Summer is 30 days longer and hotter than ever. A study says this is only the beginning

Thanks to its axial tilt, Earth doesn’t just experience one season, but multiple throughout the year, NASA confirms. Depending on the angle at which it receives the sunlight, seasons come and go, temperatures shift, and everything in nature is governed by this invisible, mysterious clockwork. In the recent decade, however, the rhythm of these seasons is changing, and this change is happening faster and more abruptly than humans can fathom. In a study published on April 7, in the journal Environmental Research Letters, researchers document how these lengthening summers could send the planet and its fundamental clock upside down.

In mid-altitudes, summers are getting longer and hotter, threatening the very mechanism of nature’s timekeeping. “The changes may be very disruptive to a wide range of systems,” said the lead author of the study, Ted Scott, in a press release. Not only are the summers across mid-altitudes accumulating and packing more heat, but they are also experiencing speedier and more abrupt transitions in weather.

Before climate change had turned into such an intense menace, summers gradually emerged from spring and faded into autumn, but the transitions happening today are more abrupt relative to the 1960s period, particularly between 1961 and 1990. Researchers came to this conclusion after analyzing mid-latitude regions and inland areas, including coastal areas. Data about temperature were collected from these regions from 1961 to 2023 across land, ocean, and coastal zones in both hemispheres. They examined ten cities for temperature and seasonal trends. To process and study the trends, they utilized a system of measuring cumulative heat that builds up over summer, combining temperature and time.

Analysis revealed that the mean summer length across inland areas has increased by five to seven days between 1990 and 2023, as well as along coastal margins and oceans in midlatitudes. Since 1990, they discovered that summers have stretched by about six days per decade, which implies that they now last roughly 30 days longer than they did in the 1960s, starting early in the spring and ending late in the fall.

Fire seasons are getting longer, the duration of droughts has stretched far beyond what scientists realized, snowmelt happens earlier, and power grids are encumbered by this seasonal disruption process. For many cities, such as Sydney, Australia, summer temperatures now last about 130 days, as compared to 80 days in 1990. In Toronto, summers are expanding by eight days per decade. In Northern Hemisphere coastal areas, the rate of accumulated heat matches that of inland regions. Minneapolis gained nine days per decade, whereas Tokyo gained about two days per decade.

This shift isn’t isolated to one study. A 2021 study shows summer in the Northern Hemisphere has already expanded from 78 to 95 days between 1952 and 2011. At the same time, other seasons are shrinking, disrupting the natural balance. Another climate study found that in large lake regions, summer-like conditions are lengthening by about 8 days per decade, showing how rapidly seasonal patterns are changing.

While all this information sounds most relevant to climate scientists, we should all be more involved since it actually threatens to influence the timing of Earth’s major natural cycles. How will the accumulated heat of early summer affect the food supply? How will the timing of the extreme weather events be affected? Are the current climate models designed to suit the research and planning of these studies? The study leaves us with questions like these to explore and prompt in the future so the next generation can better manage the transitions.

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