While near surface air temperature can fluctuate significantly within a day or even day to day, the fluctuations in dew point are typically much lower as processes changing atmospheric water content are slower acting. Dew point changes during the summer season are even more muted as vegetation and available surface/soil water elevate lower atmospheric moisture content. A large change in dew point happened over much of Iowa on Wednesday with seasonally dry air on Tuesday replaced with more typical humid air just 24 hours later. For Cedar Rapids, the dew point temperature increased by 29 degrees Fahrenheit over a 24 hour period. The featured chart presents the largest such dew point increases during the summer months for the site. The recent event comes in first place and joins another Jun 2026 event within the top 10 largest increases! This has been a somewhat frequent pattern this warm season with mostly drier than average air being briefly replaced by more typical humid conditions. Dew point temperatures on Thursday were back again to below average values as drier air from the northwest visited the state.

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