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
Reaching 50+°F During December
Posted: 23 Dec 2025 05:30 AM, Views: 687
Temperatures warmed very nicely on Monday with about the southwestern half of Iowa reaching 50+°F. The Ames airport reported a high temperature of 50°F, so today's featured chart looks into the frequency of having such a warm high temperature by day of December. The label on each daily bar is the number of years over the period of record for the site. For the last half of December, the average daily frequency is around 5% or about once every twenty years. We still have a number of warm days to go yet this week with the warmest temperatures forecast for Christmas Day. This may present a problem for those families that rely on the outdoors for expanded refrigerator space!
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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.
Current Data
The IEM combines data from participating networks into products like maps shown above and web applications to analyze the data.