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However, Illinois did not officially recognize this measurement, as it was made from a small airport and there were no quality control procedures applied to the measurement. [10] As a result, the official record-lowest temperature for the state was −36 °F (−37.8 °C) recorded at Congerville on 5 January 1999. [ 11 ]
The weather associated with an occluded front includes a variety of cloud and precipitation patterns, including dry slots and banded precipitation. Cold, warm and occluded fronts often meet at the point of occlusion or triple point. [28] A guide to the symbols for weather fronts that may be found on a weather map: 1. cold front 2. warm front
Warm fronts are at the leading edge of a homogeneous advancing warm air mass, which is located on the equatorward edge of the gradient in isotherms, and lie within broader troughs of low pressure than cold fronts. A warm front moves more slowly than the cold front which usually follows because cold air is denser and harder to lift from the ...
Illinois has a continental climate, with large temperature extremes not moderated by either mountains or oceans. Weather is influenced primarily by cold Canadian Arctic air in the winter, and warm, humid air from the Gulf of Mexico in the summer. High temperatures in the south of the state are about 10 to 12 °F. warmer than the north.
Such maps have been in use since the mid-19th century and are used for research and weather forecasting purposes. Maps using isotherms show temperature gradients, [2] which can help locate weather fronts. Isotach maps, analyzing lines of equal wind speed, [3] on a constant pressure surface of 300 or 250 hPa show where the jet stream is located.
A statement accompanying the forecast adds, “After a weird and warm winter season last year, this winter should make cold weather fans rejoice — especially those in the Great Lakes, Midwest ...
Highs reach 50 °F (10 °C) an average of 8.8 days each winter from December to February at Midway. Based on 30-year averages obtained from NOAA's National Climatic Data Center for the months of December, January and February, The Weather Channel ranked Chicago the sixth-coldest major U.S. city as of 2014. [31]
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