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2025 State Climate Summaries

TECHNICAL DETAILS AND ADDITIONAL INFORMATION

1. Overview

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a. Past Climate

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b. Future Climate

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2. Datasets

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a. Historical Climate Conditions

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NOAA U.S. Climate Divisional Database

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NOAA Global Historical Climatology Network

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b. Climate Projections

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Coupled Model Intercomparison Project Phase 6

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Scenarios Used in CMIP6 Simulations

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3. Analyses

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a. Choice of Reference Periods

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b. Observed and Projected Temperature Change Figures

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Observed Temperature Trends

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c. Statewide Temperature and Precipitation Metrics

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Use of 5-year Averages

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Annual and Seasonal Calculations

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Threshold Exceedances

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d. Precipitation Projections Maps

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e. Observed and Projected Sea Level Change Figures

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f. Tidal Flooding Figures

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g. State-specific Figures

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4. Additional Information

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