UV Index in Altadena, United States
Last updated: January 2, 2025
Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.| | 07:00 | 08:00 | 09:00 | 10:00 | 11:00 | 12:00 | 13:00 | 14:00 | 15:00 | 16:00 | 17:00 | 18:00 | 19:00 |
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| UVI | 1 | 1 | 2 | 3 | 4 | 4 | 4 | 3 | 2 | 1 | 1 | 0 | 0 |
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| Exposure | Low | Moderate | Low |
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| Time to burn | 45 min | 30 min | 45 min |
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UV Index throughout the year in Altadena
UV Index (UVI) in Altadena. Generated using Copernicus Atmosphere Monitoring Service information. Data for the period from January 2022 to January 2023.| | 07:00 | 08:00 | 09:00 | 10:00 | 11:00 | 12:00 | 13:00 | 14:00 | 15:00 | 16:00 | 17:00 | 18:00 | 19:00 |
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| January | 1 | 1 | 2 | 3 | 4 | 4 | 4 | 3 | 2 | 1 | 1 | 0 | 0 |
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| February | 1 | 1 | 3 | 4 | 5 | 6 | 5 | 4 | 3 | 1 | 1 | 0 | 0 |
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| March | 1 | 2 | 3 | 5 | 6 | 8 | 8 | 8 | 6 | 4 | 2 | 1 | 1 |
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| April | 1 | 2 | 3 | 6 | 8 | 10 | 10 | 9 | 7 | 4 | 2 | 1 | 1 |
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| May | 1 | 2 | 4 | 6 | 9 | 10 | 11 | 10 | 8 | 5 | 3 | 1 | 1 |
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| June | 1 | 2 | 4 | 7 | 9 | 11 | 11 | 10 | 8 | 6 | 3 | 2 | 1 |
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| July | 1 | 2 | 4 | 7 | 9 | 11 | 12 | 11 | 9 | 6 | 3 | 2 | 1 |
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| August | 1 | 2 | 3 | 6 | 9 | 10 | 11 | 10 | 8 | 5 | 3 | 1 | 1 |
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| September | 1 | 1 | 3 | 5 | 8 | 9 | 10 | 9 | 6 | 4 | 2 | 1 | 1 |
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| October | 1 | 1 | 2 | 4 | 6 | 7 | 7 | 6 | 4 | 2 | 1 | 1 | 0 |
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| November | 1 | 1 | 3 | 4 | 5 | 5 | 5 | 4 | 3 | 1 | 1 | 0 | 0 |
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| December | 1 | 1 | 2 | 3 | 4 | 4 | 3 | 2 | 1 | 1 | 0 | 0 | 0 |
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Compare Altadena UV Index to other United States cities
Altadena's solar exposure compared to other cities in United States. Generated using Copernicus Atmosphere Monitoring Service information.| | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
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| Chicago | 3 | 4 | 6 | 8 | 9 | 10 | 10 | 9 | 8 | 6 | 4 | 2 |
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| Brooklyn | 3 | 5 | 6 | 8 | 10 | 10 | 9 | 9 | 8 | 6 | 4 | 2 |
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| New York City | 3 | 5 | 6 | 8 | 10 | 10 | 9 | 9 | 8 | 6 | 4 | 2 |
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| Los Angeles | 4 | 6 | 8 | 9 | 10 | 11 | 11 | 10 | 10 | 7 | 5 | 4 |
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| Altadena | 4 | 6 | 8 | 10 | 11 | 11 | 12 | 11 | 10 | 7 | 5 | 4 |
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| Houston | 5 | 8 | 9 | 11 | 11 | 12 | 12 | 11 | 10 | 9 | 7 | 5 |
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Compare Altadena's UV Index to other cities in the world
Altadena's solar exposure compared to other cities in the world. Generated using Copernicus Atmosphere Monitoring Service information.| | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
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| Oslo | 1 | 2 | 3 | 4 | 5 | 7 | 7 | 5 | 4 | 2 | 1 | 1 |
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| Berlin | 1 | 2 | 4 | 5 | 7 | 8 | 7 | 7 | 5 | 3 | 2 | 1 |
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| London | 1 | 2 | 4 | 5 | 7 | 8 | 8 | 7 | 6 | 4 | 2 | 1 |
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| Toronto | 2 | 4 | 5 | 8 | 9 | 9 | 9 | 9 | 7 | 5 | 3 | 2 |
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| New York City | 3 | 5 | 6 | 8 | 10 | 10 | 9 | 9 | 8 | 6 | 4 | 2 |
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| Athens | 3 | 4 | 6 | 8 | 10 | 10 | 10 | 10 | 8 | 7 | 4 | 3 |
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| Tokyo | 3 | 5 | 8 | 9 | 11 | 11 | 11 | 11 | 10 | 7 | 5 | 4 |
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| Los Angeles | 4 | 6 | 8 | 9 | 10 | 11 | 11 | 10 | 10 | 7 | 5 | 4 |
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| Altadena | 4 | 6 | 8 | 10 | 11 | 11 | 12 | 11 | 10 | 7 | 5 | 4 |
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| Shanghai | 5 | 6 | 8 | 10 | 10 | 11 | 12 | 11 | 11 | 8 | 6 | 4 |
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| Auckland | 14 | 14 | 10 | 7 | 4 | 3 | 3 | 5 | 7 | 10 | 11 | 13 |
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| Dubai | 6 | 7 | 11 | 11 | 12 | 11 | 10 | 11 | 10 | 8 | 6 | 5 |
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| Sydney | 14 | 13 | 11 | 8 | 5 | 3 | 4 | 6 | 8 | 10 | 12 | 14 |
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| Miami | 6 | 9 | 10 | 12 | 12 | 13 | 12 | 12 | 11 | 10 | 8 | 6 |
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| Mexico City | 10 | 12 | 14 | 15 | 15 | 14 | 14 | 13 | 14 | 12 | 10 | 8 |
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| Jakarta | 14 | 16 | 16 | 14 | 11 | 10 | 10 | 11 | 13 | 15 | 14 | 13 |
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