Winter Storm Warnings in Sioux City, Iowa
Sioux City sits in the Missouri River valley of northwestern Iowa, where cold Arctic air masses push down from Canada and clash with moisture-laden systems sweeping up from the Plains. Over the 13 years analyzed from 2012 through 2024, the city averaged 26.1 inches (66.2 cm) of snowfall per year — enough to keep residents well acquainted with winter driving and snow removal, but not so extreme as to paralyze the region on a regular basis.
The heaviest snowfall tends to pile up during January, February, and December, when temperatures regularly bottom out around 15.8°F (−9.0°C) and snow that falls tends to stay. Notably, truly heavy snow days — those meeting the meteorological threshold for significant accumulation in a single event — average only about 0.2 days per year, meaning a major single-storm dump is a relatively rare occurrence rather than a seasonal expectation.
When the National Weather Service issues a winter storm warning for Sioux City, it signals that dangerous conditions are imminent and travel may become life-threatening. It's worth knowing that warning thresholds are not universal — what triggers a warning here in northwestern Iowa may differ from criteria used in warmer coastal regions or higher-elevation mountain areas. Always rely on local NWS guidance for the specific criteria in effect.
| Years analyzed | 13 winters (2012–2024) |
|---|---|
| Avg. annual snowfall | 26.1 in (66.2 cm) |
| Snowiest months | January, February, December |
| Avg. winter overnight low | 15.8°F (−9°C) |
| Heavy-snow days per year | 0.2 |
Climatology figures are approximate estimates for the period shown and may differ from official local records.
Watch vs warning: a winter storm watch means a major storm is possible in Sioux City within 12–48 hours (be prepared); a winter storm warning means it is happening or about to (take action now). For full definitions, see the complete winter storm warning guide.
Sioux City winter storm FAQ
Is there a winter storm warning in Sioux City right now?
The live status at the top of this page shows whether a winter storm warning, watch, or advisory is currently in effect for Sioux City, Iowa. It checks live forecast and alert data automatically and refreshes every time the page loads.
Does Sioux City get winter storm warnings often?
Sioux City sees significant snowfall in most winters, and winter storm warnings are issued in a typical season. The frequency varies year to year with the track of major storm systems.
How much snow triggers a winter storm warning in Sioux City?
There is no single national trigger: warning criteria are set by each local National Weather Service office, ranging from a couple of inches of snow in areas where snow is rare up to 6 inches or more in snow-belt regions, and significant ice accumulation can warrant a warning on its own.
What should I do during a winter storm warning in Sioux City?
Avoid travel if possible, stay indoors and keep warm, prepare for power outages, keep an emergency kit, and check on elderly or vulnerable neighbours. Follow guidance from Iowa authorities and the National Weather Service (NWS).
Winter storm warnings in nearby locations
- Winter storm warning in Sioux Falls, SD
- Winter storm warning in Omaha, NE
- Winter storm warning in Lincoln, NE
- Winter storm warning in Grand Island, NE
- Winter storm warning in Des Moines, IA
- Winter storm warning in Topeka, KS
See all locations, read the latest winter weather news, or the full winter storm warning guide. Definitions follow the National Weather Service (NWS) criteria; thresholds vary by region.