County Data
Johnson County, Iowa
Self-reliance and preparedness data for Johnson County
Relatively Moderate
Hazard Risk (14.1/100)
Moderate
Solar (4.0 kWh/m²/day)
Natural Hazard Risks in Johnson County
| Hazard | Risk Rating | Score |
|---|---|---|
| Tornado | Relatively High | 27.5 |
| Strong Wind | Relatively High | 23.7 |
| Cold Wave | Relatively Moderate | 21.7 |
| Hail | Relatively Moderate | 18.5 |
| Riverine Flooding | Relatively Moderate | 16.3 |
Source: FEMA National Risk Index. Scores 0–100, higher = more risk.
Climate Profile
Temperature & Growing Season
| January Avg | 17°F |
Water & Energy
| Annual Precipitation | 2.1″ |
| Solar Potential | 4.0 kWh/m²/day |
| Wind Speed | 3.2 m/s |
| Soil Type | Silt Loam |
Local Species
60
Edible species
25
Medicinal species
50
Autonomy Score
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Frequently Asked Questions
- What are the biggest natural hazards in Johnson County, Iowa?
- Johnson County has an overall hazard rating of Relatively Moderate based on FEMA National Risk Index data. The top threats are Tornado, Strong Wind, Cold Wave. Each hazard is scored 0–100 by likelihood and expected impact.
- Is Johnson County good for solar power?
- Johnson County has a moderate solar rating. Solar potential is based on average daily irradiance (kWh/m²/day), which determines how much energy rooftop or ground-mounted panels can produce year-round.
- How many edible plants grow in Johnson County?
- Our database identifies 60 edible plant species in Johnson County based on regional flora data, USDA hardiness zone, and iNaturalist observations. The full field guide includes identification notes, preparation methods, and seasonal availability.
- What is the autonomy score for Johnson County?
- Johnson County has an autonomy score of 50. This composite score measures local self-reliance potential across water access, food production capacity, energy resources, and supply chain resilience. Higher scores indicate greater potential for self-sufficiency.