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The latest plant hardiness zone map shows Illinois spanning zones 5a to 7b. The most northern zone (5a) is isolated to the very northwest corner of the state, while much of the rest of northern Illinois is in zone 5b. Most of the Chicagoland area is in zone 6a because of the combined moderating effects of Lake Michigan and urban sprawl.
1 Μαΐ 2024 · Because of its nearly 400-mile (640 km) length and mid-continental location, Illinois has a widely varying climate. Most of Illinois has a humid continental climate (Köppen climate classification Dfa) with hot, humid summers and cool to cold winters.
16 Νοε 2023 · The newest hardiness zone map is based on weather data from 1991 to 2020, and like earlier versions, is divided into 13 zones across the United States. The most obvious change between the new hardiness zone map and the 2012 map is a northward progression of zones 6a-6b and 7a (Figure 1).
Five factors control the continental climate of Illinois: 1) the sun, 2) weather systems, 3) topography, 4) urban areas, and 5) Lake Michigan. Two major controls are latitude (reflecting the amount of solar input) and weather systems (air masses and cyclonic storms).
Based on the 1990 USDA Hardiness Zone Map, this interactive version covers the state of Illinois which ranges from USDA Zone 4b to USDA Zone 6b.
Hardiness Zones, also referred to as Growing Zones or Planting zones are defined by the U.S. Department of Agriculture (USDA) Agricultural Research Service (ARS). The zones in this map were created in 2023 using mean extreme climate data covering the period of 1991 to 2020.
Climate and Average Weather Year Round in Illinois United States. We show the climate in Illinois by comparing the average weather in 3 representative places: Chicago, Springfield, and Carbondale. You can add or remove cities to customize the report to your liking. See all locations in Illinois.
