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North America


Great Falls Great Falls Havre Havre Billings Billings Helena Helena Glasgow Glasgow Dillon Dillon Missoula Missoula Kalispell Kalispell Miles Miles Sheridan Sheridan Sidney Sidney Glasgow Glasgow Lewistown Lewistown West Yellowstone West Yellowstone uv index Montana North America Forecast maps
Last updated: Tu, 26 Oct, 08:06 BST

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.