The Iowa Environmental Mesonet (IEM) collects environmental data from cooperating members with observing networks. The data are stored and made available on this website.

IEM Daily Feature

2021 Daily High Sigma Departures

Posted: 30 Nov 2021 05:18 AM, Views: 434
Wow, what a treat the weather was on Monday in Iowa with very pleasant temperatures and even a record high temperature for Sioux City of 70 degrees set for the date. The featured chart presents daily high temperature departures this year for Sioux City expressed in terms of sigma (1 standard deviation). Such a term allows a somewhat fair comparison between temperature differences over the year as the departure gives a more representative distance away from the average based on variability for the given date. The chart shows that yesterday had the largest departure this year for the site when expressed in sigma. The near term forecast continues to advertise additional very warm days upcoming to start off December. Areas to our west may be in line to set all time record warm high temperatures during December even!
Rate Feature

Previous Years' Features
Onawa (I-29), IA Webcam:
News Items  

30 Sep - 1 Oct Outages [resolved]
Posted: 01 Oct 12:00 PM

23 Sept Outage [resolved]
Posted: 24 Sep 09:58 AM

25 May Maintenance Outages
Posted: 24 May 08:45 AM

New Website Navigation Bar
Posted: 20 Apr 02:37 PM

NEXRAD N0R Mosaic Change
Posted: 31 Mar 12:23 PM

Sign up for the Daily Bulletin

Current Website Performance:
Bandwidth: 7.1 MB/s
Requests/Second: 954

Soil Temperatures

Data from the Iowa State Soil Moisture Network is found on this website and daily soil temperature averages are used to produce the highlighted analysis.


Besides point observations of precipitation, the IEM also processes gridded rainfall products made available by NOAA. This information is archived and made available in GIS ready formats.

Download Precipitation for GIS »

Current Data

The IEM combines data from participating networks into products like maps shown above and web applications to analyze the data.

More current products »


ISU Agronomy
IIHR - University of Iowa