    Article  Google Scholar 

  34. Murakami, M. Large-scale aspects of deep convective activity over the GATE area. Mon. Weather Rev. 107, 994–1013 (1979).

    Article  Google Scholar 

  35. McKee, T. B., Doesken, N. J. & Kleist, J. The relationship of drought frequency and duration to time scales. In Proc. Eighth Conference on Applied Climatology 179–184 (American Meteorological Society, 1993).

  36. Vicente-Serrano, S. M., Beguería, S. & López-Moreno, J. I. A multiscalar drought index sensitive to global warming: the standardized precipitation evapotranspiration index—SPEI. J. Clim. 23, 1696–1718 (2010).

    Article  Google Scholar 

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The authors would like to thank the HAPPI initiative and all participating modelling groups that have provided data. This research used science gateway resources of the National Energy Research Scientific Computing Center, a Science User Facility supported by the Office of Science of the US Department of Energy under contract no. DE-AC02-05CH11231. We thank the Met Office Hadley Centre for providing the HadGHCND dataset. We acknowledge the E-OBS dataset from the EU-FP6 project ENSEMBLES ( and the data providers in the ECA&D project ( P.P. and C.-F.S. acknowledge support by the German Federal Ministry of Education and Research (01LN1711A). K.K. is supported by the UK NERC, NCAS and NERC grant nos NE/P006779/1 and NE/N018001/1. This work was supported by the BMBF (grant no. 01LN1304A to D.C.) and the NWO (grant no. 016.Vidi.171011 to D.C.).

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P.P., C.-F.S., K.K. and D.C. conceived the study. P.P. analysed the data. P.P. wrote the manuscript with contributions from all authors.

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Correspondence to Peter Pfleiderer.

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The authors declare no competing interests.

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Peer review information: Nature Climate Change thanks Peter Gibson and the other, anonymous, reviewer(s) for their contribution to the peer review of this work.

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Supplementary Figs. 1–9 and Tables 1–4.

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Pfleiderer, P., Schleussner, CF., Kornhuber, K. et al. Summer weather becomes more persistent in a 2 °C world. Nat. Clim. Chang. 9, 666–671 (2019).

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