Olney Weather Records

Olney, Illinois weather averages and records from 1893–2024 based on data made available by the NOAA.
All-Time Recorded High
The highest temperature ever recorded in Olney, Illinois was 112 °F which occurred on July 15, 1936.
Highest Temperatures: All-Time By Year
All-Time Recorded Low
The lowest temperature ever recorded in Olney, Illinois was -25 °F which occurred on February 2, 1951.
Lowest Temperatures: All-Time By Year
Olney Weather by Month
Averages based on the years 1991–2020
Month Average (°F) Record (°F) Average (inches)
High ☀️ Low 🌙 High ☀️ Low 🌙 Precipitation 💧 Snow ❄️
January 38.2 21.5 75 -24 3.4 4.3
February 43.7 25.2 78 -25 2.5 2.3
March 54.1 33.4 89 -15 4.2 1.3
April 66.3 43.6 91 21 5.0 0.0
May 75.8 54.1 98 29 5.6 0.0
June 84.6 62.9 106 36 4.8 0.0
July 87.4 66.2 112 45 4.8 0.0
August 86.4 64.1 109 41 3.0 0.0
September 81.0 56.5 106 27 3.3 0.0
October 69.0 45.1 97 17 3.7 0.0
November 54.4 34.3 83 -2 4.2 0.5
December 42.8 26.4 74 -19 3.5 3.5
Entire year 65.3 44.5 112 -25 47.7 11.6
More Olney Weather Records
1893–2024
Highest daily low 83 °F June 29, 1952
Lowest daily high -4 °F January 7, 2014
Greatest daily range
(Difference of high and low)
62 °F January 13, 1916
Greatest difference in daily high
over two conscutive days
52 °F Feb 1–2, 1917
Most daily precipitation 6.4 inches September 3, 1926
Most monthly precipitation 13.3 inches April 2011
Most yearly precipitation 66.9 inches 2011
Most yearly days with precipitation 141 1985
Earliest snow in season October 23 1917
Latest snow in season April 24 1910
Most daily snow 12.0 inches January 15, 1918
Most monthly snow 24.5 inches January 1918
Most yearly snow 42.5 inches 1899
Most snow in a winter 38.3 inches 1895–1896
Greatest snow accumulation 20.0 inches January 15, 1918
Earliest freeze September 24 1928
Earliest day ≥ 90 °F April 11 1930
Earliest day ≥ 100 °F June 11 1914
Latest freeze May 10 2020
Latest day ≥ 90 °F October 22 1953
Latest day ≥ 100 °F September 29 1953
Most days in a year < 0 °F 17 1977
Most days in a year < 32 °F 132 2013
Most days in a year ≥ 80 °F 152 2007
Most days in a year ≥ 90 °F 94 1936
Most days in a year ≥ 100 °F 39 1936
Most days in a year ≥ 110 °F 4 1936
Olney Weather Streaks
Most consecutive days...
With precipitation 13 days Sep 23 – Oct 5, 1926
Without precipitation 42 days Aug 11 – Sep 21, 1955
With snow 6 days Jan 25–30, 2009
High temperature at or
below freezing
19 days Jan 5–23, 1977
High temperature ≥ 80 °F 105 days May 23 – Sep 4, 2010
High temperature ≥ 90 °F 26 days Jul 22 – Aug 16, 1944
High temperature ≥ 100 °F 14 days Aug 15–28, 1936
Plant Hardiness Zone
6B
Olney is in plant hardiness zone 6B
based on average yearly minimum temperature from 1991–2020
Olney Weather by Year
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Weather Station Details
Years Station Coordinates
1893–2024 Olney 2S location