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.

Reset App IEM Explorer (Simplified)

1 Select a Chart Type

Choose from available chart types:

2 Configure Chart Options

Which Temperature:

Select State:

Select Plot Type:

Plot Display Options:

Year:

Temperature Threshold (F):

Plot date of given observed frequency / percentiles (%): [optional]

Plot percentiles for a given date [optional]

Inclusive start year for percentiles: [optional]

Inclusive end year for percentiles: [optional]

Color Ramp:

Reverse Colormap?

Contour interval in days (optional):

Image Pixel Size @100 DPI

Image Resolution (DPI) (50 to 500)

Select Output Format:

Plot Description:

This app generates a map showing either an explicit year's first or last date or the given percentile (observed frequency) date over all available years of a given temperature threshold. Sadly, this app can only plot one state's worth of data at a time. If a given year failed to meet the given threshold, it is not included on the plot nor with the computed percentiles.

Description of Observed Frequency: If requested, this app will generate a plot showing the date of a given percentile for the first/last temperature exceedance. As a practical example of the 50th percentile, the date plotted means that 50% of the previous years on record experienced that temperature threshold by the given date.

3 Generated Chart

Based on recent timings, plot generation averages 8 seconds. Please wait while your chart is being generated...

CSV Data Excel Download

If you notice plotting issues with the image above, please contact us and provide the URL address currently shown by your web browser.

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.

15 Apr 2025: Hard Freeze after April 15th
11 Mar 2025: Avg First 70+
24 Sep 2024: First Sub 38°F
11 May 2023: Time Yet for Sub-32
11 Apr 2023: First 80 Degree Date
28 Sep 2022: September 28th Percentiles
08 Oct 2021: Should be first freeze time
29 Apr 2021: 90th Percentile Sub-32 Date
13 Sep 2019: Sub-32 5th Percentile
27 Aug 2019: 2018 First Fall sub 32
16 Nov 2017: 2017 First Fall Sub-32
27 Mar 2017: 30 years ago
21 Sep 2006: Yesterday's frost