Most Monthly Precipitation in Olney History

This is a list of the largest monthly precipitation totals ever recorded in Olney, Illinois history from 1893–2024.

What Was the Wettest Month in Olney History?

According to NOAA records, the most precipitation that Olney, Illinois has ever received in a single month is 13.3 inches which occurred in April 2011.

Month to date though April 26, 2024: 7.3 inches

Olney Most Rain in One Month

Rank	Precipitation	Month
1	13.3 inches	April 2011
2	12.8 inches	May 1943
3	12.7 inches	March 2008
4	12.3 inches	October 1919
5	12.3 inches	May 1961
6	12.2 inches	September 1911
7	12.2 inches	November 1985
8	12.0 inches	March 1945
9	12.0 inches	January 1950
10	11.8 inches	March 1897
11	11.7 inches	July 1958
12	11.5 inches	July 2022
13	11.2 inches	August 2000
14	11.2 inches	May 1995
15	11.1 inches	June 2015
16	11.0 inches	September 1926
17	11.0 inches	March 1898
18	11.0 inches	May 1996
19	10.9 inches	January 1937
20	10.8 inches	May 2009