Iowa Environmental Mesonet

Iowa State University Department of Agronomy

ASOS data download

The IEM archives observations from many of the sites in the United States. This observation archive contains many sites from the MidWest back to 2001 and the rest of the country since roughly 2007. The Iowa data for the Iowa ASOS network goes back to the 1970s for some sites.

Select Network

1) Select Station/Network by clicking on location:

No site selected

In general, data from the Iowa ASOS network is almost always available. Data from other states is more sporatic. If you have any questions, please don't hesitate to contact us.

Other download pages:

Selected Station:

2) Select From Available Data:



3) Select Date Range:



4) Specific Date Range (If needed):

Start:Stop:


5) Include possible 20min observations?

    (Leave yes if unsure)

6) Format of time output:



7) Data Format:

8) Include Lat/Lons?:



8) Finally, get Data: