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Olney weather in numbers
from 30 years of measured normals
Olney swings 61°F across the year, from 86°F highs in June to 25°F lows in January, and May is usually the wettest month in a year that brings about 46 in of precipitation.
Warmest month
June
86°F average high
Coldest month
January
25°F average low
Wettest month
May
46 in a year
Below freezing
3 months
January, February and December
Comfortable
3 months
April, September and October
Residents
9,005
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The weather map: all three models at once
NWS, American, European side by side around Olney and nearby towns.Live rain radar →
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Olney hourly forecast: next 14 hours
consensus of the three models
Rain in the next 24 hours, model by model
each model's own hourly precipitation, side by side
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Olney 10-day forecast, out to 14 days
where the models agree, and where they split
Olney, Illinois (IL) is at its warmest in Jun (average highs near 86°F) and coldest in Jan (lows around 25°F), with roughly 46 in of precipitation across the year. Below, compare what NWS, American, European forecast for Olney right now, and see exactly where they disagree.
average daytime high and overnight low across a typical year (1991-2020)
Jan
39°
25°
Feb
46°
25°
Mar
54°
35°
Apr
67°
47°
May
77°
57°
Jun
86°
66°
Jul
86°
68°
Aug
85°
67°
Sep
78°
59°
Oct
67°
48°
Nov
53°
37°
Dec
42°
28°
Source: 1991-2020 averages, ERA5 for this place adjusted with NASA POWER.
How Olney's weather has changed since 1995
30 years of daily data, 1995-2024, shown as change
+1.2°F
Around Olney, 2015-2024 averaged 1.2°F warmer than 1995-2004. 4 of the 10 warmest years since 1995 fall in the last ten, and the warmest was 2012.
1995each stripe is one year2024
cooler than averagearound averagewarmer than average
Days above 86°F
no clear change
2015-2024 against 1995-2004. Within the normal year-to-year swing
Frost nights
10 fewer nights a year
2015-2024 against 1995-2004, below 32°F. Within the normal year-to-year swing
Average wind
−2%
2015-2024 against 1995-2004. Within the normal year-to-year swing
Bars: each year against the area's 30-year average. Dashed lines: the average of the first and the last ten years.
See the numbers year by year
Year
Temp vs average
Days >86°F vs avg
Frost nights vs avg
Wind vs avg
1995
−1.1°F
−10
+13
−2%
1996
−2.5°F
−8
+27
+5%
1997
−2.2°F
−9
+3
−2%
1998
+1.6°F
−0
−17
−2%
1999
+0.5°F
+14
−9
+3%
2000
−1.1°F
−5
+11
+0%
2001
+0.9°F
+25
−10
−2%
2002
+0.2°F
+21
+6
+0%
2003
−0.9°F
−5
+6
+3%
2004
±0.0°F
−20
−4
+3%
2005
+0.7°F
+24
−2
−2%
2006
+0.7°F
−5
−8
+3%
2007
+1.3°F
+26
+10
−2%
2008
−2.0°F
−23
+16
+7%
2009
−1.4°F
−28
−3
+0%
2010
+0.2°F
+26
−1
−2%
2011
±0.0°F
−0
−10
+3%
2012
+2.9°F
+35
−13
+0%
2013
−2.0°F
−22
+20
−2%
2014
−3.2°F
−31
+23
+0%
2015
−0.2°F
−25
−11
−2%
2016
+1.1°F
+1
−3
−4%
2017
+2.0°F
+15
−17
+3%
2018
−0.2°F
+13
+12
−2%
2019
−0.4°F
−16
+8
−2%
2020
±0.0°F
−20
−10
−4%
2021
+0.7°F
−4
−1
−2%
2022
−0.5°F
−6
+9
+3%
2023
+2.3°F
+18
−29
−2%
2024
+2.7°F
+20
−24
−2%
Source: NASA POWER daily data from the MERRA-2 reanalysis, 1995-2024. Each value describes a grid square of about 50 km around Olney, not a weather station, and a square that takes in sea or a large lake runs milder than the city itself. That is why this section shows change against the square's own 30-year average rather than counts you could compare with a local station. Rain and snow are left out because their long-term record in this dataset is not consistent over time. "Within the normal year-to-year swing" means the change is smaller than the usual differences between single years.
Which forecast is most accurate in the US?
CheckWeather Score, graded against the weather that actually happened
Provider
CheckWeather-score
Temp
Wind
Rain
Run by
European ★ Best
93
/100rank #1
91±0.9°F
97±1.1 mph
9396% hit
ECMWF - European Centre for Medium-Range Weather ForecastsReading, United Kingdom
American
82
/100rank #2
83±1.7°F
94±2.0 mph
7184% hit
NOAA / NCEP (United States)College Park, Maryland, USA
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Common questions
What's the weather in Olney today?
On this page we show what NWS, American, European each forecast for Olney today, side by side and updated live. When all three agree the forecast is reliable; when they split, we flag it so you know the day is genuinely less certain.
Will it rain in Olney today or tomorrow?
Check the hourly strip and 7-day forecast above. We compare rain from NWS, American, European for Olney and flag the days where the models disagree on whether showers actually arrive, which is exactly when a single app can catch you out.
Which forecast is most accurate for Olney?
No single model is always right. NWS, American, European each run their own physics, so we line all three up: when they agree the Olney forecast is reliable, and when they split you should expect surprises. See our tested US accuracy scoreboard for how the models compare.
What is the warmest month in Olney?
June is typically the warmest month in Olney, with average highs around 86°F.
How cold does Olney get?
The coldest month in Olney is January, when overnight lows average about 25°F.
How much rain does Olney get?
Olney sees roughly 46 in of precipitation a year, with May usually the wettest month.
Is Olney getting warmer?
Yes. In NASA's reanalysis for the area around Olney, 2015-2024 averaged 1.2°F warmer than 1995-2004.
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