To great fanfare, the National Centers for Environmental Information (NCEI) released its updated climate averages dataset yesterday. This dataset is refreshed every ten years summarizing the weather over the past 30 years. This dataset has many components to it, but the common one folks want to know is the average daily high and low temperature. The featured chart presents a comparison of the last three versions of the NCEI daily climatology for Des Moines during May along with an IEM computed simple daily average over the current 1991-2020 period. The NCEI climatology is more involved than a simple daily average and has various smoothing functions applied along with more rigorous quality control. The 1971-2000 dataset only had values in whole degree Fahrenheit, which is why it appears more choppy than the other values shown. Anyway, you will find various IEM apps now using this updated dataset and the NWS as well now uses it to express what today's averages are.

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