Europe’s hotter summers may be doing more than stressing power grids and public-health systems: they are also reshaping voters’ political priorities. A new study finds that people exposed to unusually high temperatures become more concerned about climate change, feel a stronger sense of personal responsibility, and are more likely to support Green parties or coalitions that include them. The research links extreme weather with greener voting across Europe.
Published in the Proceedings of the National Academy of Sciences, the study draws on individual-level European Social Survey data collected between 2012 and 2022 across 25 countries. Researchers combined respondents’ answers about climate attitudes and voting intentions with measurements of unusual warmth in the year preceding elections. The authors were Jacopo Bassetto, Roman Hoffmann, Raya Muttarak, Jonas Peisker, and Piero Stanig. The study’s research summary identifies the dataset, authors, and decade-long scope.
The effect was measurable rather than merely anecdotal. For every additional degree of excess temperature recorded during warm spells, the probability that a respondent would vote for a Green party rose by 2.8 percentage points. The same increase in heat was associated with a 4-point rise in climate-change concern and a 2.5-point increase in the feeling that individuals share responsibility for the crisis. Another estimate found that an additional unusually warm day per week increased the likelihood of supporting Green parties or Green-backed coalitions by roughly 5 percentage points. The researchers’ paper provides the temperature estimates and confidence intervals.
Those shifts were not evenly distributed. Women and people with higher levels of education were already more likely to express pro-environmental views and support Green parties. The largest changes after unusually hot periods appeared among less-educated men, a group that generally begins with lower levels of climate concern. That pattern suggests direct experience can narrow some of the political divide around climate policy, even if it does not erase differences tied to income, ideology, or local economic interests. Additional coverage of the findings highlights the strongest shifts among less climate-minded voters.
The results build on earlier research showing that environmental shocks can influence elections, while also adding a broader geographical and psychological picture. Studies of Germany’s deadly 2021 floods found modest but detectable gains for the Greens in affected municipalities, including evidence that some previous supporters of other parties switched sides. Research on heat, drought, and temperature anomalies has likewise found stronger pro-Green effects in parts of Europe where extreme conditions are less familiar. Earlier European research found that heat episodes and dry spells can raise environmental concern and Green voting.
For Green parties, the findings point to a political opportunity that comes with an obvious warning: weather alone does not guarantee electoral success. Voters still weigh economic security, government performance, energy prices, and whether climate policies appear practical and fair. But as extreme heat becomes more frequent, the study suggests that climate change is increasingly moving from an abstract policy issue into a personal experience—one capable of changing not only what Europeans worry about, but how they vote.
