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:

Frequency of Overcast Clouds / Clear Skies by Air Temperature by month/season (#131)

2 Configure Chart Options

Select Station:

[DSM] Des Moines [1928-01-01 till now]

Month Limiter

Overcast or Clear Sky Conditions?

Limit plot to local hour of day? (optional)

Image Pixel Size @100 DPI

Image Resolution (DPI) (50 to 500)

Select Output Format:

Plot Description:

This plot displays the frequency of having overcast or clear sky conditions reported by air temperature. More specifically, this script looks for the report of 'OVC' or 'CLR' within the METAR sky conditions. Many caveats apply with the reporting changes of this over the years. For the observation to be included, it must have a valid temperature and some sky condition reported.

3 Generated Chart

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.

27 Jun 2025: June Temps + Overcast Skies
05 Sep 2023: Clouds and Temps for September
19 Nov 2021: November Clear Skies by Temp
07 Apr 2020: April Temps + Overcast Clouds
23 Aug 2018: Clear Skies and 70s in August
09 Nov 2016: November Clouds at Temp
09 Dec 2015: Overcast and Temps