Lethem, Gyuana with Tmin of +25.3°C, the Hottest June Night in History for 4th Time in a Month!
Marek Kučera 
Despite the absence of El Niño or La Niña influences — a period known as ENSO-neutral — the tropics continue to shatter temperature records, revealing a disturbing trend of baseline warming driven by long-term climate change. One of the clearest examples is emerging in Guyana, where record nighttime temperatures are becoming the norm rather than the exception.
Lethem: A Village at the Frontline of Tropical Warming
In Lethem, a remote Amazonian village in southern Guyana, near the border with Brazil, the hottest June night in history was recorded for the third time this month. On the most recent occasion, the minimum temperature did not fall below 25.3°C, setting yet another record for the location.
This follows two other record-breaking warm nights earlier in June — underscoring a worrying persistence and repetition of heat extremes in a region that relies on cooler nights for ecological and human recovery.
Why This Is Concerning
Tropical regions like Guyana traditionally experience stable temperature ranges and refreshingly cool nights, especially during the June rainy season. However:
- High minimum temperatures reduce nighttime recovery and increase health risks
- Persistent heat stresses agriculture, biodiversity, and infrastructure
- ENSO-neutral status means that this is not a temporary anomaly caused by a short-term oceanic phase — it’s part of a larger climate shift
The continued warming, especially during periods that should be climatologically stable, signals that background global warming is now powerful enough to override typical tropical climate buffers.
A Broader Tropical Crisis
Guyana is not alone. Across South America, Africa, Southeast Asia, and the Pacific, similar patterns are emerging:
- Record hot nights in coastal and inland regions
- Minimum temperatures staying above 24–26°C with increasing regularity
- ENSO-neutral conditions failing to provide the expected “break” from extremes
These changes are being observed in lowland rainforests, savannas, and river valleys, ecosystems and communities that have adapted to a historically narrow thermal range — and are now under growing stress.
Illustration picture: https://www.14ymedio.com
