Tag Archives: October

A Very Warm October in Illinois

[Edited on October 26 to reflect update] Based on data through October 25, the statewide average temperature for Illinois in October is 60.7 degrees. That is 6.3 degrees above normal and the fourth warmest October on record. Temperatures for the rest of October are expected to be 3 to 5 degrees above normal. Therefore, this October could slip in the polls. Here are the top ten warmest Octobers

  1. 1963 with 63.6°F
  2. 1947 with 62.2°F
  3. 1971 with 61.3°F
  4. 2016 with 60.7°F
  5. 1900 with 60.6°F
  6. 1956 with 60.2°F
  7. 2007 with 59.9°F
  8. 1897 with 59.7°F
  9. 1950 with 59.3°F
  10. 1920 with 59.2°F

Here are the U.S. temperature departures for October so far . Illinois and the eastern two-thirds of the U.S. are experiencing above-normal temperatures (shown  in various shades of pumpkin spice, appropriately enough). Speaking of pumpkins, the harvest for this year looks much better than last year.

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October Warmer and Drier than Average in Illinois

October ended up warmer and drier than average in Illinois. The statewide average temperature was 55.8 degrees, 1.7 degrees above average.

The statewide average precipitation was 1.47 inches, 1.79 inches below average and the 22nd driest October on record. Even so, there were a few areas on the border with Iowa and Kentucky that received 2 to 3 inches of precipitation (dark blue in map below). The two largest monthly totals came from Stockton IL (COOP) and Orion IL (IL-HY-1), both reporting totals of 3.47 inches of precipitation.

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The outlook for November, according to the National Weather Service, shows an increased chance for above-average temperatures across Illinois and the Midwest. The outlook shows an increased for above-average precipitation for the southern two-thirds of Illinois. This is part of broad area of expected wetter conditions across the southern US. Meanwhile, the northern third of Illinois has equal chances (EC) for above, below, and near-average precipitation.  Click on the maps to enlarge.

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Rain At Last in Illinois

Here is the rainfall map for the past 7 days. Most of the rain in Illinois has come in the last 2 days of that mapping period. In fact, almost all the rain in October for Illinois has fallen in the last 2 days.

Most of Illinois was in the two lighter shades of green, indicating rainfall amount of between 0.5 and 1.5 inches. There is a hole in southwestern Illinois (blue) were rainfall amounts were less than 0.5 inches. Higher amounts of 2 or more inches just missed Illinois, and fell across the border in Kentucky and southern Indiana.

It looks like we have one last shot of rain in October on Saturday.

Click to enlarge.

Click to enlarge.

Second Driest October on Record for Illinois, But Not for Long

As of this morning, the statewide average precipitation in Illinois was 0.34 inches. That makes it the second driest October on record. However, the forecast for Tuesday will move us down in the rankings. In the meantime, here is where we stand for dry Octobers:

Rank Year Amount Departure Percent of Average
1 1964 0.18 -3.06 6%
2 2015 0.34 -2.90 11%
3 1897 0.46 -2.78 14%
4 1908 0.50 -2.78 15%
5 1895 0.60 -2.64 19%
6 1952 0.67 -2.57 21%
7 1904 0.71 -2.53 22%
8 1956 0.72 -2.52 22%
9 1915 0.83 -2.41 26%
10 1963 0.93 -2.31 29%

October Warm and Dry So Far in Illinois

October has been both warmer and drier than average so far for Illinois.

Temperatures have run 1 to 2 degrees above average in Illinois and across most of the Midwest (first map). This follows close on the heels of a September that is now considered the 8th warmest on record at 70.4 degrees according to NCEI.

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Meanwhile, precipitation has been largely missing in action in October (map below). The areas in gray across Iowa, and parts of surrounding states indicate almost no measurable precipitation has fallen. It’s hard to tell on this map because of the scale, but most of Illinois has received less a tenth of an inch for the month so far. The statewide average is 0.05 inches.   Continue reading