The month of December ended up above common with respect to temperatures and under common in snowfall and precipitation. The common excessive throughout the Midwest was 39 – 44 levels with the highest max temperatures being 64 (Indianapolis). Regarding minimal temperatures, the common low was 26 – 28 levels with the coldest being 8 levels (Chicago). Even although snowfall and precipitation was under common for many, Columbus was the exception and did handle to see 8.5” of snowfall, which was 5.4″ above regular.
The begin of meteorological winter was a chilly and wintry one for Dayton, Cincinnati and Columbus. A storm system introduced with it a rain/snow combine throughout the morning of November thirtieth. The combine modified to a light-weight / average snow that continued by the remainder of the day and into the afternoon of December 1st earlier than ending. Overall, 2 – 4” of snow fell throughout the three cities and surrounding suburbs. After this preliminary storm, situations warmed up and stayed quiet for a number of days earlier than flurries and scattered snow showers made their approach throughout Chicago and and ultimately into Ohio. These snow showers produced a couple of coatings, however with temperatures in the higher 30s, impacts had been minimal. The climate turned quiet and heat once more between December 8 – twelfth together with temperatures hovering into the decrease to center 60s! This was brief lived for Chicago as a chilly entrance moved by ensuing in a mixture of rain/snow. The combine ended as snow showers that produced some coatings primarily outdoors the metro space. The remainder of the Midwest noticed the identical entrance, but it surely was too heat for snow and produced durations of rain.
Cooler situations adopted after this entrance, with temperatures primarily in the 30s. Then, a sequence of disturbances pushed by the Midwest on the sixteenth and seventeenth with the brunt of impacts being in Indianapolis, Dayton, Cincinnati and Columbus. These areas obtained as much as 3” of snow in comparison with Illinois the place solely coatings occurred in and round Chicago. There was a pointy temperature gradient which resulted in a definite cutoff of snow (see image under).
The disturbances quieted down for a couple of days due to excessive strain, however our subsequent potent system pushed by between December twenty fourth and into Christmas. While it solely a produce a coating to 1” of snow and sleet in Illinois and Indiana, it dropped 3 – 4” of average to typically heavy snow in Dayton and Cincinnati. This system weakened because it headed east into Columbus and produced freezing rain, which led to coatings of ice on all surfaces. The lively sample endured into the twenty seventh with a basic coating – 0.5” throughout the Midwest from a fast transferring system. These disturbances additionally offered the area with frigid air as lows plummeted into the decrease to center teenagers throughout the day and evening! In Indianapolis, it was the sixth coldest Christmas on document and the coldest in the final 35 years! The lively sample continued by the finish of the month, with a potent winter storm on December twenty ninth by the thirtieth. While Indianapolis and Ohio noticed solely a coating – 1” of from gentle to average snow, impacts had been extra important in Chicago. The storm began off with heavy snow and temporary 1 – 2” per hr snowfall charges. These charges tapered to a light-weight snow and sleet combine earlier than ultimately turning into freezing rain by the morning of December thirtieth. Most areas noticed 2 – 4” of snow with as much as 0.10” of ice, which led to a number of visitors accidents and energy outages. This allowed the final month of 2020 to finish on a snowy and icy be aware.