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St. Helena city, CA

ZIP 94574 — Climate & Environment

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

Upper Middle ClassLow Snow AreaRemote Work Hub

Climate, disaster risk, air quality, and environmental safety

Environment & Risk in ZIP Code 94574

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 St. Helena city, CA as Relatively High (composite score 95.3), which is among the highest nationally. The strongest component scores on US5 are wildfire (96.0) and flood (95.8). 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 High
Risk index
95.3
Flood risk
95.8
Wildfire risk
96.0
Earthquake risk
98.4
Tornado risk
18.3
Winter weather risk
4.2
Hail risk
8.5

Climate & Weather in ZIP Code 94574

Climate normals for St. Helena city, CA show little to no average snow and around 39.7 inches of annual precipitation. Pair that with FEMA NRI hazard context (overall rating Relatively High) 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
9b
Annual Snow Days
0
Annual Precipitation
39.71 in
FEMA NRI rating
Relatively High

Climate & Environment key statistics

Climate statistics
Climate
Hardiness zone9b
Annual precip (in)39.71
Snow days0
Broadband access97.7%
Risk & Air Quality statistics
Risk & Air Quality
NRI ratingRelatively High
NRI risk index95.3
Flood risk (NRI)95.8
Wildfire risk (NRI)96.0
IRS net migration376