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Supplementing NCEI

22 Oct 2025 05:30 AM
The National Centers for Environmental Information (NCEI, formally NCDC) is the official US government source of climate information. Unfortunately, the current government shutdown has shuttered much of NCEI's product production, including their climate at a glance. This product provides monthly climate information for geographic areas ranging in size from the globe to cities. The IEM continues to attempt to independently replicate much of this dataset via expansive raw data processing and aggregation. The featured chart presents a comparison of yearly precipitation totals between the IEM and NCEI products for Iowa with positive values indicating the IEM estimate is higher than NCEI. While the overall bias is quite small, there are certainly periods of degraded performance and some systematic biases that likely could use some more work. A benefit of the IEM product is that it is available at a daily interval and updates in near real-time.

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Tags:   climdiv   ncei