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'Twas the Day After Christmas And All Through the Valley: Dense Fog and Bone-Chilling Temps


More than a few Idahoans reached for their new Christmas sweaters Saturday morning as a big chill settled into the Gem State, meaning 2015 will be ending very much like it began (New Year's Day 2015 was 6 degrees in Boise).

Sun Valley registered single digits before sunrise on Saturday while McCall dipped below zero, and residents in the Custer County community of Stanley woke up to a temperature of 15-below.

Meanwhile, the National Weather Service Office in Boise issued a dense fog advisory, in effect until 11 a.m. Saturday morning, for the lower and upper Treasure Valley  and the Upper Weiser River Basin. Visibility was less than one-quarter of a mile in some areas and freezing fog and black ice was reported on roadways across the region.

Patchy fog is expected to hang around in the Treasure Valley until Monday, December 28 and the cold should hold its grip through the coming week with high temperatures never getting above freezing in the Treasure Valley and dipping to the single digits in mountain communities. Boise's New Year's Eve forecast calls for an overnight low near 10 degrees and a daytime high of 24 degrees.

Boise's coldest New Year's Day on record was back in 1942 when it was 13-below zero. The warmest was 1939 when Boise registered 61 degrees. 

The NWS national weather map includes a little bit of everything with more rain pounding the Seattle area, heavy snow at the Texas, New Mexico border, thunderstorms in New Orleans, rain in the mid-Atlantic and flash flooding in a corridor from Texas stretching all the way to western New York.

  • National Weather Service, Dec. 26 a.m.