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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 Rockdale, Illinois, with temperature in the range of an average low of 17.4°F (-8.1°C) and an average high of 29.3°F (-1.5°C). January, noted for its average high-temperature of 29.3°F (-1.5°C) and an average low-temperature of 17.4°F (-8.1°C), is considered the coldest month. Weather in January »
Weather in February
The last month of the winter, February, is an icy month in Rockdale, Illinois, with an average temperature ranging between min 20.7°F (-6.3°C) and max 33.4°F (0.8°C). February's presence marks an average high-temperature of an icy 33.4°F (0.8°C), subtly varied from January's 29.3°F (-1.5°C). Weather in February »
Weather in March
The first month of the spring, March, is a frosty month in Rockdale, Illinois, with an average temperature fluctuating between 31.8°F (-0.1°C) and 46.2°F (7.9°C). The transition from February to March brings a temperature rise, with average high-temperatures increasing from an icy 33.4°F (0.8°C) to a chilly 46.2°F (7.9°C). Weather in March »
Weather in April
April is a refreshing spring month in Rockdale, Illinois, with an average temperature fluctuating between 58.1°F (14.5°C) and 41.7°F (5.4°C). The arrival of April signals an increase in the average high-temperature, moving from a frosty 46.2°F (7.9°C) in March to a moderate 58.1°F (14.5°C). Weather in April »
Weather in May
The last month of the spring, May, is an agreeable month in Rockdale, Illinois, with an average temperature ranging between max 70.3°F (21.3°C) and min 52.3°F (11.3°C). Rockdale in May shows a temperature shift, moving from an average high of a refreshing 58.1°F (14.5°C) in April to an agreeable 70.3°F (21.3°C). Weather in May »
Weather in June
June, the first month of the summer in Rockdale, is a moderately hot month, with an average temperature ranging between max 79.2°F (26.2°C) and min 61.3°F (16.3°C). As May transitions into June, a subtle temperature shift is observed, with average highs adjusting from an agreeable 70.3°F (21.3°C) to a warm 79.2°F (26.2°C). Weather in June »
Weather in July
July, the same as June, is a moderately hot summer month in Rockdale, Illinois, with an average temperature varying between 64.8°F (18.2°C) and 81.3°F (27.4°C). Rockdale's July weather, with an average high temperature of 81.3°F (27.4°C) and an average low temperature of 64.8°F (18.2°C), tends to be the warmest of the year. The heat index for July is evaluated at a tropical 87.8°F (31°C). Weather in July »
Weather in August
August, the last month of the summer in Rockdale, is another warm month, with an average temperature fluctuating between 80.1°F (26.7°C) and 62.8°F (17.1°C). August brings an average high-temperature of a still moderately hot 80.1°F (26.7°C), showing a slight difference from July's 81.3°F (27.4°C). Weather in August »
Weather in September
The first month of the autumn, September, is still a warm month in Rockdale, Illinois, with an average temperature varying between 56.7°F (13.7°C) and 74.7°F (23.7°C). Rockdale's transition into September involves a gentle shift in temperature, receding from a warm 80.1°F (26.7°C) in August to a still moderately hot 74.7°F (23.7°C). Weather in September »
Weather in October
October, the same as September, is another enjoyable autumn month in Rockdale, Illinois, with an average temperature ranging between min 45.5°F (7.5°C) and max 61.3°F (16.3°C). October implies a gentle temperature shift, with average high-temperatures reducing from September's warm 74.7°F (23.7°C) to a refreshing 61.3°F (16.3°C). Weather in October »
Weather in November
November, the last month of the autumn in Rockdale, is another chilly month, with an average temperature varying between 47.1°F (8.4°C) and 33.4°F (0.8°C). The onset of November coincides with a reduction in the average high-temperature, falling from a comfortable 61.3°F (16.3°C) in October to a chilly 47.1°F (8.4°C). Weather in November »
Weather in December
December, the first month of the winter in Rockdale, is still a cold month, with an average temperature ranging between min 25°F (-3.9°C) and max 35.1°F (1.7°C). A shift in Rockdale's weather is observed as November turns into December, with the average high temperature reducing from a chilly 47.1°F (8.4°C) to a cold 35.1°F (1.7°C). Weather in December »
Updated: Jul 12, 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?
Rockdale's coldest weather arrives in January, when temperatures average a high of 29.3°F (-1.5°C) and a low of 17.4°F (-8.1°C).
How much does it rain?
In Rockdale, during the entire year, the rain falls for 153.6 days and collects up to 32.72" (831mm) of precipitation.
When does it snow?
January through April, November and December are months with snowfall in Rockdale, Illinois.
When does it snow the most?
January is the month with the most snowfall. Snow falls for 11.9 days and accumulates 4.33" (110mm) of snow.
How many days does it snow?
In Rockdale, during the entire year, snow falls for 38.2 days and aggregates up to 14.61" (371mm) of snow.
What is the month with the least sunshine?
With an average of 3.7h of sunshine, January has the least sunshine of the year.
When is the lowest UV index?
The months with the lowest UV index are January and December, with an average maximum UV index of 1.
What is the most humid month?
February is the most humid month, with an average relative humidity of 83%.
What is the driest month?
February is the month with the least rainfall. Rain falls for 5.7 days and accumulates 1.61" (41mm) 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?
The month with the most rainfall is May, when the rain falls for 17.8 days and typically aggregates up to 4.41" (112mm) of precipitation.
When it does not snow?
In Rockdale, snow does not fall in May through October.
When are the longest days?
June has the longest days of the year, with an average of 15h and 6min of daylight.
When is 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 Rockdale?
The temperatures reach their highest averages in July, with highs of 81.3°F (27.4°C) and lows of 64.8°F (18.2°C).
What month has the most sunshine?
August has the most sunshine of the year, with an average of 9.7h of sunshine.
What is the least humid month?
The least humid month is October, with an average relative humidity of 73%.
What is the month with the shortest days?
The month with the shortest days is December, with an average of 9h and 12min of daylight.
Average temperature
Rockdale, IL
The warmest month (with the highest average high temperature) is July (81.3°F).
The month with the lowest average high temperature is January (29.3°F).
The month with the highest average low temperature is July (64.8°F).
The coldest month (with the lowest average low temperature) is January (17.4°F).
Average pressure
Rockdale, IL
- Average pressure in January:
30.12"Hg - Average pressure in February:
30.1"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:
29.92"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:
30.1"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 (29.92"Hg).
Average wind speed
Rockdale, IL
- Average wind speed in January:
9.5mph - Average wind speed in February:
9.4mph - Average wind speed in March:
9.3mph - Average wind speed in April:
9.7mph - Average wind speed in May:
8.3mph - Average wind speed in June:
7.2mph
- Average wind speed in July:
6.2mph - Average wind speed in August:
5.9mph - Average wind speed in September:
6.9mph - Average wind speed in October:
8.5mph - Average wind speed in November:
9.1mph - Average wind speed in December:
8.9mph
The windiest month (with the highest average wind speed) is April (9.7mph).
The calmest month (with the lowest average wind speed) is August (5.9mph).
Average humidity
Rockdale, IL
The month with the highest relative humidity is February (83%).
The month with the lowest relative humidity is October (73%).
Average rainfall
Rockdale, IL
- Average rainfall in January:
1.85" - Average rainfall in February:
1.61" - Average rainfall in March:
2.09" - Average rainfall in April:
3.62" - Average rainfall in May:
4.41" - Average rainfall in June:
4.02"
- Average rainfall in July:
3.46" - Average rainfall in August:
2.83" - Average rainfall in September:
2.48" - Average rainfall in October:
2.95" - Average rainfall in November:
1.69" - Average rainfall in December:
1.69"
The wettest month (with the highest rainfall) is May (4.41").
The driest month (with the least rainfall) is February (1.61").
Average rainfall days
Rockdale, IL
- Average rainfall days in January:
6.8 days - Average rainfall days in February:
5.7 days - Average rainfall days in March:
12.6 days - Average rainfall days in April:
16.3 days - Average rainfall days in May:
17.8 days - Average rainfall days in June:
17.8 days
- Average rainfall days in July:
17.9 days - Average rainfall days in August:
15.8 days - Average rainfall days in September:
12.5 days - Average rainfall days in October:
12.9 days - Average rainfall days in November:
9.4 days - Average rainfall days in December:
8.1 days
The month with the highest number of rainy days is July (17.9 days).
The month with the least rainy days is February (5.7 days).
Average snowfall
Rockdale, IL
The month with the highest snowfall is January (4.33").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days
Rockdale, IL
- Average snowfall days in January:
11.9 days - Average snowfall days in February:
9.5 days - Average snowfall days in March:
5 days - Average snowfall days in April:
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:
0.2 days - Average snowfall days in November:
2.6 days - Average snowfall days in December:
8 days
The month with the highest number of snowfall days is January (11.9 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Rockdale, 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 1min
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 12min).
- 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 3min - 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 3min - Average sunshine in October:
5h and 4min - Average sunshine in November:
5h and 1min - Average sunshine in December:
4h and 1min
The month with the most sunshine is August (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days
Rockdale, IL
- Average sunshine days in January:
14.4 days - Average sunshine days in February:
13.8 days - Average sunshine days in March:
14.6 days - Average sunshine days in April:
11.1 days - Average sunshine days in May:
11.6 days - Average sunshine days in June:
10.4 days
- Average sunshine days in July:
10.8 days - Average sunshine days in August:
11.8 days - Average sunshine days in September:
15 days - Average sunshine days in October:
16.5 days - Average sunshine days in November:
18.1 days - Average sunshine days in December:
15.9 days
The month with the most sunshine days is November (18.1 days).
The month with the least sunshine days is June (10.4 days).
Average UV index
Rockdale, 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
Rockdale, 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
Rockdale, 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).
Rockdale, Illinois, USA
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