Dry in Western IL, Could Change This Weekend

Much of western and southern Illinois has been dry in June. In the first map below, areas in the darker shades of orange are 2 to 4 inches below normal on rainfall for the month. Meanwhile, areas in eastern-central and northern Illinois have been near to above normal. A few areas have been downright wet (shaded in blue). Temperatures have been running 4 to 5 degrees above normal.

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New Outlook for Summer, Hot in Illinois

The new NOAA Climate Prediction Center outlook was released. Illinois has an increased chance of being warmer than average for July and for the July-September period. So far June has been warm with temperatures running 3.5 degrees above normal. There are no indications of how precipitation will behave in July and July-September. I’m most concerned with the dryness in western Illinois. Continue reading

Parts of Illinois Abnormally Dry

The US Drought Monitor has declared nearly 36 percent of Illinois to be “abnormally dry”. This is the first stage before drought is declared. Other areas that are in the same conditions are Marshall, Woodford, and western McLean Counties in the western region and probably not so much in Grundy, Livingston, and Ford Counties (especially when you look at the 90-day precipitation deficits). We can pass along impacts to the Drought Monitor, so please send me any observations that you have. Thank you. Continue reading

Dry Across Illinois and Corn Belt Last 30 Days

It has been dry across Illinois and most of the Corn Belt in the last 30 days. Below-normal precipitation has occurred from the eastern Dakotas, Nebraska, through parts of Minnesota, Iowa, and Missouri, and across much of Illinois, Indiana, Kentucky, Ohio, and Michigan.

For Illinois, temperatures were close to normal in the second half of May. However, temperatures for the first 12 days of June have been running 2.7 degrees above normal. Meanwhile, the statewide average precipitation for June so far is 1.52 inches, which is 0.7 inches below normal.

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Spring in Illinois, Warm with Wet and Dry Patches

Climatological spring is defined as March, April, and May. Here are how things looked this Spring for precipitation and temperatures. For most of Illinois, precipitation in Spring was close to the 1981-2010 average (normal) with some wet areas in northeast and southern Illinois. Temperatures ended up on the warm side for Spring.

map1
The accumulated precipitation in spring, ranging from 15-20 inches far southern Illinois, to only 5-7.5 inches in small patches near the Illinois River. Most of the state was either 10-15 inches (dark green) or 7.5 to 10 inches (medium green).
map2
The Spring precipitation departures from normal show wet and dry areas of the state. Areas in southern and northeast Illinois were wetter with with amounts 2 to 6 inches above normal (darker shades of green). Areas in western Illinois were 2 to 6 inches below normal. The rest of the state was within 2 inches of normal. 
map3
The temperature departures from normal for Spring show that most of the state was running 1 to 2 degrees warmer than normal. Obviously, there were some stretches of colder than normal weather during Spring but the warmer than normal temperatures prevailed. 

Heavy Rains Strike Parts of Illinois in May

Summary: For Illinois, the statewide average temperature for May was 62.2 degrees, just 0.5 degrees below normal. Underneath the benign numbers were some stretches of cold weather at the beginning and middle of the month before summer-like conditions arrived in the last 10 days of the month.  The statewide average precipitation was 4.52 inches, just 0.08 inches below normal. However, heavy rains struck parts of Illinois, causing flooding. Some areas received up to 9-10 inches of precipitation by the end of the month.

Precipitation

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