About the Index
An objective, science-based composite metric tracking changes in extreme weather frequency and intensity over time — designed to inform actuarial risk analysis, financial solvency, and climate resilience.
Why the Actuaries Climate Index Exists
The actuarial discipline focuses on understanding, pricing, and managing risk to preserve financial and societal stability.
Objective Physical Grounding
Unlike subjective opinions or speculative economic forecasts, the index measures observational physical climate extremes derived directly from validated meteorological reanalysis.
Actuarial & Underwriting Relevance
Extreme weather events drive the overwhelming share of catastrophic property losses, infrastructure failures, agricultural volatility, and mortality shocks.
Cross-Regional Comparability
By converting disparate physical indicators (degrees, millimeters, meters per second) into standardized statistical units (z-scores), conditions across diverse ecological zones can be compared objectively.
Informing Resilient Public Policy
Enables governments, multilateral institutions, and civil societies to design targeted adaptation strategies, disaster risk financing, and capital reserves.
Data sources
Copernicus (C3S) ERA5-Land reanalysis
Hourly 2 m air temperature, daily total precipitation, and 10 m U- and V-wind components.
Muñoz Sabater, J. (2019): ERA5-Land hourly data from 1950 to present. Copernicus Climate Change Service (C3S) Climate Data Store (CDS). DOI: 10.24381/cds.e2161bac (Accessed in 2026)
Copernicus (C3S) ORAS5 ocean reanalysis
Monthly mean sea level at coastal grid cells (India).
Copernicus Climate Change Service (2021): ORAS5 global ocean reanalysis monthly data from 1958 to present. Copernicus Climate Change Service (C3S) Climate Data Store (CDS). DOI: 10.24381/cds.67e8eeb7 (Accessed in 2026)
Generated using Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.