Automated Data Plotter
This application dynamically generates many types of graphs derived from various IEM data sources. Feel free to use these generated graphics in whatever way you wish.
1 Select a Chart Type
2 Configure Chart Options
Plot Description:
This autoplot generates a map of the frequency of having at least one day at-or-above or below a given threshold between an inclusive period of days.If you set the start date to a date greater than the end date, the effect is to search the period including 1 January.
3 Generated Chart
Based on recent timings, plot generation averages 5 seconds. Please wait while your chart is being generated...

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IEM Daily Features using this plot
The IEM Daily Features found on this website often utilize plots found on this application. Here is a listing of features referencing this plot type.
- 17 Jul 2025: Mid-July Highs below 75
- 10 Apr 2024: Frequency of below 20