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

Select Station:

Select Hour of Day:

Select Year to Compare by Month:

Select Month to Compare by Year:

Image Pixel Size @100 DPI

Image Resolution (DPI) (50 to 500)

Select Output Format:

Plot Description:

Computes the frequency of having a day within a month with an overcast sky reported at a given time of the day. There are a number of caveats to this plot as sensors and observing techniques have changed over the years! The algorithm specifically looks for the OVC condition to be reported in the METAR observation.

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.

11 Mar 2024: Another sunny month
15 Mar 2022: March Overcast
06 Jan 2021: January Cloudiness
29 Jan 2020: Plenty of Clouds
29 Jun 2018: Cloudy June
15 Nov 2017: November Cloudiness
23 Jan 2017: Overcast January
25 Feb 2016: Overcast early morning
23 Dec 2015: Gloomy at noon
22 Dec 2014: Overcast at noon