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In Alaska, winter's chill comes early as Fairbanks records fourth-coldest October

The colder weather froze Interior lakes quicker and deeper than usual, but rivers are still in the process of freezing solid, said Larry Rundquist at the National River Forecast Center in Anchorage.

The ice on the Yukon River has stopped moving in several Interior villages, including Circle, Galena, Tanana and Nulato, Rundquist reported. The ice on the Tanana River at Manley stopped running on Oct. 23, he said.

The early part of winter has been much colder this year than normal in terms of “freezing degree days,” which Rundquist said are the driver for freeze-up and ice thickness. Freezing degree days are accumulated when the average daily temperature drops below 32 degrees. One freezing degree day is the equivalent of one degree below freezing. For example, if the average daily temperature is 22 degrees, it equals 10 freezing degree days.