normals every 10 years in keeping with the needs of our user community and the requirements of the World Meteorological Organization (WMO) and National Weather Service (NWS). The official normals are calculated for a uniform 30 year period, and consist of annual/seasonal, monthly, daily, and hourly averages and statistics of temperature, precipitation, and other climatological variables from almost 15,000 U.S. Normals act both as a ruler to compare today’s weather and tomorrow’s forecast, and as a predictor of conditions in the near future. Climate Normals are a large suite of data products that provide information about typical climate conditions for thousands of locations across the United States. September 18, 2022: Hail to the size of ping pong balls in Geneva and St.The U.S.September 20, 2022: Scattered thunderstorm wind damage from Beloit to the western Chicago suburbs.November 5, 2022: Damaging winds sweep across northern Illinois and northwest Indiana.December 22-23, 2022: Powerful Arctic front brings blizzard-like conditions and bitterly cold temperatures.January 3, 2023: Rare January tornado near Gibson City, IL.January 28-29, 2023: Heavy snowfall in far northern Illinois nighttime freezing rain elsewhere.February 22-23, 2023: Ice storm across portions of northern Illinois heavy rainfall farther south.February 27, 2023: Rare February tornadoes in northern and central Illinois.2022-2023 Winter: Mild and wet with a few heavy snowfall events in far northern Illinois.March 3, 2023: Thundersnow brings quick accumulations and strong winds south of I-80.March 9-10, 2023: Winter storm produces up to over 9 inches of heavy wet snow in far northern Illinois.
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