In Dallas, Texas and across north Texas in the month of December the daily high temperatures decrease by 6°F, from 62°F to 56°F, rarely falling below 40°F or exceeding 74°F. Daily low temperatures decrease by 6°F, from 44°F to 39°F, rarely falling below 26°F or exceeding 58°F. It does get cold on occasion though, with record low temperatures at the end of the month in the single digits and even a little below zero on same days. Snowfall can reach a couple inches. Cold air is easily pushed down the plains from Canada in the winter season. Often times this cold air only manages to penetrate the lowest several thousand feet – so it is close to the ground. When this happens and storms push moisture in from the Gulf of Mexico it falls as rain – yet with temperatures near the ground below freezing the rain freezes on all surfaces and causes ice. On December 31, 1978 a severe ice storm struck leaving 1” to 2" of ice over a 100-mile swath from Gainesville to Paris, Texas. Electricity was off for 10 days in parts of Dallas County. More than 2,000 people were treated for frostbite, automobile or falling accidents.
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