World
North America
Helena UV index
| Local Time | Th Jan 16 | Fr Jan 17 | Sa Jan 18 | Su Jan 19 |
| UV index | 2 | 1 | 1 | 1 |
The strength of the sun's ultraviolet (UV) radiation is expressed as a Solar UV Index or Sun Index.The UV Index does not exceed 8 in the UK (8 is rare; 7 may occur on exceptional days, mostly in the two weeks around the summer solstice). Indices of 9 and 10 are common in the Mediterranean area. The Sun Index forecast refers to the daily maximum. |
Last updated: Th, 16 Jan, 18:13 GMT
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