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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, in Iroquois, Illinois, is another subzero cold winter month, with an average temperature fluctuating between 18.9°F (-7.3°C) and 30.7°F (-0.7°C). Temperature records mark January as the coldest month, with highs averaging 30.7°F (-0.7°C) and lows at 18.9°F (-7.3°C). Weather in January »
Weather in February
The last month of the winter, February, is a cold month in Iroquois, Illinois, with an average temperature ranging between min 22.3°F (-5.4°C) and max 35.1°F (1.7°C). In February, Iroquois experiences a barely noticeable shift in meteorological conditions, with average high-temperatures moving from 30.7°F (-0.7°C) in January to a cold 35.1°F (1.7°C). Weather in February »
Weather in March
The first month of the spring, March, is a frosty month in Iroquois, Illinois, with an average temperature ranging between min 33.4°F (0.8°C) and max 47.8°F (8.8°C). As March arrives, Iroquois's weather shows an increase in high-temperatures, moving from February's icy 35.1°F (1.7°C) to a chilly 47.8°F (8.8°C). Weather in March »
Weather in April
April is a moderate spring month in Iroquois, Illinois, with an average temperature fluctuating between 59.4°F (15.2°C) and 43.5°F (6.4°C). The shift into April is accompanied by a temperature increase, with the average high-temperature rising from a frosty 47.8°F (8.8°C) in March to a refreshing 59.4°F (15.2°C). Weather in April »
Weather in May
The last month of the spring, May, is an agreeable month in Iroquois, Illinois, with temperature in the range of an average high of 71.4°F (21.9°C) and an average low of 54.5°F (12.5°C). May comes with an increase, with the average high-temperature moving from a moderate 59.4°F (15.2°C) in April to an agreeable 71.4°F (21.9°C). Weather in May »
Weather in June
The first month of the summer, June, is a moderately hot month in Iroquois, Illinois, with an average temperature varying between 79.3°F (26.3°C) and 62.4°F (16.9°C). Observing a slight rise in June, the average high-temperature shifts from May's pleasant 71.4°F (21.9°C) to a moderately hot 79.3°F (26.3°C). Weather in June »
Weather in July
July, like June, in Iroquois, Illinois, is a moderately hot summer month, with an average temperature ranging between min 64.2°F (17.9°C) and max 81°F (27.2°C). Iroquois's July weather, marked by an average high temperature of 81°F (27.2°C) and an average low temperature of 64.2°F (17.9°C), is the warmest in the year. Throughout July, the heat index is estimated at a tropical 87.8°F (31°C). Weather in July »
Weather in August
August, the last month of the summer in Iroquois, is another warm month, with an average temperature ranging between max 79.5°F (26.4°C) and min 62.2°F (16.8°C). Iroquois registers an average high-temperature of a still moderately hot 79.5°F (26.4°C) with the arrival of August, showing minor deviation from the preceding month. Weather in August »
Weather in September
The first month of the autumn, September, is still a warm month in Iroquois, Illinois, with an average temperature ranging between max 75°F (23.9°C) and min 56.8°F (13.8°C). Stepping into September, Iroquois records an average high-temperature of a still moderately hot 75°F (23.9°C), almost consistent with August. Weather in September »
Weather in October
October, like September, in Iroquois, Illinois, is another comfortable autumn month, with temperature in the range of an average high of 62.2°F (16.8°C) and an average low of 46.9°F (8.3°C). Iroquois observes a minor decrease in the average high-temperature with the arrival of October, falling from September's warm 75°F (23.9°C) to a refreshing 62.2°F (16.8°C). Weather in October »
Weather in November
November, the last month of the autumn in Iroquois, is another chilly month, with an average temperature fluctuating between 34.7°F (1.5°C) and 47.8°F (8.8°C). Iroquois's weather in November is characterized by a distinct drop in the average high-temperature, reducing from a refreshing 62.2°F (16.8°C) in October to a chilly 47.8°F (8.8°C). Weather in November »
Weather in December
The first month of the winter, December, is still a cold month in Iroquois, Illinois, with an average temperature varying between 36.7°F (2.6°C) and 26.6°F (-3°C). A decrease in the average high-temperature is observed during December, shifting from a frosty 47.8°F (8.8°C) in November to a cold 36.7°F (2.6°C). Weather in December »
Updated: Aug 26, 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 is the coldest month?
January tends to be the coldest month, with temperatures averaging a daily high of 30.7°F (-0.7°C) and a low of 18.9°F (-7.3°C).
What is the driest month?
January and February are months with the least rain when the rain falls for 4.9 days and typically aggregates up to 0.79" (20mm) of rain.
How many days does it rain in Iroquois?
Throughout the year, there are 140.3 rainfall days, and 17.56" (446mm) of precipitation is accumulated.
When does it snow?
January through April, November and December are months with snowfall.
When does it snow the most?
The month with the most snowfall is January, when snow falls for 10.3 days and typically aggregates up to 2.05" (52mm) of snow.
How much does it snow?
Throughout the year, there are 36.9 snowfall days, and 7.56" (192mm) of snow is accumulated.
What is the month with the least sunshine?
With an average of 3.7h of sunshine, January has the least sunshine of the year.
What is the month with the lowest UV index in Iroquois?
The months with the lowest UV index in Iroquois, Illinois, are January and December, with an average maximum UV index of 1.
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.
What is the rainiest month?
The month with the most rainfall is May, when the rain falls for 17.5 days and typically aggregates up to 2.64" (67mm) of precipitation.
When it does not snow in Iroquois?
May through October are months without snowfall.
When are the longest days?
With an average of 15h and 6min of daylight, June has the longest days of the year in Iroquois.
What is the month with the most sunshine?
June and July, with an average of 9.8h of sunshine, are months with the most sunshine.
What are the months with the highest UV index?
June and July, with an average maximum UV index of 6, are months with the highest UV index.
What are the warmest months in Iroquois?
With average high and low temperatures of 81°F (27.2°C) and 64.2°F (17.9°C) respectively, July is Iroquois's warmest month.
What is the most humid month?
July is the most humid month, with an average relative humidity of 85%.
What is the least humid month?
With an average relative humidity of 72%, October is the least humid month in Iroquois.
What is the month with the shortest days?
The month with the shortest days is December, with an average of 9h and 18min of daylight.
Average temperature
Iroquois, IL
The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (30.7°F).
The month with the highest average low temperature is July (64.2°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).
Average pressure
Iroquois, IL
- Average pressure in January:
30.12"Hg - Average pressure in February:
30.1"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.95"Hg - Average pressure in May:
29.96"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:
30.02"Hg - Average pressure in November:
30.11"Hg - Average pressure in December:
30.11"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed
Iroquois, IL
- Average wind speed in January:
10.3mph - Average wind speed in February:
10mph - Average wind speed in March:
9.8mph - Average wind speed in April:
10.1mph - Average wind speed in May:
8.6mph - Average wind speed in June:
7.6mph
- Average wind speed in July:
6.3mph - Average wind speed in August:
6.2mph - Average wind speed in September:
7.1mph - Average wind speed in October:
9mph - Average wind speed in November:
9.7mph - Average wind speed in December:
9.6mph
The windiest month (with the highest average wind speed) is January (10.3mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).
Average humidity
Iroquois, IL
The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (72%).
Average rainfall
Iroquois, IL
- Average rainfall in January:
0.79" - Average rainfall in February:
0.79" - Average rainfall in March:
1.38" - Average rainfall in April:
1.97" - Average rainfall in May:
2.64" - Average rainfall in June:
2.24"
- Average rainfall in July:
2.01" - Average rainfall in August:
1.73" - Average rainfall in September:
1.1" - Average rainfall in October:
1.14" - Average rainfall in November:
0.87" - Average rainfall in December:
0.91"
The wettest month (with the highest rainfall) is May (2.64").
The driest months (with the least rainfall) are January and February (0.79").
Average rainfall days
Iroquois, IL
- Average rainfall days in January:
4.9 days - Average rainfall days in February:
5.5 days - Average rainfall days in March:
11.6 days - Average rainfall days in April:
14.8 days - Average rainfall days in May:
17.5 days - Average rainfall days in June:
16.3 days
- Average rainfall days in July:
17.8 days - Average rainfall days in August:
14.7 days - Average rainfall days in September:
11.3 days - Average rainfall days in October:
11.2 days - Average rainfall days in November:
8.1 days - Average rainfall days in December:
6.6 days
The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is January (4.9 days).
Average snowfall
Iroquois, IL
The month with the highest snowfall is January (2.05").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days
Iroquois, IL
- Average snowfall days in January:
10.3 days - Average snowfall days in February:
8.9 days - Average snowfall days in March:
4.8 days - Average snowfall days in April:
1.3 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:
0.4 days - Average snowfall days in November:
3.2 days - Average snowfall days in December:
8 days
The month with the highest number of snowfall days is January (10.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Iroquois, IL
- Average daylight in January:
9h and 4min - Average daylight in February:
10h and 4min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 2min - Average daylight in May:
14h and 3min - Average daylight in June:
15h and 1min
- Average daylight in July:
14h and 5min - Average daylight in August:
13h and 5min - Average daylight in September:
12h and 3min - Average daylight in October:
11h and 1min - Average daylight in November:
9h and 5min - Average daylight in December:
9h and 2min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in January:
3h and 4min - Average sunshine in February:
4h and 0min - Average sunshine in March:
6h and 0min - Average sunshine in April:
7h and 5min - Average sunshine in May:
8h and 4min - Average sunshine in June:
9h and 5min
- Average sunshine in July:
9h and 5min - Average sunshine in August:
9h and 4min - Average sunshine in September:
8h and 3min - Average sunshine in October:
6h and 1min - Average sunshine in November:
5h and 2min - Average sunshine in December:
4h and 1min
The months with the most sunshine are June and July (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days
Iroquois, IL
- Average sunshine days in January:
16.3 days - Average sunshine days in February:
14 days - Average sunshine days in March:
15.4 days - Average sunshine days in April:
12.3 days - Average sunshine days in May:
11 days - Average sunshine days in June:
10.9 days
- Average sunshine days in July:
9.4 days - Average sunshine days in August:
12.6 days - Average sunshine days in September:
15.5 days - Average sunshine days in October:
17.4 days - Average sunshine days in November:
19 days - Average sunshine days in December:
17.4 days
The month with the most sunshine days is November (19 days).
The month with the least sunshine days is July (9.4 days).
Average UV index
Iroquois, IL
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover
Iroquois, IL
The month with the most cloud cover is January (Cloud cover 61).
The months with the least cloud cover are July, August and September (Cloud cover 34).
Average visibility
Iroquois, IL
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
Iroquois, Illinois, USA
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