Greenhouse-gas warming amplified sharp day-to-day temperature swings

What happened

A study combining observations, reanalysis, CMIP6 detection and attribution, and future projections found that extreme changes in daily maximum temperature became more frequent across low and middle latitudes after the 1960s, while high latitudes generally saw decreases. The authors' fingerprinting analysis identified greenhouse-gas forcing as the dominant driver of the low- and mid-latitude increase. Under the high-emissions SSP5-8.5 scenario, models projected increases by 2100 of up to about 17 percent in frequency, 3 percent in amplitude, and 20 percent in total intensity across regions containing more than 80 percent of the global population.

Why it matters

Health systems, farms, buildings, and power grids often prepare for heat and cold as separate hazards, but a rapid shift from one day to the next can create an additional stress. The largest projected percentages come from a high-emissions scenario rather than an unconditional forecast, and the study does not imply that every region—including high latitudes—will experience the same trend.

What to watch

• Whether warning systems begin treating abrupt temperature changes as a distinct risk alongside heat waves and cold spells.
• Regional validation and health, crop, building, and grid studies using locally meaningful temperature-swing thresholds.
• How the projected frequency and intensity change under moderate- and lower-emissions pathways compared with SSP5-8.5.

Sources & evidence

• Global warming intensifies extreme day-to-day temperature changes in mid–low latitudesPeer-reviewed Nature Climate Change article first published online November 21, 2025, DOI 10.1038/s41558-025-02486-9. Extreme changes were defined relative to a historical 90th-percentile threshold; the 17, 3, and 20 percent projections apply to the high-emissions SSP5-8.5 scenario.

Topics

• Temperature Swings
• Climate Attribution
• Climate Extremes
• CMIP6
• Public Health