State rankings
UV Index by State
Arizona has the highest Annual Average Daily UV Irradiance in 2020 (4,931 J/m²), followed by New Mexico (4,797 J/m²) and Hawaii (4,793 J/m²). Alaska has the lowest (1,957 J/m²).
Annual Average Daily UV IrradianceBetter directionWhether a higher or a lower value is better. A green arrow means higher is better, a red arrow means lower is better, and no arrow means neither.More in the glossary →
50 of 51 states
Annual Average Daily UV Irradiance, 2020
Darker means higher. Click a place to highlight it.
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All 50 ranked
Highest first.
Distribution Median and middle halfThe median is the middle value: half of places are above it, half below. The middle half is the range holding the central 50% of places.More in the glossary →
Each dot is one state; the lines mark the median and the middle half.
Median
3,611 J/m²
Middle half 3,140 J/m² – 4,100 J/m²
Average
3,673 J/m²
50 states
Highest
4,931 J/m²
Arizona
Lowest
1,957 J/m²
Alaska
Over time · 2005–2020
The top 5 in 2020, against the median.
- Median of all states
- Arizona
- New Mexico
- Hawaii
- Florida
- California
Data
Click a column to sort, a row to highlight that place on the charts.
50 states · # = rank by Annual Average Daily UV Irradiance
| # | ||
|---|---|---|
| 1 |  Arizona | 4,931 J/m² |
| 2 |  New Mexico | 4,797 J/m² |
| 3 |  Hawaii | 4,793 J/m² |
| 4 |  Florida | 4,596 J/m² |
| 5 |  California | 4,541 J/m² |
| 6 |  Texas | 4,529 J/m² |
| 7 |  Colorado | 4,474 J/m² |
| 8 |  Nevada | 4,419 J/m² |
| 9 |  Utah | 4,314 J/m² |
| 10 |  Oklahoma | 4,248 J/m² |
| 11 |  Louisiana | 4,242 J/m² |
| 12 |  Georgia | 4,168 J/m² |
| 13 |  Arkansas | 4,103 J/m² |
| 14 |  Alabama | 4,092 J/m² |
| 15 |  Kansas | 4,077 J/m² |
| 16 |  Mississippi | 4,068 J/m² |
| 17 |  South Carolina | 4,051 J/m² |
| 18 |  North Carolina | 4,025 J/m² |
| 19 |  Virginia | 3,937 J/m² |
| 20 |  Tennessee | 3,859 J/m² |
| 21 |  Missouri | 3,742 J/m² |
| 22 |  Kentucky | 3,733 J/m² |
| 23 |  Wyoming | 3,720 J/m² |
| 24 |  Nebraska | 3,663 J/m² |
| 25 |  Illinois | 3,615 J/m² |
| 26 |  Oregon | 3,607 J/m² |
| 27 |  Idaho | 3,604 J/m² |
| 28 |  Delaware | 3,512 J/m² |
| 29 |  Maryland | 3,503 J/m² |
| 30 |  Indiana | 3,486 J/m² |
| 31 |  West Virginia | 3,484 J/m² |
| 32 |  Ohio | 3,384 J/m² |
| 33 |  South Dakota | 3,284 J/m² |
| 34 |  New Jersey | 3,264 J/m² |
| 35 |  Pennsylvania | 3,257 J/m² |
| 36 |  Iowa | 3,254 J/m² |
| 37 |  Montana | 3,209 J/m² |
| 38 |  Washington | 3,117 J/m² |
| 39 |  Connecticut | 3,100 J/m² |
| 40 |  Rhode Island | 3,084 J/m² |
| 41 |  North Dakota | 3,041 J/m² |
| 42 |  Michigan | 3,021 J/m² |
| 43 |  Wisconsin | 3,005 J/m² |
| 44 |  Minnesota | 3,003 J/m² |
| 45 |  New York | 3,002 J/m² |
| 45 |  Massachusetts | 3,002 J/m² |
| 47 |  Maine | 2,937 J/m² |
| 48 |  New Hampshire | 2,921 J/m² |
| 49 |  Vermont | 2,873 J/m² |
| 50 |  Alaska | 1,957 J/m² |
What correlates with Annual Average Daily UV Irradiance (2020)?
Pearson r against 2,113 other state metrics sharing at least 30 states. Correlation is not causation.
Higher together
Places that have a higher Annual Average Daily UV Irradiance tend to score higher on these
Opposite directions
Places that have a higher Annual Average Daily UV Irradiance tend to score lower on these
- Plot
- Plot
- Average Days with Accumulated Snow 1 or More Inches Deep 1980-2010Snowiest StatesPlotr = −0.77 · very strong · n = 48
- Plot
- Plot
- Most & Least Intelligent States Index (Guru99)Dumbest States in the United StatesPlotr = −0.73 · very strong · n = 30
Quick answers
- Which state has the highest Annual Average Daily UV Irradiance?
- Arizona has the highest Annual Average Daily UV Irradiance in 2020, at 4,931 J/m², followed by New Mexico (4,797 J/m²) and Hawaii (4,793 J/m²).
- Which state has the lowest Annual Average Daily UV Irradiance?
- Alaska has the lowest Annual Average Daily UV Irradiance in 2020, at 1,957 J/m².
- What is the median Annual Average Daily UV Irradiance across US states?
- The median is 3,611 J/m² across the 50 US states with data in 2020.
- Where does this uv index by state data come from?
- Rankodex compiles it from World Population Review and the primary sources it cites: EPH Tracking - CDC National Environmental Public Health Tracking Network; UV Index Search - US Environmental Protection Agency; UV Index Search - US Environmental Protection Agency.