Download: Descriptions of the IRI Climate Forecast Verification Scores

The verification maps and time series show skills of IRI’s forecasts issued in real time from late 1997 to present. The forecasts since April 2017 are upscaled to a 2.5-degree grid for precipitation (2.0 degree grid for temperature) to match the horizontal resolution of the previous system for continuity. The observed datasets used are the NOAA/Climate Prediction Center CAMS data for temperature, and the NOAA/Climate Prediction Center CAMS/OPI (satellite data only) for precipitation.

Hindcast skill verification for the current forecast system (as of May 2023) using RPSS and Reliability are available here.