1. Historical thawed depth (depth of surface frost thawed) data (2004-2024): click here to download zipped .csv ; Links to some additional resources: Freeze Date Tool (Midwest Regional Climate Center (MRCC)) Winter Severity and Frost Depth in a Warming Climate About AFI - Air Freezing Index (NCDC) NCRFC soil temperature page and dashboard:
  2. stateclimatologist.web.illinois.edu

    Check with University of Illinois Extension for suggestions on dealing with frost. Illinois Growing Season. The 1991-2020 average length of the growing season varies from 215 days in far southern Illinois to 180 days in far northern Illinois. Of course, the actual length can vary from year to year.
  3. stateclimatologist.web.illinois.edu

    They noted frost depth, soil moisture, soil texture, ground cover, and exposure. The deepest observed frost depths during this period ranged from 5 inches in far southern Illinois to 30 inches in far northern Illinois. The results were published in the Transactions of the Illinois State Academy of Science (pdf).
  4. stateclimatologist.web.illinois.edu

    The preliminary statewide average September temperature was 66.8 degrees, 0.6 degrees above the 1991-2020 average and the 57 th warmest on record going back to 1895. The preliminary statewide average total September precipitation was 2.66 inches, 0.53 inches below the 1991-2020 average and the 41 st driest on record statewide.. Data are provisional and may change slightly over time.
  5. nimblefreelancer.com

    The Frost line is a geographical term referred to as frost depth. This word refers to the level or depth of groundwater at which the water starts to freeze. ... Minnesota has a frost line of 80 inches, and North Dakota follows it with 75 inches. The external frost line includes states like Florida and Hawaii that display 0 inches of frost lines ...
  6. go.illinois.edu

    Illinois Frost Dates and Growing Season Dr. Jim Angel, State Climatologist. Frost is the formation of thin ice crystals on the ground or other surfaces in the form of scales, needles, feathers, or fans. If a frost period is severe enough to end the growing season or delay its beginning, it is referred to as a "killing frost".
  7. worldpopulationreview.com

    Generally, the coldest U.S. states have the deepest frost lines. Alaska's is the deepest at 100 inches, ... For example, frost depths in Illinois range from approximately 20" in the south to more than 50" along the northern border, which results in an average of 36" for the state as a whole.
  8. datapandas.org

    The coldest states, including Alaska, Minnesota, and North Dakota, have the deepest frost lines amongst all states. For instance, Alaska leads with an impressive 100-inch frost line depth, followed by Minnesota at 80 inches and North Dakota at 75 inches. Conversely, states with traditionally warmer climates tend to have shallower frost lines.
  9. stateclimatologist.web.illinois.edu

    Illinois Water Table Levels; Illinois Climate Normals; Northeast Illinois Rainfall Trends; ... Frost in Illinois. ... Illinois State Climatologist. Illinois State Water Survey 2204 Griffith Drive, Champaign, IL 61820 217-244-1330. Search for: Search
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