The Iowa Environmental Mesonet (IEM) collects environmental data from cooperating members with observing networks. The data are stored and made available on this website.
60°F+ Dew Points
Posted: 25 Apr 2025 05:30 AM, Views: 780
Tags: dewpoint
The increase in humidity this week has certainly be noticeable and has helped to support numerous rounds of showers and thunderstorms. The dew point temperature for Des Moines topped out at 60°F on Thursday and such dew points are the subject of today's daily feature. The top panel presents a simple climatology of daily max dew point along with the 2025 observations. The bottom panel shows the daily frequency of having such a maximum dew point of at least 60°F. So the overall frequency this time of year is around 10%, but you can see how quickly the frequencies increase through May into June as plant transpiration, evaporation, and warming temperatures all help to support higher humidity levels.
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Previous Years' Features
2023: Daily GDD Forecast
2022: April Windy Hours
2021: Inch Coverage
2019: Adding Water to Air
2017: 70+ in April
2016: 4 Inch Forecast
2013: Worse than last year
2012: Springfield Heat Burst
2011: Remarkable April
2010: Wet weekend for most
2007: Soggy April
2006: April Frost
2004: Big swings possible
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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.