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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 Rock City, Illinois, with an average temperature varying between 25.2°F (-3.8°C) and 13.1°F (-10.5°C). In Rock City, January records the lowest average temperatures, peaking at 25.2°F (-3.8°C) and reaching a low of 13.1°F (-10.5°C). Weather in January »
Weather in February
The last month of the winter, February, is another freezing cold month in Rock City, Illinois, with an average temperature fluctuating between 29.5°F (-1.4°C) and 16.7°F (-8.5°C). At the onset of February, Rock City records an average high-temperature of a still subzero cold 29.5°F (-1.4°C), showing little deviation from the preceding month. Weather in February »
Weather in March
March, the first month of the spring in Rock City, is a frosty month, with an average temperature fluctuating between 43.9°F (6.6°C) and 28.9°F (-1.7°C). As Rock City transitions into March, the average high-temperature shows a marked escalation, increasing from a freezing cold 29.5°F (-1.4°C) in February to a frosty 43.9°F (6.6°C). Weather in March »
Weather in April
April is a moderate spring month in Rock City, Illinois, with an average temperature varying between 55.9°F (13.3°C) and 39.2°F (4°C). Rock City's weather shows a temperature rise with the arrival of April, moving from a chilly 43.9°F (6.6°C) in March to a moderate 55.9°F (13.3°C). Weather in April »
Weather in May
May, the last month of the spring in Rock City, is a pleasant month, with an average temperature fluctuating between 68°F (20°C) and 50.9°F (10.5°C). With the onset of May, Rock City's average high-temperature experiences a rise, moving from April's mild 55.9°F (13.3°C) to an agreeable 68°F (20°C). Weather in May »
Weather in June
The first month of the summer, June, is a warm month in Rock City, Illinois, with an average temperature fluctuating between 59.5°F (15.3°C) and 76.6°F (24.8°C). The beginning of June marks a minor shift in the average high-temperature, moving from May's pleasant 68°F (20°C) to a warm 76.6°F (24.8°C). Weather in June »
Weather in July
July, the same as June, is a moderately hot summer month in Rock City, Illinois, with temperature in the range of an average high of 79.7°F (26.5°C) and an average low of 62.8°F (17.1°C). Rock City's warmest temperatures are experienced in July, with average high temperatures of 79.7°F (26.5°C) and lows of 62.8°F (17.1°C). Weather in July »
Weather in August
August, the last month of the summer in Rock City, is another warm month, with an average temperature varying between 60.8°F (16°C) and 78.3°F (25.7°C). Rock City in August witnesses an average high-temperature of a still moderately hot 78.3°F (25.7°C), indicating a slight variation from July's 79.7°F (26.5°C). Weather in August »
Weather in September
The first month of the autumn, September, is also an agreeable month in Rock City, Illinois, with an average temperature ranging between max 72.7°F (22.6°C) and min 54°F (12.2°C). The shift from August to September includes a minor decrease in the average high-temperature, lightly dropping from a moderately hot 78.3°F (25.7°C) to a pleasant 72.7°F (22.6°C). Weather in September »
Weather in October
October, the same as September, in Rock City, Illinois, is another refreshing autumn month, with an average temperature ranging between max 58.8°F (14.9°C) and min 43°F (6.1°C). Rock City's October weather comes with a decrease in average high-temperatures, moving from an agreeable 72.7°F (22.6°C) in September to a refreshing 58.8°F (14.9°C). Weather in October »
Weather in November
November, the last month of the autumn in Rock City, is another chilly month, with an average temperature ranging between min 30.9°F (-0.6°C) and max 43.9°F (6.6°C). A decrease in the average high-temperature marks November, falling from October's mild 58.8°F (14.9°C) to a frosty 43.9°F (6.6°C). Weather in November »
Weather in December
December, the first month of the winter in Rock City, is also a wintry month, with an average temperature varying between 32°F (0°C) and 21.6°F (-5.8°C). Onset of December witnesses a reduction in the average high-temperature, falling from a frosty 43.9°F (6.6°C) in November to a cold 32°F (0°C). Weather in December »
Updated: Jun 19, 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 month is the coldest?
January is the coldest month, with an average high-temperature of 25.2°F (-3.8°C) and an average low-temperature of 13.1°F (-10.5°C).
What is the most humid month?
January is the most humid month, with an average relative humidity of 87%.
How much does it rain in Rock City?
In Rock City, during the entire year, the rain falls for 138 days and collects up to 19.69" (500mm) of precipitation.
When does it snow?
Months with snowfall are January through April, October through December.
When does it snow the most?
The month with the most snowfall is January, when snow falls for 11.3 days and typically aggregates up to 2.99" (76mm) of snow.
How much does it snow?
In Rock City, during the entire year, snow falls for 41.8 days and aggregates up to 10.43" (265mm) of snow.
What is the month with the least sunshine?
The month with the least sunshine is January, with an average of 3.6h of sunshine.
What is the month with the lowest UV index?
January and December, with an average maximum UV index of 1, are months with the lowest UV index.
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 Rock City, snow does not fall in May through September.
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 5.
What is the rainiest month in Rock City?
June is the month with the most rainfall. Rain falls for 16.8 days and accumulates 2.87" (73mm) of precipitation.
When are the longest days?
With an average of 15h and 12min of daylight, June has the longest days of the year.
What month is the hottest?
July, known for its average high temperature of 79.7°F (26.5°C) and an average low temperature of 62.8°F (17.1°C), is the warmest month.
What is the month with the most sunshine?
The months with the most sunshine are July and August, with an average of 9.7h of sunshine.
What is the least humid month?
With an average relative humidity of 75%, October is the least humid month.
What is the driest month?
The month with the least rainfall is December, when the rain falls for 6.8 days and typically collects 0.83" (21mm) of precipitation.
What is the month with the shortest days?
With an average of 9h and 6min of daylight, December has the shortest days of the year.
Average temperature
Rock City, IL
The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is January (25.2°F).
The month with the highest average low temperature is July (62.8°F).
The coldest month (with the lowest average low temperature) is January (13.1°F).
Average pressure
Rock City, IL
- Average pressure in January:
30.12"Hg - Average pressure in February:
30.11"Hg - Average pressure in March:
30.09"Hg - Average pressure in April:
29.95"Hg - Average pressure in May:
29.96"Hg - Average pressure in June:
29.91"Hg
- Average pressure in July:
29.96"Hg - Average pressure in August:
29.97"Hg - Average pressure in September:
30.03"Hg - Average pressure in October:
30"Hg - Average pressure in November:
30.09"Hg - Average pressure in December:
30.1"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed
Rock City, IL
- Average wind speed in January:
9.8mph - Average wind speed in February:
9.9mph - Average wind speed in March:
9.8mph - Average wind speed in April:
10.3mph - Average wind speed in May:
8.8mph - Average wind speed in June:
7.5mph
- Average wind speed in July:
6.6mph - Average wind speed in August:
6.5mph - Average wind speed in September:
7.5mph - Average wind speed in October:
9.1mph - Average wind speed in November:
9.8mph - Average wind speed in December:
9.4mph
The windiest month (with the highest average wind speed) is April (10.3mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).
Average humidity
Rock City, IL
The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is October (75%).
Average rainfall
Rock City, IL
- Average rainfall in January:
0.91" - Average rainfall in February:
0.87" - Average rainfall in March:
1.06" - Average rainfall in April:
2.17" - Average rainfall in May:
2.6" - Average rainfall in June:
2.87"
- Average rainfall in July:
2.2" - Average rainfall in August:
1.69" - Average rainfall in September:
1.46" - Average rainfall in October:
1.89" - Average rainfall in November:
1.14" - Average rainfall in December:
0.83"
The wettest month (with the highest rainfall) is June (2.87").
The driest month (with the least rainfall) is December (0.83").
Average rainfall days
Rock City, IL
- Average rainfall days in January:
4.9 days - Average rainfall days in February:
5 days - Average rainfall days in March:
11.4 days - Average rainfall days in April:
14.2 days - Average rainfall days in May:
17.4 days - Average rainfall days in June:
16.8 days
- Average rainfall days in July:
16.3 days - Average rainfall days in August:
14.2 days - Average rainfall days in September:
11.3 days - Average rainfall days in October:
11.2 days - Average rainfall days in November:
8.5 days - Average rainfall days in December:
6.8 days
The month with the highest number of rainy days is May (17.4 days).
The month with the least rainy days is January (4.9 days).
Average snowfall
Rock City, IL
The month with the highest snowfall is January (2.99").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Rock City, IL
- Average snowfall days in January:
11.3 days - Average snowfall days in February:
10.7 days - Average snowfall days in March:
5.5 days - Average snowfall days in April:
2.1 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:
0.5 days - Average snowfall days in November:
3.5 days - Average snowfall days in December:
8.2 days
The month with the highest number of snowfall days is January (11.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Rock City, IL
- Average daylight in January:
9h and 3min - 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 4min - 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 0min - Average daylight in November:
9h and 5min - Average daylight in December:
9h and 1min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in January:
3h and 4min - Average sunshine in February:
3h and 5min - Average sunshine in March:
6h and 1min - Average sunshine in April:
7h and 3min - Average sunshine in May:
8h and 2min - Average sunshine in June:
9h and 3min
- Average sunshine in July:
9h and 4min - Average sunshine in August:
9h and 4min - Average sunshine in September:
8h and 5min - Average sunshine in October:
5h and 2min - Average sunshine in November:
5h and 0min - Average sunshine in December:
4h and 0min
The months with the most sunshine are July and August (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days
Rock City, IL
- Average sunshine days in January:
16.3 days - Average sunshine days in February:
14.1 days - Average sunshine days in March:
15.3 days - Average sunshine days in April:
12.3 days - Average sunshine days in May:
11.3 days - Average sunshine days in June:
10.5 days
- Average sunshine days in July:
10.7 days - Average sunshine days in August:
13.2 days - Average sunshine days in September:
16.9 days - Average sunshine days in October:
16.5 days - Average sunshine days in November:
17.7 days - Average sunshine days in December:
16.7 days
The month with the most sunshine days is November (17.7 days).
The month with the least sunshine days is June (10.5 days).
Average UV index
Rock City, IL
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover
Rock City, IL
The month with the most cloud cover is January (Cloud cover 63).
The month with the least cloud cover is September (Cloud cover 32).
Average visibility
Rock City, IL
The months with the highest visibility are March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, February, July and August (5mi).
Rock City, Illinois, USA
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