Climate risk indicators give organizations a measurable way to track how physical climate hazards are changing over time. Without them, “climate risk” stays abstract. With them, you can compare locations, monitor trends, and make decisions based on data instead of assumptions.
But the term “climate indicator” means different things in different contexts. NOAA tracks seven global climate indicators to monitor planetary health. The Germanwatch Climate Risk Index ranks countries by weather-related losses. And physical risk platforms use location-specific indicators like heat wave days, drought months, and flood exposure to score individual assets. This guide covers all three categories and explains how to interpret them.
What Are the 7 Climate Indicators?
NOAA’s seven global climate risk indicators track Earth’s climate system at a planetary scale. These are not risk scores for individual locations. They are system-level metrics that confirm whether the planet is warming and how fast:
- Global surface temperature: Average land and ocean surface temperature anomaly relative to a baseline period.
- Ocean heat content: Thermal energy stored in the upper 700 meters of the ocean.
- Sea surface temperature: Temperature of the top layer of the ocean, measured via satellites and buoys.
- Sea level: Global mean sea level tracked by tide gauges and satellite altimetry.
- Arctic sea ice extent: Area of ocean covered by ice in the Arctic, measured in September (annual minimum).
- Glacier mass balance: Net change in glacier ice volume worldwide.
- Snow cover: Northern Hemisphere land area covered by snow, measured via satellite.
All seven have trended in the direction consistent with warming over the past 50 years. These global indicators set the context for physical risk analysis, but they cannot tell you whether a specific warehouse in Jakarta or a portfolio of assets in Southern Europe faces elevated risk. That requires location-specific indicators.
What Is the Climate Risk Index?
The Global Climate Risk Index, published annually by Germanwatch, ranks over 180 countries by their exposure to weather-related losses. It uses data from Munich Re’s NatCatSERVICE database and considers four indicators:
- Number of deaths (total and per 100,000 inhabitants)
- Economic losses in absolute terms and as percentage of GDP
The 2024 index (covering data through 2022) ranked Puerto Rico, Myanmar, and Haiti as the most affected territories over the previous 20-year period. The CRI is useful for country-level comparisons, but it measures past losses from realized weather events. It does not project future risk under different emission scenarios, and it does not assess risk at the asset or city level.
For forward-looking, location-specific risk assessment, organizations use a different set of climate risk indicators drawn from climate projection data.
Physical Climate Risk Indicators by Hazard
A physical climate risk analysis evaluates 12 hazards across four categories. Each hazard has a specific indicator that quantifies exposure. Here are the metrics that climate risk platforms typically report:
Temperature Indicators
- Heat wave days per year: Number of days where maximum temperature exceeds a location-specific threshold (derived from historical baselines). More heat wave days mean greater risk to workers, infrastructure cooling systems, and agricultural output.
- Cold stress days per year: Days where minimum temperature drops below a cold threshold. Relevant for freeze-thaw damage to infrastructure and crop loss in transitional climate zones.
- Mean temperature change (°C): The projected shift in average annual temperature compared to a historical baseline. A context indicator showing overall warming trajectory.
Precipitation Indicators
- Drought months per year: Months where precipitation falls below a threshold defined by historical norms. Consecutive drought months indicate sustained water shortage risk.
- Extreme rainfall days per year: Days where precipitation exceeds intensity thresholds. Drives flood risk, slope instability, and urban drainage failures.
- Annual precipitation change (mm): Shift in total annual rainfall compared to baseline. Regions gaining precipitation face different risks than those losing it.
Compound Indicators
- Fire weather days per year: Days where temperature, wind, and dryness conditions combine to create wildfire-prone conditions. Calculated from temperature and wind speed data when humidity data is unavailable.
- Landslide susceptibility score: Combines slope steepness, precipitation intensity, and land cover to estimate terrain instability. Not a daily metric, but a risk rating tied to terrain and climate interaction.
- Severe storm frequency: Annual count of days with extreme wind speeds. Reflects exposure to tropical cyclones, derechos, and other high-wind events.
Hydrological Indicators
- River flood exposure: Based on proximity to watercourses, catchment precipitation, and discharge estimates. Often supplemented with historical flood extent data.
- Sea level rise (meters): Projected increase in mean sea level at coastal locations under different emission scenarios. Drawn from IPCC AR6 regional projections.
- Water stress ratio: The ratio of water demand to available supply in a watershed. Sourced from WRI Aqueduct. Locations with ratios above 0.4 are classified as high-stress.
How to Interpret Climate Risk Indicators
Raw indicator values are hard to act on. Knowing that a location has “23 heat wave days per year by 2050” means little without context. Is that bad? Compared to what?
Risk platforms convert raw indicators into ratings using threshold-based scales. A common approach uses five tiers:
- Low: Indicator value falls within or near the historical baseline range. No meaningful change expected.
- Moderate: Some measurable increase above baseline. May require monitoring but unlikely to drive immediate action.
- High: Clear departure from baseline. Warrants assessment of asset vulnerability and potential adaptation measures.
- Severe: Significant exposure. Likely to affect operations, asset values, or insurance availability within the projection period.
- Extreme: Top-tier exposure. Requires immediate risk management response and may affect financial viability of the location.
Each hazard has its own threshold scale. Heat waves are measured in days per year, drought in consecutive dry months, sea level rise in meters of freeboard loss. The thresholds differ because the physical processes differ. A “High” rating for heat wave exposure uses different cutoff values than a “High” for water stress.
Composite Risk Scores
Most reporting frameworks (TCFD, CDP, ISSB) expect a single risk rating per location, not 12 separate scores. Composite scoring combines individual hazard ratings into one number using weighted averages.
The weighting accounts for two factors:
- Hazard importance: Some hazards carry more weight than others. Primary climate signals (heat waves, drought, river flood, sea level rise) typically receive full weight, while context indicators (temperature change, precipitation change) receive reduced weight.
- Geographic relevance: Coastal locations amplify sea level rise and storm surge, while inland locations exclude sea level entirely. Steep terrain amplifies landslide risk; flat coastal plains reduce it.
The composite score maps to the same Low-to-Extreme scale. A confidence level accompanies each composite score, indicating what proportion of the 12 hazards had data available. Scores based on 10+ hazards carry higher confidence than those based on 5-6.
Environmental Indicators vs Climate Indicators
Environmental indicators cover a broader scope than climate risk indicators. The five core environmental indicators tracked by international organizations include air quality, water quality, biodiversity, waste management, and land use change. Climate indicators are a subset of environmental indicators, focused specifically on physical climate system variables and their projected changes.
For physical risk assessment, climate indicators are what matter. Environmental indicators like biodiversity loss and soil contamination are relevant for broader ESG reporting but fall outside the scope of physical climate risk assessment.
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How to Identify Climate Risks Using Indicators
Selecting the right climate risk indicators depends on what you are trying to assess. Here is a practical approach:
- Start with location and asset type. A coastal data center faces different hazards than an inland agricultural operation. Filter the 12 hazard indicators to those relevant to your geography.
- Choose scenarios and time horizons. SSP2-4.5 (moderate emissions) and SSP5-8.5 (high emissions) bracket the plausible range. Most TCFD-aligned assessments report at 2030 and 2050 horizons. For background on these, see our guide to SSP scenarios.
- Compare baseline to future. The value of an indicator is not the absolute number, but the change from baseline. A location that already experiences 40 heat wave days per year and is projected to reach 55 faces a different risk profile than one jumping from 2 to 15.
- Examine the composite score and confidence. Low-confidence composites (based on fewer than 70% of hazards) should be flagged for additional data collection before making decisions.
- Layer in financial exposure. Combine physical risk indicators with asset values, operational dependencies, and insurance coverage to translate climate risk into financial terms. This is what frameworks like TCFD and ISSB S2 require.
Platforms like Continuuiti automate this process, providing all 12 hazard indicators with composite scores across multiple scenarios and time horizons for any coordinate on Earth.
What Makes a Good Climate Risk Indicator?
Not all indicators are equally useful. When evaluating climate risk data providers or building internal capability, look for these properties:
- Measurable and specific: “Heat wave days per year” is a good indicator. “Heat risk” without a defined metric is not.
- Baseline-referenced: An indicator should show change relative to a historical period, not just an absolute value. Absolute values lack context.
- Scenario-dependent: Good indicators are reported under at least two emission scenarios. A single-scenario projection hides the range of possible futures.
- Transparent methodology: The data source, threshold definitions, and any assumptions should be documented. If a provider cannot explain how they calculate an indicator, the indicator is unreliable.
- Appropriate resolution: For asset-level decisions, indicators derived from NEX-GDDP-CMIP6 (25 km resolution) or finer data are the standard. Country-level averages are insufficient for portfolio screening.
Frequently Asked Questions
What is a climate indicator?
A climate indicator is a measurable variable that tracks changes in the Earth’s climate system or quantifies climate-related risk at a specific location. Global indicators (like surface temperature and sea level) monitor planetary trends. Location-specific indicators (like heat wave days per year or drought months) quantify physical risk exposure for individual assets, cities, or portfolios.
What are the three types of climate risks?
Physical risk (direct damage from climate hazards), transition risk (financial losses from decarbonization policies and technology shifts), and liability risk (legal claims from climate-related damages). Physical and transition risk are the two primary categories in TCFD reporting.
What is the biggest indicator of climate change?
Global surface temperature anomaly is the most cited, but ocean heat content may be the most telling. The ocean absorbs over 90% of excess heat from greenhouse gases, making it the most sensitive measure of total energy imbalance in the climate system.
What are climate metrics?
Quantitative measures used to assess and report climate-related performance or risk. In financial reporting (TCFD, CDP, ISSB), climate metrics include GHG emissions by scope, carbon intensity, physical risk scores, transition risk exposure, and climate value-at-risk. The term overlaps with climate risk indicators but tends to emphasize financial reporting applications.
What are the key climate indicators?
At the global level, NOAA tracks seven: surface temperature, ocean heat content, sea surface temperature, sea level, Arctic sea ice, glacier mass balance, and snow cover. At the asset level, key indicators include heat wave days, drought months, extreme rainfall days, fire weather days, water stress ratio, sea level rise, and composite risk scores.
