Wednesday, December 14, 2011

Record Daily Rainfall Pushes Chicago Toward 2nd Wettest Year

December 15 Update: Yesterday's final rainfall total of 1.43" exceeded the old daily record at Chicago by over 40%. The monthly total to date, including an additional 0.02" today, brings the annual amount to 49.20", only 0.15" below the second highest on record.

Original post:
Today's heavy rainfall at Chicago set a daily record for December 14 and pushed the annual total closer to the second wettest year in 140 years of records. The 1.13" reported in the preliminary daily summary as of 4 pm CST exceeded the 0.99" first observed in 1907 and tied in 1975. The year to date total of 48.88" is 36% above the normal amount of 35.83". This is the third highest annual total, behind:
1) 2008   50.86"   
2) 1983 49.35"
The 1.35" at Peoria also exceeded the daily record of 1.14" in 1975. The year to date total there of 39.12", however, is behind the 41.29" last year.

The 0.5" of snow so far this month at Chicago is well below the average amount of 3.3". Last year at this time, the monthly total was 6.9". Temperatures so far in December have averaged 4.2° above normal.

Seasonal Outlook

Latest seasonal forecast: Click here.

Latest 3-month temperature outlook from Climate Prediction Center/NWS/NOAA.