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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, is a freezing cold winter month in Irwin, Illinois, with temperature in the range of an average high of 30°F (-1.1°C) and an average low of 18.3°F (-7.6°C). In Irwin, Illinois, the month of January is known for its lowest average temperatures, reaching a high of 30°F (-1.1°C) and a low of 18.3°F (-7.6°C). Weather in January »
Weather in February
February, the last month of the winter in Irwin, is an icy month, with temperature in the range of an average low of 21.6°F (-5.8°C) and an average high of 34.2°F (1.2°C). The introduction of February notes a subtle temperature variation to a cold 34.2°F (1.2°C) from January's 30°F (-1.1°C). Weather in February »
Weather in March
March, the first month of the spring in Irwin, is a frosty month, with an average temperature ranging between max 47.3°F (8.5°C) and min 33.3°F (0.7°C). As Irwin transitions into March, the average high-temperature is observed to rise from an icy 34.2°F (1.2°C) in February to a frosty 47.3°F (8.5°C). Weather in March »
Weather in April
April in Irwin, Illinois, is a mild spring month, with an average temperature varying between 59.5°F (15.3°C) and 43.5°F (6.4°C). April's onset is marked by a temperature increase, moving from a frosty 47.3°F (8.5°C) in March to a mild 59.5°F (15.3°C). Weather in April »
Weather in May
May, the last month of the spring in Irwin, is an agreeable month, with an average temperature varying between 71.2°F (21.8°C) and 54.1°F (12.3°C). May's onset brings a rise in the average high-temperature, moving from a moderate 59.5°F (15.3°C) in April to a pleasant 71.2°F (21.8°C). Weather in May »
Weather in June
June, the first month of the summer in Irwin, is a warm month, with an average temperature varying between 62.2°F (16.8°C) and 79.3°F (26.3°C). The arrival of June witnesses a small shift in the average high-temperature, moving from an agreeable 71.2°F (21.8°C) in May to a warm 79.3°F (26.3°C). Weather in June »
Weather in July
July, the same as June, is another warm summer month in Irwin, Illinois, with an average temperature varying between 81.1°F (27.3°C) and 64.2°F (17.9°C). Irwin's warmest temperatures are experienced in July, with average high temperatures of 81.1°F (27.3°C) and lows of 64.2°F (17.9°C). For most parts of July, the heat index is evaluated at a hot 87.8°F (31°C). Weather in July »
Weather in August
August, the last month of the summer in Irwin, is another warm month, with an average temperature fluctuating between 79.7°F (26.5°C) and 62.6°F (17°C). The introduction of August notes a subtle temperature variation to a still moderately hot 79.7°F (26.5°C) from July's 81.1°F (27.3°C). Weather in August »
Weather in September
September, the first month of the autumn in Irwin, is still a warm month, with an average temperature ranging between min 57.2°F (14°C) and max 75°F (23.9°C). In September, the average high-temperature registers at a still moderately hot 75°F (23.9°C), nearly identical to August's 79.7°F (26.5°C). Weather in September »
Weather in October
October, like September, in Irwin, Illinois, is another enjoyable autumn month, with an average temperature fluctuating between 61.9°F (16.6°C) and 46.8°F (8.2°C). The beginning of October marks a decrease in the average high-temperature, transitioning from a warm 75°F (23.9°C) in September to an enjoyable 61.9°F (16.6°C). Weather in October »
Weather in November
The last month of the autumn, November, is another chilly month in Irwin, Illinois, with temperature in the range of an average high of 47.5°F (8.6°C) and an average low of 34.9°F (1.6°C). The arrival of November is marked by a notable decrease in high-temperatures, falling from an enjoyable 61.9°F (16.6°C) in October to a frosty 47.5°F (8.6°C). Weather in November »
Weather in December
December, the first month of the winter in Irwin, is still a cold month, with an average temperature fluctuating between 36.3°F (2.4°C) and 26.1°F (-3.3°C). Stepping into December, Irwin observes a temperature decline, with the average high falling from November's chilly 47.5°F (8.6°C) to a wintry 36.3°F (2.4°C). Weather in December »
Updated: Jun 18, 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 time of year in Irwin?
Irwin notes the coldest temperatures in January, with a average high of 30°F (-1.1°C) and a low of 18.3°F (-7.6°C).
How much does it rain?
In Irwin, during the entire year, the rain falls for 142.1 days and collects up to 22.56" (573mm) of precipitation.
When does it snow?
Months with snowfall are January through April, October through December.
What is the snowiest month?
The month with the most snowfall is January, when snow falls for 11.7 days and typically aggregates up to 2.17" (55mm) of snow.
How many days does it snow?
Throughout the year, in Irwin, Illinois, there are 39 snowfall days, and 9.02" (229mm) of snow is accumulated.
What is the month with the least sunshine?
With an average of 3.8h of sunshine, January has the least sunshine of the year.
What is the month with the lowest UV index in Irwin?
January and December, with an average maximum UV index of 1, are months with the lowest UV index.
What is the driest month?
The month with the least rainfall is February, when the rain falls for 5 days and typically collects 1.06" (27mm) of precipitation.
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 wettest month?
May is the month with the most rainfall. Rain falls for 17.8 days and accumulates 3.27" (83mm) of precipitation.
When it does not snow?
In Irwin, snow does not fall in May through September.
When are the longest days?
The month with the longest days is June, with an average of 15h and 6min of daylight.
What are the months with the most sunshine in Irwin?
The months with the most sunshine are June and July, with an average of 9.7h of 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 is the warmest month?
In Irwin, July is identified by the average highest temperatures, reaching a peak of 81.1°F (27.3°C) and a low of 64.2°F (17.9°C).
What is the most humid month?
The most humid month is July, with an average relative humidity of 85%.
What is the least humid month in Irwin?
With an average relative humidity of 72%, October is the least humid month.
What is the month with the shortest days?
December has the shortest days of the year, with an average of 9h and 18min of daylight.
Average temperature
Irwin, IL
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (30°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 (18.3°F).
Average pressure
Irwin, 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:
29.92"Hg
- Average pressure in July:
29.97"Hg - Average pressure in August:
29.98"Hg - Average pressure in September:
30.03"Hg - Average pressure in October:
30.01"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 (29.92"Hg).
Average wind speed
Irwin, IL
- Average wind speed in January:
10.2mph - Average wind speed in February:
10mph - Average wind speed in March:
9.8mph - Average wind speed in April:
10.2mph - Average wind speed in May:
8.7mph - 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:
7.2mph - Average wind speed in October:
9mph - Average wind speed in November:
9.8mph - Average wind speed in December:
9.6mph
The windiest months (with the highest average wind speed) are January and April (10.2mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).
Average humidity
Irwin, IL
The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (72%).
Average rainfall
Irwin, IL
- Average rainfall in January:
1.14" - Average rainfall in February:
1.06" - Average rainfall in March:
1.5" - Average rainfall in April:
2.28" - Average rainfall in May:
3.27" - Average rainfall in June:
2.76"
- Average rainfall in July:
2.4" - Average rainfall in August:
2.24" - Average rainfall in September:
1.57" - Average rainfall in October:
2.01" - Average rainfall in November:
1.18" - Average rainfall in December:
1.14"
The wettest month (with the highest rainfall) is May (3.27").
The driest month (with the least rainfall) is February (1.06").
Average rainfall days
Irwin, IL
- Average rainfall days in January:
5.5 days - Average rainfall days in February:
5 days - Average rainfall days in March:
11.5 days - Average rainfall days in April:
14.7 days - Average rainfall days in May:
17.8 days - Average rainfall days in June:
16.8 days
- Average rainfall days in July:
17.4 days - Average rainfall days in August:
15 days - Average rainfall days in September:
12.2 days - Average rainfall days in October:
11 days - Average rainfall days in November:
7.9 days - Average rainfall days in December:
7.3 days
The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is February (5 days).
Average snowfall
Irwin, IL
The month with the highest snowfall is January (2.17").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Irwin, IL
- Average snowfall days in January:
11.7 days - Average snowfall days in February:
9.1 days - Average snowfall days in March:
5.2 days - Average snowfall days in April:
1.4 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:
2.7 days - Average snowfall days in December:
8.5 days
The month with the highest number of snowfall days is January (11.7 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Irwin, 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 5min - Average sunshine in February:
3h and 5min - Average sunshine in March:
6h and 0min - Average sunshine in April:
7h and 4min - Average sunshine in May:
8h and 5min - Average sunshine in June:
9h and 4min
- Average sunshine in July:
9h and 4min - Average sunshine in August:
9h and 4min - Average sunshine in September:
8h and 4min - Average sunshine in October:
5h and 5min - Average sunshine in November:
5h and 1min - Average sunshine in December:
4h and 2min
The months with the most sunshine are June and July (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days
Irwin, IL
- Average sunshine days in January:
15.1 days - Average sunshine days in February:
14 days - Average sunshine days in March:
15 days - Average sunshine days in April:
11.6 days - Average sunshine days in May:
10.8 days - Average sunshine days in June:
10 days
- Average sunshine days in July:
9.3 days - Average sunshine days in August:
11.8 days - Average sunshine days in September:
14.7 days - Average sunshine days in October:
17.1 days - Average sunshine days in November:
18.7 days - Average sunshine days in December:
16.8 days
The month with the most sunshine days is November (18.7 days).
The month with the least sunshine days is July (9.3 days).
Average UV index
Irwin, 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
Irwin, IL
The month with the most cloud cover is January (Cloud cover 60).
The months with the least cloud cover are August and September (Cloud cover 34).
Average visibility
Irwin, 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).
Irwin, Illinois, USA
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