Home / Environment / Extreme Heat Seasons Expanding Earlier and Later
Extreme Heat Seasons Expanding Earlier and Later
15 Sep
Summary
- Extreme heat seasons are expanding significantly across more than half the globe.
- Heat waves now occur earlier in spring and later in fall, catching people off guard.
- This timing shift increases risks, overlapping with wildfires and hurricane seasons.
Extreme heat seasons are significantly expanding across more than half of the world's land areas, extending beyond traditional summer months. New research indicates that these heat periods are arriving earlier in spring and persisting later into fall.
This temporal shift poses a greater challenge for public health and emergency preparedness. Communities may be caught off guard as their systems for managing heat are often aligned with a summer calendar. The study highlights that heat waves occurring before bodies have acclimated or after prolonged exposure can be more dangerous.
Globally, regions like eastern China, northern Africa, and eastern Europe are experiencing more rapid heat season expansion into fall. Conversely, western Europe, southern Africa, and northwestern India see heat arriving earlier in spring. In the U.S., the fall extension of heat is more pronounced than the spring extension.
The research, comparing the 1980s to recent data from 2015-2024, also differentiates between dry and humid heat extremes, noting their distinct impacts. While climate change is considered the primary driver of these extended heat seasons, future studies will aim to quantify its exact contribution alongside other factors.
