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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, like December, in Prairie du Rocher, Illinois, is an icy winter month, with temperature in the range of an average low of 25.9°F (-3.4°C) and an average high of 39.6°F (4.2°C). Prairie du Rocher's coldest month, January, generally records average temperatures ranging from a high of 39.6°F (4.2°C) to a low of 25.9°F (-3.4°C). Weather in January »
Weather in February
The last month of the winter, February, is a chilly month in Prairie du Rocher, Illinois, with an average temperature varying between 43.9°F (6.6°C) and 28.9°F (-1.7°C). With the advent of February, Prairie du Rocher experiences an average high-temperature of a frosty 43.9°F (6.6°C), mirroring a close resemblance to the previous month. Weather in February »
Weather in March
March, the first month of the spring in Prairie du Rocher, is a moderate month, with an average temperature fluctuating between 55.4°F (13°C) and 38.8°F (3.8°C). Prairie du Rocher in March sees a temperature change, with average high-temperatures moving from a chilly 43.9°F (6.6°C) in February to a mild 55.4°F (13°C). Weather in March »
Weather in April
April is a refreshing spring month in Prairie du Rocher, Illinois, with an average temperature varying between 66.6°F (19.2°C) and 48°F (8.9°C). April's arrival brings a change in high-temperatures, moving from a refreshing 55.4°F (13°C) in March to an enjoyable 66.6°F (19.2°C). Weather in April »
Weather in May
May, the last month of the spring in Prairie du Rocher, is a warm month, with an average temperature fluctuating between 76.3°F (24.6°C) and 57.6°F (14.2°C). Entering May, Prairie du Rocher sees a temperature rise, with the average high-temperature advancing from April's refreshing 66.6°F (19.2°C) to a warm 76.3°F (24.6°C). Weather in May »
Weather in June
The first month of the summer, June, is still a warm month in Prairie du Rocher, Illinois, with an average temperature ranging between max 85.6°F (29.8°C) and min 66.4°F (19.1°C). In June, the meteorological conditions change with the average high-temperature moving from a warm 76.3°F (24.6°C) in May to a still moderately hot 85.6°F (29.8°C). Weather in June »
Weather in July
July in Prairie du Rocher, Illinois, is a tropical summer month, with an average temperature fluctuating between 68.4°F (20.2°C) and 87.6°F (30.9°C). July, recording an average high temperature of 87.6°F (30.9°C) and a low temperature of 68.4°F (20.2°C), is Prairie du Rocher's warmest month. In July, the average heat index is calculated to be a blisteringly hot 104°F (40°C). Weather in July »
Weather in August
August, the last month of the summer in Prairie du Rocher, is also a hot month, with an average temperature fluctuating between 86.5°F (30.3°C) and 66°F (18.9°C). Prairie du Rocher experiences a recorded average high-temperature of a still tropical 86.5°F (30.3°C) in August, closely aligned with July's 87.6°F (30.9°C). Weather in August »
Weather in September
September, the first month of the autumn in Prairie du Rocher, is still a warm month, with temperature in the range of an average high of 80.2°F (26.8°C) and an average low of 59.9°F (15.5°C). The shift from August to September coincides with a small decrease in the average high-temperature, down to a warm 80.2°F (26.8°C) from a tropical 86.5°F (30.3°C). Weather in September »
Weather in October
October, the same as September, is another comfortable autumn month in Prairie du Rocher, Illinois, with an average temperature fluctuating between 49.1°F (9.5°C) and 67.6°F (19.8°C). The average high-temperature drops in October, from September's warm 80.2°F (26.8°C) to a comfortable 67.6°F (19.8°C). Weather in October »
Weather in November
November, the last month of the autumn in Prairie du Rocher, is also a fresh month, with an average temperature ranging between min 38.3°F (3.5°C) and max 54°F (12.2°C). November's onset brings a slight change in high-temperatures, falling from a refreshing 67.6°F (19.8°C) in October to a cool 54°F (12.2°C). Weather in November »
Weather in December
The first month of the winter, December, is also a frosty month in Prairie du Rocher, Illinois, with an average temperature ranging between min 31.1°F (-0.5°C) and max 43.9°F (6.6°C). December's arrival correlates with a reduction in the average high-temperature, down from a cool 54°F (12.2°C) in November to a chilly 43.9°F (6.6°C). Weather in December »
Updated: Aug 29, 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 time of the year is the coldest?
January, characterized by an average high temperature of 39.6°F (4.2°C) and a low temperature of 25.9°F (-3.4°C), is generally the coldest month.
How many days does it rain?
In Prairie du Rocher, during the entire year, the rain falls for 145 days and collects up to 32.24" (819mm) of precipitation.
When does it snow?
Months with snowfall are January through March, November and December.
What is the snowiest month?
The months with the most snowfall are January and February, with an average 2.36" (60mm) of accumulated snow.
How much does it snow?
Throughout the year, there are 15.8 snowfall days, and 6.77" (172mm) of snow is accumulated.
What is the month with the least sunshine?
The month with the least sunshine is January, with an average of 4.6h of sunshine.
What is the month with the lowest UV index?
The months with the lowest UV index in Prairie du Rocher are January, February and December, with an average maximum UV index of 2.
What is the driest month?
February and September are months with the least rain when the rain falls for 8.8 days and typically aggregates up to 1.81" (46mm) of rain.
When is Daylight Saving Time (DST)?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, 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.
When it does not snow?
April through October are months without snowfall.
What is the most humid month?
May is the most humid month in Prairie du Rocher, with an average relative humidity of 79%.
What is the rainiest month in Prairie du Rocher?
The month with the most rainfall is May, when the rain falls for 15.8 days and typically aggregates up to 3.86" (98mm) of precipitation.
What are the months with the highest UV index?
The months with the highest UV index are May through August, with an average maximum UV index of 6.
When are the longest days in Prairie du Rocher?
The month with the longest days is June, with an average of 14h and 48min of daylight.
What are the months with the most sunshine?
The months with the most sunshine are June and July, with an average of 10.4h of sunshine.
What part of the year is the hottest?
The warmest period tends to be July, when average temperatures fluctuate between a high of 87.6°F (30.9°C) and a low of 68.4°F (20.2°C).
What is the least humid month?
The least humid month is October, with an average relative humidity of 71%.
What is the month with the shortest days?
With an average of 9h and 36min of daylight, December has the shortest days of the year in Prairie du Rocher.
Average temperature
Prairie du Rocher, IL
The warmest month (with the highest average high temperature) is July (87.6°F).
The month with the lowest average high temperature is January (39.6°F).
The month with the highest average low temperature is July (68.4°F).
The coldest month (with the lowest average low temperature) is January (25.9°F).
Average pressure
Prairie du Rocher, IL
- Average pressure in January:
30.16"Hg - Average pressure in February:
30.12"Hg - Average pressure in March:
30.07"Hg - Average pressure in April:
29.94"Hg - Average pressure in May:
29.96"Hg - Average pressure in June:
29.93"Hg
- Average pressure in July:
29.97"Hg - Average pressure in August:
29.98"Hg - Average pressure in September:
30.02"Hg - Average pressure in October:
30.04"Hg - Average pressure in November:
30.13"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
Prairie du Rocher, IL
- Average wind speed in January:
9.4mph - Average wind speed in February:
9.2mph - Average wind speed in March:
8.9mph - Average wind speed in April:
8.9mph - Average wind speed in May:
7.3mph - Average wind speed in June:
6.4mph
- Average wind speed in July:
5.5mph - Average wind speed in August:
5.5mph - Average wind speed in September:
5.9mph - Average wind speed in October:
7.7mph - Average wind speed in November:
8.4mph - Average wind speed in December:
8.6mph
The windiest month (with the highest average wind speed) is January (9.4mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).
Average humidity
Prairie du Rocher, IL
The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is October (71%).
Average rainfall
Prairie du Rocher, IL
- Average rainfall in January:
2.13" - Average rainfall in February:
1.81" - Average rainfall in March:
2.8" - Average rainfall in April:
3.74" - Average rainfall in May:
3.86" - Average rainfall in June:
3.19"
- Average rainfall in July:
2.91" - Average rainfall in August:
2.83" - Average rainfall in September:
1.81" - Average rainfall in October:
2.76" - Average rainfall in November:
2.17" - Average rainfall in December:
2.24"
The wettest month (with the highest rainfall) is May (3.86").
The driest months (with the least rainfall) are February and September (1.81").
Average rainfall days
Prairie du Rocher, IL
- Average rainfall days in January:
7.3 days - Average rainfall days in February:
8.8 days - Average rainfall days in March:
14.2 days - Average rainfall days in April:
14.5 days - Average rainfall days in May:
15.8 days - Average rainfall days in June:
13.8 days
- Average rainfall days in July:
16.3 days - Average rainfall days in August:
13.5 days - Average rainfall days in September:
11.8 days - Average rainfall days in October:
10.7 days - Average rainfall days in November:
9.5 days - Average rainfall days in December:
8.8 days
The month with the highest number of rainy days is July (16.3 days).
The month with the least rainy days is January (7.3 days).
Average snowfall
Prairie du Rocher, IL
The months with the highest snowfall are January and February (2.36").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days
Prairie du Rocher, IL
- Average snowfall days in January:
5.7 days - Average snowfall days in February:
4.7 days - Average snowfall days in March:
1.3 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 days - Average snowfall days in November:
1.2 days - Average snowfall days in December:
2.6 days
The month with the highest number of snowfall days is January (5.7 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Prairie du Rocher, 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 3min - 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 4min
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 36min).
- Average sunshine in January:
4h and 4min - Average sunshine in February:
4h and 5min - 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 2min
- Average sunshine in July:
10h and 2min - Average sunshine in August:
10h and 1min - Average sunshine in September:
9h and 1min - Average sunshine in October:
6h and 2min - Average sunshine in November:
5h and 4min - Average sunshine in December:
4h and 5min
The months with the most sunshine are June and July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).
Average sunshine days
Prairie du Rocher, IL
- Average sunshine days in January:
17.9 days - Average sunshine days in February:
15 days - Average sunshine days in March:
14.9 days - Average sunshine days in April:
14 days - Average sunshine days in May:
13.4 days - Average sunshine days in June:
14.5 days
- Average sunshine days in July:
12.3 days - Average sunshine days in August:
15 days - Average sunshine days in September:
16.6 days - Average sunshine days in October:
19 days - Average sunshine days in November:
19 days - Average sunshine days in December:
19.7 days
The month with the most sunshine days is December (19.7 days).
The month with the least sunshine days is July (12.3 days).
Average UV index
Prairie du Rocher, 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 and December (UV index 2).
Average cloud cover
Prairie du Rocher, IL
The months with the most cloud cover are January and February (Cloud cover 49).
The months with the least cloud cover are June and August (Cloud cover 28).
Average visibility
Prairie du Rocher, 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).
Prairie du Rocher, Illinois, USA
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