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Contents
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
Weather in January
January, the same as December, is a wintry winter month in Olney, Illinois, with an average temperature varying between 24.3°F (-4.3°C) and 36.7°F (2.6°C). Olney's January weather, with an average high temperature of 36.7°F (2.6°C) and an average low temperature of 24.3°F (-4.3°C), tends to be the coldest of the year. Weather in January »
Weather in February
February, the last month of the winter in Olney, is also an icy month, with an average temperature ranging between min 28.2°F (-2.1°C) and max 41.7°F (5.4°C). As Olney welcomes February, the average high-temperature records at a still cold 41.7°F (5.4°C), marking an insignificant deviation from the prior month. Weather in February »
Weather in March
March, the first month of the spring in Olney, is a fresh month, with an average temperature ranging between min 37.8°F (3.2°C) and max 53.1°F (11.7°C). The shift from February to March sees an increase in the average high-temperature, transitioning from an icy 41.7°F (5.4°C) to a cool 53.1°F (11.7°C). Weather in March »
Weather in April
April in Olney, Illinois, is a comfortable spring month, with an average temperature ranging between min 47.7°F (8.7°C) and max 64.2°F (17.9°C). The transition from March to April brings a temperature rise, with average high-temperatures increasing from a fresh 53.1°F (11.7°C) to a comfortable 64.2°F (17.9°C). Weather in April »
Weather in May
The last month of the spring, May, is a warm month in Olney, Illinois, with an average temperature ranging between min 57.9°F (14.4°C) and max 73.9°F (23.3°C). Olney in May experiences an increase in the average high-temperature, moving from April's refreshing 64.2°F (17.9°C) to a moderately hot 73.9°F (23.3°C). Weather in May »
Weather in June
The first month of the summer, June, is still a warm month in Olney, Illinois, with an average temperature ranging between max 82.2°F (27.9°C) and min 65.7°F (18.7°C). Olney's transition into June is marked by a minor temperature shift, moving from 73.9°F (23.3°C) in May to a still warm 82.2°F (27.9°C). Weather in June »
Weather in July
July, like June, in Olney, Illinois, is a moderately hot summer month, with temperature in the range of an average low of 67.5°F (19.7°C) and an average high of 84.2°F (29°C). July, characterized by an average high temperature of 84.2°F (29°C) and a low temperature of 67.5°F (19.7°C), is generally the warmest month. The heat index in July is calculated to be a torrid 95°F (35°C). Weather in July »
Weather in August
August, the last month of the summer in Olney, is another warm month, with an average temperature ranging between min 65.7°F (18.7°C) and max 82.8°F (28.2°C). As August takes its course, Olney's average high-temperature registers at a still moderately hot 82.8°F (28.2°C), closely aligning with the preceding month. Weather in August »
Weather in September
September, the first month of the autumn in Olney, is still a warm month, with an average temperature ranging between max 78.1°F (25.6°C) and min 59.9°F (15.5°C). As Olney steps into September, the average high-temperature holds at a still moderately hot 78.1°F (25.6°C), hinting at a minor fluctuation from the prior month. Weather in September »
Weather in October
October, like September, in Olney, Illinois, is another enjoyable autumn month, with an average temperature varying between 65.8°F (18.8°C) and 49.3°F (9.6°C). Welcoming October, Olney observes a shift in the average high-temperature, falling from September's moderately hot 78.1°F (25.6°C) to a refreshing 65.8°F (18.8°C). Weather in October »
Weather in November
November, the last month of the autumn in Olney, is also a fresh month, with an average temperature ranging between min 37.9°F (3.3°C) and max 52°F (11.1°C). November is characterized by a reduction in the average high-temperature, from an enjoyable 65.8°F (18.8°C) in October to a fresh 52°F (11.1°C). Weather in November »
Weather in December
The first month of the winter, December, is also a wintry month in Olney, Illinois, with temperature in the range of an average high of 41.5°F (5.3°C) and an average low of 30.9°F (-0.6°C). As December commences, the average high-temperature shows a reduction, transitioning from a cool 52°F (11.1°C) in November to an icy 41.5°F (5.3°C). Weather in December »
Updated: Feb 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What part of the year is the coldest in Olney?
January stands out as Olney's coldest month, with an average high-temperature of 36.7°F (2.6°C) and a low-temperature of 24.3°F (-4.3°C).
How much does it rain in Olney?
In Olney, Illinois, during the entire year, the rain falls for 152.3 days and collects up to 27.99" (711mm) of precipitation.
When does it snow in Olney?
January through April, November and December are months with snowfall in Olney.
When does it snow the most in Olney?
The month with the most snowfall in Olney, Illinois, is January, when snow falls for 5.9 days and typically aggregates up to 1.54" (39mm) of snow.
How many days does it snow in Olney?
In Olney, during the entire year, snow falls for 20.3 days and aggregates up to 5.47" (139mm) of snow.
What is the month with the least sunshine in Olney?
January has the least sunshine of the year, with an average of 4.4h of sunshine.
What is the month with the lowest UV index in Olney?
The months with the lowest UV index in Olney are January, February, November and December, with an average maximum UV index of 2.
When is Daylight Saving Time (DST) in Olney?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Olney, Illinois, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from CDT to CST.
What is the rainiest month in Olney?
The month with the most rainfall is April, when the rain falls for 15.1 days and typically aggregates up to 4.09" (104mm) of precipitation.
When it does not snow in Olney?
In Olney, Illinois, snow does not fall in May through October.
When is the highest UV index in Olney?
May through August, with an average maximum UV index of 6, are months with the highest UV index in Olney.
When are the longest days in Olney?
With an average of 14h and 48min of daylight, June has the longest days of the year.
What month has the most sunshine in Olney?
June has the most sunshine of the year in Olney, Illinois, with an average of 10.6h of sunshine.
What is the hottest time of year in Olney?
The month of July sees the average highest temperatures, reaching 84.2°F (29°C) at the peak and 67.5°F (19.7°C) at the low.
What is the most humid month in Olney?
The most humid month is July, with an average relative humidity of 81%.
What is the driest month in Olney?
September is the month with the least rainfall in Olney, Illinois. Rain falls for 12.7 days and accumulates 1.54" (39mm) of precipitation.
What is the least humid month in Olney?
The least humid month in Olney, Illinois, is October, with an average relative humidity of 70%.
What is the month with the shortest days in Olney?
With an average of 9h and 30min of daylight, December has the shortest days of the year in Olney.
Average temperature
Olney, IL
The warmest month (with the highest average high temperature) is July (84.2°F).
The month with the lowest average high temperature is January (36.7°F).
The month with the highest average low temperature is July (67.5°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).
Average pressure
Olney, IL
- Average pressure in January:
30.16"Hg - Average pressure in February:
30.12"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.95"Hg - Average pressure in May:
29.97"Hg - Average pressure in June:
29.93"Hg
- Average pressure in July:
29.98"Hg - Average pressure in August:
29.98"Hg - Average pressure in September:
30.03"Hg - Average pressure in October:
30.04"Hg - Average pressure in November:
30.14"Hg - Average pressure in December:
30.13"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed
Olney, IL
- Average wind speed in January:
10.2mph - Average wind speed in February:
10.2mph - Average wind speed in March:
10mph - Average wind speed in April:
9.9mph - Average wind speed in May:
8.3mph - Average wind speed in June:
7.1mph
- Average wind speed in July:
5.9mph - Average wind speed in August:
6mph - Average wind speed in September:
6.7mph - Average wind speed in October:
8.6mph - Average wind speed in November:
9.3mph - Average wind speed in December:
9.4mph
The windiest months (with the highest average wind speed) are January and February (10.2mph).
The calmest month (with the lowest average wind speed) is July (5.9mph).
Average humidity
Olney, IL
The month with the highest relative humidity is July (81%).
The month with the lowest relative humidity is October (70%).
Average rainfall
Olney, IL
- Average rainfall in January:
1.93" - Average rainfall in February:
1.57" - Average rainfall in March:
2.32" - Average rainfall in April:
4.09" - Average rainfall in May:
2.99" - Average rainfall in June:
2.64"
- Average rainfall in July:
2.6" - Average rainfall in August:
2.13" - Average rainfall in September:
1.54" - Average rainfall in October:
2.13" - Average rainfall in November:
1.89" - Average rainfall in December:
2.17"
The wettest month (with the highest rainfall) is April (4.09").
The driest month (with the least rainfall) is September (1.54").
Average rainfall days
Olney, IL
- Average rainfall days in January:
8.8 days - Average rainfall days in February:
9.3 days - Average rainfall days in March:
13.9 days - Average rainfall days in April:
15.1 days - Average rainfall days in May:
17.1 days - Average rainfall days in June:
14.9 days
- Average rainfall days in July:
16.9 days - Average rainfall days in August:
13.2 days - Average rainfall days in September:
12.7 days - Average rainfall days in October:
10.2 days - Average rainfall days in November:
9.7 days - Average rainfall days in December:
10.5 days
The month with the highest number of rainy days is May (17.1 days).
The month with the least rainy days is January (8.8 days).
Average snowfall
Olney, IL
The month with the highest snowfall is January (1.54").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days
Olney, IL
- Average snowfall days in January:
5.9 days - Average snowfall days in February:
5.5 days - Average snowfall days in March:
2.5 days - Average snowfall days in April:
0.3 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0.2 days - Average snowfall days in November:
1.4 days - Average snowfall days in December:
4.5 days
The month with the highest number of snowfall days is January (5.9 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Olney, IL
- Average daylight in January:
9h and 5min - Average daylight in February:
10h and 5min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 1min - Average daylight in May:
14h and 2min - Average daylight in June:
14h and 5min
- Average daylight in July:
14h and 4min - Average daylight in August:
13h and 4min - Average daylight in September:
12h and 2min - Average daylight in October:
11h and 1min - Average daylight in November:
10h and 1min - Average daylight in December:
9h and 3min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in January:
4h and 2min - Average sunshine in February:
4h and 4min - Average sunshine in March:
6h and 2min - Average sunshine in April:
8h and 2min - Average sunshine in May:
9h and 1min - Average sunshine in June:
10h and 4min
- Average sunshine in July:
10h and 2min - Average sunshine in August:
10h and 2min - Average sunshine in September:
9h and 1min - Average sunshine in October:
6h and 4min - Average sunshine in November:
5h and 3min - Average sunshine in December:
4h and 4min
The month with the most sunshine is June (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).
Average sunshine days
Olney, IL
- Average sunshine days in January:
17.2 days - Average sunshine days in February:
14 days - Average sunshine days in March:
14.1 days - Average sunshine days in April:
12.6 days - Average sunshine days in May:
11.7 days - Average sunshine days in June:
11.6 days
- Average sunshine days in July:
11.2 days - Average sunshine days in August:
14.3 days - Average sunshine days in September:
15.4 days - Average sunshine days in October:
18.8 days - Average sunshine days in November:
18.4 days - Average sunshine days in December:
16.5 days
The month with the most sunshine days is October (18.8 days).
The month with the least sunshine days is July (11.2 days).
Average UV index
Olney, IL
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover
Olney, IL
The month with the most cloud cover is January (Cloud cover 52).
The months with the least cloud cover are June and August (Cloud cover 28).
Average visibility
Olney, IL
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Olney, Illinois, USA
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