[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
1963 with 63.6°F
1947 with 62.2°F
1971 with 61.3°F
2016 with 60.7°F
1900 with 60.6°F
1956 with 60.2°F
2007 with 59.9°F
1897 with 59.7°F
1950 with 59.3°F
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.
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.
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.
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.
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:
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.
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 “October Warm and Dry So Far in Illinois”
The NWS Climate Prediction Center released their latest outlook for October and beyond. It looks like the warm-than-average weather is expected to continue for the next several months. The primary driver in the forecast is the ongoing El Niño in the Pacific Ocean basin.
Illinois has an increased chance of above-average temperatures for October. There is not much to report on precipitation in Illinois. We are between drier-than-average conditions to our northeast and wetter-than-average conditions to our southwest.
Based on preliminary numbers*, the statewide average precipitation for October in Illinois was 4.5 inches, which is 1.2 inches above average. It was the 15th wettest October since 1895. The wettest October on record for the state was 1941 with 9.06 inches of precipitation.
The largest precipitation totals were in the central third of the state where 6 to 8 inches were common. Greenfield had an incredible 9.94 inches of precipitation. Medora, Girard, and Carlinville also reported over 9 inches of precipitation. Precipitation totals were more moderate elsewhere; 4 to 6 inches in southern Illinois and 2 to 4 inches in northern Illinois. Also, several locations in northeast Illinois reported seeing traces of snow for the month.
The statewide average temperature was 54.0 degrees, 0.1 degrees below average.
*I updated these numbers on November 2 with only a 0.2 degree change in temperature from 54.2 to 54.0 degrees.
MAPS AND PLOTS FOR OCTOBER
The plot of past October precipitation for Illinois (below) shows that things have become slightly wetter over time, about 0.64 inches in the last century. The outstanding October’s of 1941 and 2009 are easily seen as well.
The statewide average temperature for October so far in Illinois is 56.5 degrees, 1.4 degrees below average. The statewide average precipitation for October so far is 2.5 inches.
Here is the map showing how the precipitation has fallen in Illinois and surrounding states. The heaviest amounts in Illinois were the 3 to 5 inches between Interstates 70 and 74. Amounts of 1 to 3 inches were common in the northern and southern thirds of the state. The largest total so far is 8.38 inches reported at Greenfield in Greene County
October 2012 was cooler and wetter than normal in Illinois. The statewide average precipitation was 3.94 inches, 0.68 inches above normal. The wettest area of the state was between Quincy and Champaign where precipitation totals ranged from 4 to 7 inches. Some of the driest areas were in southern Illinois south of I-64 and in northern Illinois north of I-80. Some of that area had precipitation totals of less than 3 inches. See map below.
The statewide average temperature was 52.2 degrees, 1.9 degrees below normal. Most of the state reached lows of 32 degrees, and much of central and northern Illinois were down to 28 degrees, signalling the end of the growing season for most outdoor plants.
Year to Date
The statewide average precipitation for January-October was 27.1 inches, nearly 5.8 inches below average. This made it the 15th driest January-October and virtually tied with 2005. The driest was in 1901 with 21.99 inches. The second driest was 1988 with 22.10 inches.
The statewide average temperature was 58.9 degrees, 3.4 degrees above normal. That made it the second warmest on record. The warmest was 1921 with 59.2 degrees.
**All temperature and precipitation amounts are preliminary and may change as more data arrives.
The statewide average precipitation for October in Illinois was 1.79 inches, 1.12 inches below average or 61 percent of average. That makes it the 21st driest October on record back to 1895. See map below.
Amounts of less than an inch were common in western Illinois. The driest spot for October in Illinois was Colchester (near Macomb) with 0.22 inches for the month. The wettest spot in Illinois was Lansing (south Chicago) with 5.22 inches.
Moderate to severe drought remains in western Illinois, according to the U.S. Drought Monitor. The National Weather Service has predicted above-average precipitation for November across Illinois. Combined with cooler temperatures, this should lead to improvements in that area of the state.
The statewide average temperature for October in Illinois was 55.1 degrees, just 0.5 degrees above average. The highest temperature for October in Illinois was 92 degrees at Bentley on October 8. The lowest temperature was 23 degrees at Mt. Carroll on October 29. Most of Illinois experienced temperatures at or below freezing by the end of the month.
No measurable snow reported yet. I’m sure that will change in November.