IEM Computed Daily Summary of Observations

This tool lets you download daily summaries computed from collected observations for a site or all sites in a network. For COOP networks the daily values reflect the once-daily reports. When requesting all stations, limit the date span to one year.

The definition of a day usually follows the local calendar day for each station's timezone, but some stations provide standardized local-time summaries which override computed totals.

Backend documentation

1. Choose Network


Switching networks updates available stations below.

2. Select Stations, Dates, and Variables

Automation Example with Curl

This command and URL should replicate your current form selections:

curl 'https://mesonet.agron.iastate.edu/cgi-bin/request/daily.py?network=IT__ASOS&year1=2025&month1=1&day1=1&year2=2025&month2=8&day2=21&na=blank&format=csv' -o changeme.txt

Stations

Station Metadata

IT__ASOS Station Selector


Available: 0 stations
Selected: 0 stations

Online stations with current data
Offline stations or no recent data
Date Range (inclusive)
Start Date
End Date

For all stations limit span to <= 1 year for performance.

Variables

Values of 0.0001 inches represent trace precipitation.