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Average yearly precipitation for Illinois varies from 48 inches or 1,220 mm at the southern tip to 35 inches or 890 mm in the northern portion of the state. Normal annual snowfall exceeds 38 inches or 0.97 m in Chicago , while the southern portion of the state normally receives less than 14 inches or 0.36 m. [ 1 ]
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In Boston, The Old Farmer's Almanac states that the average first frost usually falls around Nov. 3. In more inland parts of the state, the first frost often comes sooner.
Winter temperatures are generally cold. However, like much of the northern USA, can vary tremendously within the span of one week. The daily average high temperature in January at O'Hare is 31.0 °F (−0.6 °C) with the average daily low of 16.5 °F (−8.6 °C) and the daily mean of 23.6 °F (−4.7 °C).
Here's when Milwaukee has historically recorded its first frost, according to NWS: Average first frost: Oct. 22. Earliest first frost recorded: Sept. 20, 1966. Latest first frost recorded: Nov. 24 ...
That was the latest date of ice on the Great Lakes ever. [102] The average temperature for the contiguous U.S. during the winter season was 31.3 °F (−0.4 °C), one degree below the 20th-century average, and the number of daily record-low temperatures outnumbered the number of record-high temperatures nationally in early 2014. [100]
Those gardening in horticultural zones higher than 9 can ignore this advice, as the southernmost parts of the continental U.S., as well as Puerto Rico and Hawaii, are considered frost-free (there ...
The red dotted-to-solid line depicts the average temperature profile with depth of soil in a permafrost region. The trumpet-shaped lines at the top show seasonal maximum and minimum temperatures in the "active layer", which commences at the depth where the maximum annual temperature intersects 0 °C. The active layer is seasonally frozen.