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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 another cold winter month in Granite City, Illinois, with an average temperature fluctuating between 37.2°F (2.9°C) and 24.3°F (-4.3°C). The lowest temperatures are recorded in January, with averages reaching a high of 37.2°F (2.9°C) and a low of 24.3°F (-4.3°C). Weather in January »
Weather in February
February, the last month of the winter in Granite City, is also an icy month, with temperature in the range of an average high of 42.3°F (5.7°C) and an average low of 27.5°F (-2.5°C). The transition from January to February sees average high-temperatures adjusting to a still cold 42.3°F (5.7°C), from a not significantly different 37.2°F (2.9°C). Weather in February »
Weather in March
The first month of the spring, March, is a cool month in Granite City, Illinois, with an average temperature fluctuating between 54.1°F (12.3°C) and 37.9°F (3.3°C). March's arrival is marked by an increase in the average high-temperature, moving from an icy 42.3°F (5.7°C) in February to a cool 54.1°F (12.3°C). Weather in March »
Weather in April
April in Granite City, Illinois, is a refreshing spring month, with temperature in the range of an average low of 48°F (8.9°C) and an average high of 65.1°F (18.4°C). As Granite City enters April, the average high-temperature increases from the a cool 54.1°F (12.3°C) of March to a comfortable 65.1°F (18.4°C). Weather in April »
Weather in May
May, the last month of the spring in Granite City, is a warm month, with temperature in the range of an average high of 74.7°F (23.7°C) and an average low of 57.7°F (14.3°C). In Granite City, stepping into May brings a temperature increase, moving up from April's refreshing 65.1°F (18.4°C) to a warm 74.7°F (23.7°C). Weather in May »
Weather in June
June, the first month of the summer in Granite City, is also a moderately hot month, with an average temperature ranging between max 83.8°F (28.8°C) and min 66.7°F (19.3°C). June's arrival brings a temperature shift, moving from a warm 74.7°F (23.7°C) in May to a still moderately hot 83.8°F (28.8°C). Weather in June »
Weather in July
July in Granite City, Illinois, is a hot summer month, with an average temperature fluctuating between 86.2°F (30.1°C) and 68.5°F (20.3°C). In Granite City, the month of July registers the highest temperatures, averaging 86.2°F (30.1°C) at the peak and 68.5°F (20.3°C) at the lowest. During July, the heat index is computed to be a fiery hot 98.6°F (37°C). Weather in July »
Weather in August
The last month of the summer, August, is also a moderately hot month in Granite City, Illinois, with an average temperature varying between 84.7°F (29.3°C) and 66.7°F (19.3°C). The onset of August manifests an average high-temperature of a warm 84.7°F (29.3°C), demonstrating a minor variation from the preceding month. Weather in August »
Weather in September
September, the first month of the autumn in Granite City, is also a moderately hot month, with an average temperature ranging between max 79.3°F (26.3°C) and min 59.9°F (15.5°C). The arrival of September corresponds with a minor reduction in the average high-temperature, down from August's warm 84.7°F (29.3°C) to a still moderately hot 79.3°F (26.3°C). Weather in September »
Weather in October
October, like September, in Granite City, Illinois, is another comfortable autumn month, with temperature in the range of an average high of 66.2°F (19°C) and an average low of 49.3°F (9.6°C). October weather is marked by a drop in the average high-temperature, falling from a warm 79.3°F (26.3°C) in September to an enjoyable 66.2°F (19°C). Weather in October »
Weather in November
The last month of the autumn, November, is also a fresh month in Granite City, Illinois, with temperature in the range of an average high of 52.9°F (11.6°C) and an average low of 37.9°F (3.3°C). The transition into November involves a decrease in the average high-temperature, falling from a refreshing 66.2°F (19°C) in October to a cool 52.9°F (11.6°C). Weather in November »
Weather in December
The first month of the winter, December, is also an icy month in Granite City, Illinois, with an average temperature varying between 41.9°F (5.5°C) and 30.2°F (-1°C). The transition into December involves a decrease in the average high-temperature, falling from a cool 52.9°F (11.6°C) in November to a wintry 41.9°F (5.5°C). Weather in December »
Updated: Aug 15, 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?
With average temperatures fluctuating between a high of 37.2°F (2.9°C) and a low of 24.3°F (-4.3°C), January stands out as the coldest month.
How many days does it rain in Granite City?
In Granite City, Illinois, during the entire year, the rain falls for 159.5 days and collects up to 36.06" (916mm) of precipitation.
When does it snow?
Months with snowfall are January through March, November and December.
How much does it snow?
Throughout the year, there are 20.3 snowfall days, and 8.07" (205mm) of snow is accumulated.
What is the month with the least sunshine?
January has the least sunshine of the year, with an average of 4.6h of sunshine.
What is the month with the lowest UV index?
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.
What is the driest month?
The month with the least rainfall in Granite City is February, when the rain falls for 8.8 days and typically collects 1.93" (49mm) of precipitation.
When does it snow the most?
The month with the most snowfall is February, when snow falls for 5.8 days and typically aggregates up to 2.4" (61mm) of snow.
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 in Granite City?
April through October are months without snowfall.
What is the most humid month?
The most humid month in Granite City is May, with an average relative humidity of 78%.
What is the rainiest month?
The month with the most rainfall is May, when the rain falls for 17.8 days and typically aggregates up to 4.21" (107mm) of precipitation.
What are the months with the highest UV index?
May through August, with an average maximum UV index of 6, are months with the highest UV index.
When are the longest days?
With an average of 14h and 48min of daylight, June has the longest days of the year.
What month has the most sunshine?
The month with the most sunshine is June, with an average of 10.5h of sunshine.
What part of the year is the hottest?
Granite City's July weather, marked by an average high temperature of 86.2°F (30.1°C) and an average low temperature of 68.5°F (20.3°C), is the warmest in the year.
What is the least humid month?
October is the least humid month, with an average relative humidity of 71%.
What is the month with the shortest days?
The month with the shortest days is December, with an average of 9h and 30min of daylight.
Average temperature
Granite City, IL
The warmest month (with the highest average high temperature) is July (86.2°F).
The month with the lowest average high temperature is January (37.2°F).
The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).
Average pressure
Granite City, 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:
29.92"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:
30.03"Hg - Average pressure in November:
30.12"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 (29.92"Hg).
Average wind speed
Granite City, IL
- Average wind speed in January:
9.4mph - Average wind speed in February:
9.3mph - Average wind speed in March:
9.1mph - Average wind speed in April:
9mph - Average wind speed in May:
7.3mph - Average wind speed in June:
6.5mph
- Average wind speed in July:
5.5mph - Average wind speed in August:
5.6mph - Average wind speed in September:
6.1mph - Average wind speed in October:
7.9mph - Average wind speed in November:
8.5mph - Average wind speed in December:
8.7mph
The windiest month (with the highest average wind speed) is January (9.4mph).
The calmest month (with the lowest average wind speed) is July (5.5mph).
Average humidity
Granite City, IL
The month with the highest relative humidity is May (78%).
The month with the lowest relative humidity is October (71%).
Average rainfall
Granite City, IL
- Average rainfall in January:
2.2" - Average rainfall in February:
1.93" - Average rainfall in March:
2.68" - Average rainfall in April:
4.06" - Average rainfall in May:
4.21" - Average rainfall in June:
4.09"
- Average rainfall in July:
3.58" - Average rainfall in August:
3.82" - Average rainfall in September:
2.28" - Average rainfall in October:
2.83" - Average rainfall in November:
2.05" - Average rainfall in December:
2.32"
The wettest month (with the highest rainfall) is May (4.21").
The driest month (with the least rainfall) is February (1.93").
Average rainfall days
Granite City, IL
- Average rainfall days in January:
8.4 days - Average rainfall days in February:
8.8 days - Average rainfall days in March:
14.4 days - Average rainfall days in April:
16.1 days - Average rainfall days in May:
17.8 days - Average rainfall days in June:
16.8 days
- Average rainfall days in July:
17.8 days - Average rainfall days in August:
15.3 days - Average rainfall days in September:
13.5 days - Average rainfall days in October:
11.2 days - Average rainfall days in November:
10.2 days - Average rainfall days in December:
9.2 days
The months with the highest number of rainy days are May and July (17.8 days).
The month with the least rainy days is January (8.4 days).
Average snowfall
Granite City, IL
The month with the highest snowfall is February (2.4").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days
Granite City, IL
- Average snowfall days in January:
6.3 days - Average snowfall days in February:
5.8 days - Average snowfall days in March:
2.3 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:
0.1 days - Average snowfall days in November:
1.5 days - Average snowfall days in December:
4 days
The month with the highest number of snowfall days is January (6.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Granite City, 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 4min - Average sunshine in February:
4h and 4min - Average sunshine in March:
6h and 3min - Average sunshine in April:
8h and 4min - Average sunshine in May:
9h and 3min - Average sunshine in June:
10h and 3min
- Average sunshine in July:
10h and 2min - Average sunshine in August:
10h and 1min - Average sunshine in September:
9h and 3min - Average sunshine in October:
6h and 1min - Average sunshine in November:
5h and 4min - Average sunshine in December:
4h and 5min
The month with the most sunshine is June (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).
Average sunshine days
Granite City, IL
- Average sunshine days in January:
17.2 days - Average sunshine days in February:
14.1 days - Average sunshine days in March:
13.8 days - Average sunshine days in April:
11.8 days - Average sunshine days in May:
10.7 days - Average sunshine days in June:
10.1 days
- Average sunshine days in July:
10.3 days - Average sunshine days in August:
12.5 days - Average sunshine days in September:
13.9 days - Average sunshine days in October:
17.6 days - Average sunshine days in November:
17.5 days - Average sunshine days in December:
18 days
The month with the most sunshine days is December (18 days).
The month with the least sunshine days is June (10.1 days).
Average UV index
Granite City, 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
Granite City, IL
The month with the most cloud cover is January (Cloud cover 50).
The months with the least cloud cover are June and August (Cloud cover 28).
Average visibility
Granite City, 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).
Granite City, Illinois, USA
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