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Illinois averages around 50 days of thunderstorm activity a year which put it somewhat above average for number of thunderstorm days for the United States. Illinois is vulnerable to tornadoes with an average of 54 occurring annually, which puts much of the state at around 9.7 tornadoes per 10,000 square miles (30,000 km 2 ) annually.
Official monthly mean temperatures have ranged from 10.1 °F (−12.2 °C) in January 1977 to 81.3 °F (27.4 °C) in July 1955, both recorded at Midway, [18] while the annual mean temperature has ranged from 45.1 °F (7.3 °C) in 1875, as recorded at the Roanoke Building, to 54.5 °F (12.5 °C), as recorded at O'Hare. [18]
The maps are derived from U.S. climate normals provided by the National Centers for Environment Information (NCEI): The dataset consists of the latest 30-year average of weather data, including ...
Here’s how the Farmers’ Almanac summer forecast compares to monthly averages from the National Weather Service.
The Cashe River area in southern Illinois forms the basis for a ... Average annual temperature is 47 °F. in the north and 58 °F. in the south. ... 0.2 1.6 6.3 28.2 ...
Today, the most commonly used climate map is the Köppen climate classification, developed by Russian climatologist of German descent and amateur botanist Wladimir Köppen (1846–1940), which divides the world into five major climate regions, based on average annual precipitation, average monthly precipitation, and average monthly temperature.
In recent years, average temperatures in the county seat of Lincoln have ranged from a low of 15 °F (−9.4 °C) in January to a high of 86 °F (30 °C) in July, although a record low of −29 °F (−33.9 °C) was recorded in December 1914 and a record high of 113 °F (45 °C) was recorded in July 1936.
According to the US Census Bureau, the county has a total area of 883 square miles (2,290 km 2), of which 866 square miles (2,240 km 2) is land and 17 square miles (44 km 2) (1.9%) is water. [5] Fulton County is the site of Dickson Mounds Museum, a state museum of Native American daily life in the Illinois River valley.