The Iowa Environmental Mesonet (IEM) collects environmental data from cooperating members with observing networks. The data are stored and made available on this website.

IEM Daily Feature

GDD Percentiles


Posted: 20 Sep 2019 05:33 AM, Views: 316
Tags:   gdd  
The featured chart presents the daily Growing Degree Day (GDD) percentiles for Ames this year. The daily bars can be thought of as the 1 to 100 ranking of the value versus all other GDD values for that day of the year. The plot nicely shows the lack of significant heat during the late July into early September period as values are rarely above the 70th percentile. The percentile is a nice way to normalize the value to allow for more meaningful comparisons between different times of year that have much different climatologies.
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