Illinois State Water Survey Illinois State Climatologist

August Near-Normal But Summer Hot, Dry for Illinois

August After months of exceptionally warm temperatures and drought, Illinois finally experienced temperatures and precipitation closer to normal in August. The statewide average temperature for August was 73.5 degrees, just 0.1 degree below normal. That’s about as “normal” as you can get. The statewide average precipitation for August was 3.4 inches, which is 95 percent […]

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Latest Seasonal Outlook

NOAA’s Climate Prediction Center released their June and June-August outlook yesterday (figure below). On the left hand side of the figure, they have far southern Illinois with an increased chance of above normal temperatures for June. For June-August, that area of increased chances expands and covers an area roughly south of I-70.  The rest of the […]

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Summer – One of the Warmest and Wettest on Record

Summer This summer was one of the warmest and wettest in Illinois history, based on preliminary data. The average statewide temperature for this summer (June-August) was 76.4 degrees, 2.7 degrees above normal and the seventh warmest summer on record. The average statewide rainfall was 16.7 inches, 5.2 inches above normal and the sixth wettest summer on record. […]

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Dry Weather in Southern and East-Central Illinois

60-day rainfall departure

After a wet start to the 2010 growing season, two areas of dryness have persisted in the last 60 days (see map below). The first area is far southern Illinois, where dry conditions extend back to June. The second, more recent area is in east-central Illinois. The hardest hit area appears to include parts of […]

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