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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]
Total area is 57,918 square miles (150,010 km 2), ranked 25th in size of the 50 states. Water area is 2,325 square miles (6,020 km 2); Lake Michigan accounts for most of this. Charles Mound in the northwest Driftless Area is the highest point in the state at 1,235 feet (376 m) above sea level.
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 ...
The normal high temperature in July is 90 °F (32 °C), and the normal low temperature in January is 19 °F (−7 °C), although this varies from year to year. Both 100 and 0 °F (37.8 and −17.8 °C) temperatures can be seen on an average 2 or 3 days per year.
Here’s how the Farmers’ Almanac summer forecast compares to monthly averages from the National Weather Service.
According to the U.S. Census Bureau, the county has a total area of 387 square miles (1,000 km 2), of which 380 square miles (980 km 2) is land and 7.0 square miles (18 km 2) (1.8%) is water. [ 3 ] The Saline County area is mostly rolling hills throughout gradually rising to the Hills of the Shawnee National Forest .
Columbus, Ohio has a humid continental (Köppen climate classification Dfa) climate, characterized by humid, hot summers and cold winters, with no dry season.The Dfa climate has average temperatures above 22 °C (72 °F) during the warmest months, with at least four months averaging above 10 °C (50 °F), and below 0 °C (32 °F) during the coldest.