Olney city, Illinois

Official LSAD Designation: Olney city • Census GEOID: 1755912 • Richland County

Climate Normals & Weather Observations

30-year climate normals (1991–2020) and weather observations for Olney city.

Reference Weather Station: OLNEY 2S, IL US (ID: USC00116446) • Located 1.9 miles from community center • Elevation: 139.9 m

Month	Average High (°F)	Average Low (°F)	Mean Temp (°F)	Precipitation (in)
January	37.8°	20.8°	29.3°	3.52"
February	42.7°	23.9°	33.3°	2.57"
March	53.4°	32.3°	42.9°	4.21"
April	65.6°	42.7°	54.2°	5.02"
May	75.1°	53.3°	64.2°	5.60"
June	84.1°	62.4°	73.2°	4.79"
July	86.8°	65.6°	76.2°	4.96"
August	85.8°	63.8°	74.8°	3.19"
September	80.4°	55.8°	68.1°	3.31"
October	68.5°	44.3°	56.4°	3.83"
November	53.9°	33.5°	43.7°	4.26"
December	42.3°	25.7°	34.0°	3.50"

2010–2025, completed calendar years only.

NOAA station OLNEY 2S, IL US (ID: USC00116446) • 1.9 miles from community center .

This is the same reference station used for monthly normals.

Show annual mean of daily highs and lows

Annual mean Annual mean of daily highs Annual mean of daily lows

Annual temperature data table (°F)

Annual station temperatures, 2010–2025. Unavailable means no reported value.
Year	Annual mean (°F)	Annual mean of daily highs (°F)	Annual mean of daily lows (°F)
2010	54.5	65.5	43.6
2011	55.5	65.6	45.3
2012	57.7	69.8	45.7
2013	52.7	63.1	42.4
2014	51.2	61.8	40.7
2015	Unavailable	Unavailable	Unavailable
2016	Unavailable	Unavailable	Unavailable
2017	Unavailable	Unavailable	Unavailable
2018	54.6	64.7	44.6
2019	54.4	64.7	44.1
2020	54.8	65.1	44.5
2021	55.5	65.9	45.1
2022	54.2	65.0	43.3
2023	56.2	67.5	45.0
2024	56.9	67.6	46.1
2025	55.5	65.9	45.1

Source: NOAA NCEI 1991–2020 U.S. Climate Normals, National Weather Service.