The Iowa Environmental Mesonet (IEM) collects environmental data from cooperating members with observing networks. The data are stored and made available on this website.
Earliest 75+°F
Posted: 11 Feb 2026 05:30 AM, Views: 610Tags: 2026
Yesterday's daily feature highlighted the 13 degree smashing of the previous record high for 9 February for Sioux City. The high temperature was 75°F, which is easily the earliest temperature that warm on record for the site and is the subject of today's featured chart. The chart presents the first day each year with a high temperature of at least 75°F for Sioux City along with the subsequent number of days that year with as warm a daily high temperature. The right hand tables list out stats for this metric. Monday's record was 17 days earlier than the previous earliest reading found on 26 Feb 2024 and 1896! The 50th percentile for the first such date isn't until a number of days into April with a handful of years having to wait until May before reading such a warm high temperature! It was certainly remarkable early season warmth, which was helped by recently dry and snow free conditions.
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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.




