RESEARCH
2024 Becomes First Calendar Year on Record to Exceed 1.5°C of Global Warming
Multiple independent scientific agencies — NASA, NOAA, Copernicus, WMO, and Berkeley Earth — each confirmed that 2024 was the hottest year in the observational record, with the global average temperature anomaly landing between 1.46°C and 1.60°C above the 1850–1900 pre-industrial baseline. The WMO's consolidated six-dataset analysis placed the figure at ~1.55°C. This marks the first calendar year to breach the 1.5°C threshold — a benchmark long cited in climate science and embedded in the Paris Agreement. The agreement's 1.5°C limit tracks a 20-year average rather than a single year, so the breach does not formally invalidate it, but the milestone underscores the accelerating pace of long-term warming now estimated at 1.3°C.
Findings
- 2024 global average temperature anomaly was approximately 1.55°C above pre-industrial levels — the first calendar year in recorded history to cross the 1.5°C threshold
- All six major monitoring datasets (Copernicus/ERA5, Berkeley Earth, HadCRUT5, NOAAGlobalTempv6, GISTEMP, JMA) place 2024 above 1.51°C, with no dissenting agency
- 2024 exceeded 2023, the previous record year, by approximately 0.12°C — an unusually large margin for back-to-back records
- Long-term warming remains at ~1.3°C over the full observational record; the Paris Agreement 1.5°C limit references a 20-year average, not a single peak year
Delta Engine result
↔ Divergence Detected — Δ 0.0765 (threshold 0.05)
- Copernicus Climate Change Service T5 95
- WMO T5 92
- NASA T5 90
- NOAA T5 90
- Berkeley Earth T4 88
Evidence quality
avg 93 · min 85 · max 95 · spread 10