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Sioux City city, IA

ZIP 51103 — Climate & Environment

Source: U.S. Census Bureau ACS 2019–2023 5-Year Estimates. Page data updated 2026-08-02.

Working ClassLow Snow Area

Climate, disaster risk, air quality, and environmental safety

Environment & Risk in ZIP Code 51103

Disaster Risk (FEMA NRI)

County-linked natural hazard risk from FEMA National Risk Index — useful for comparing insurance and disaster exposure.

FEMA’s National Risk Index rates natural-hazard risk for Sioux City city, IA as Relatively Moderate (composite score 83.3), which is elevated versus much of the country. The strongest component scores on US5 are wildfire (87.4) and flood (78.2). These scores are county-linked NRI values published for planning context — all ZIP codes in the same county share the same composite score on US5. Useful when comparing insurance and disaster exposure across areas, not a substitute for a parcel-level flood or fire determination.

Overall rating
Relatively Moderate
Risk index
83.3
Flood risk
78.2
Wildfire risk
87.4
Earthquake risk
30.8
Tornado risk
96.5
Winter weather risk
85.7
Hail risk
95.0
Air Quality (EPA AQI)

County-level annual air quality from EPA. Good days = healthy to breathe; unhealthy = sensitive groups or worse.

39
Median AQI
80.8%
Good Days

Air quality healthy to breathe

1.1%
Unhealthy / Hazardous

Sensitive groups or worse

Climate & Weather in ZIP Code 51103

Climate normals for Sioux City city, IA show little to no average snow and around 30.3 inches of annual precipitation. Pair that with FEMA NRI hazard context (overall rating Relatively Moderate) when evaluating long-term housing and insurance exposure.

7-day weather forecast

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Sunrise, sunset & moon

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Monthly Temperature

30-year climate normals (avg. monthly temperature)

Climate Data
Hardiness Zone
5a
Annual Snow Days
0
Annual Precipitation
30.28 in
FEMA NRI rating
Relatively Moderate

Climate & Environment key statistics

Climate statistics
Climate
Hardiness zone5a
Annual precip (in)30.28
Snow days0
Broadband access82.2%
Risk & Air Quality statistics
Risk & Air Quality
NRI ratingRelatively Moderate
NRI risk index83.3
Flood risk (NRI)78.2
Wildfire risk (NRI)87.4
IRS net migration983
Median AQI39
Good AQI days80.8%