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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, in Rockwood, Illinois, is a wintry winter month, with an average temperature varying between 26.1°F (-3.3°C) and 39.4°F (4.1°C). January, on average, is the coldest month, registering a high temperature of 39.4°F (4.1°C) and a low of 26.1°F (-3.3°C). Weather in January »
Weather in February
February, the last month of the winter in Rockwood, is a chilly month, with an average temperature ranging between min 29.5°F (-1.4°C) and max 44.1°F (6.7°C). In Rockwood, February's average high-temperature stands at a chilly 44.1°F (6.7°C), closely related to the preceding month. Weather in February »
Weather in March
The first month of the spring, March, is a fresh month in Rockwood, Illinois, with an average temperature ranging between min 38.8°F (3.8°C) and max 55°F (12.8°C). Rockwood's transition into March brings a rise in the average high-temperature, moving from a frosty 44.1°F (6.7°C) in February to a cool 55°F (12.8°C). Weather in March »
Weather in April
April is an enjoyable spring month in Rockwood, Illinois, with an average temperature varying between 66.4°F (19.1°C) and 48.2°F (9°C). In Rockwood, the onset of April comes with an increased average high-temperature, moving from March's fresh 55°F (12.8°C) to an enjoyable 66.4°F (19.1°C). Weather in April »
Weather in May
The last month of the spring, May, is a moderately hot month in Rockwood, Illinois, with an average temperature varying between 76.1°F (24.5°C) and 57.7°F (14.3°C). May comes with an increase, with the average high-temperature moving from a refreshing 66.4°F (19.1°C) in April to a warm 76.1°F (24.5°C). Weather in May »
Weather in June
June, the first month of the summer in Rockwood, is still a warm month, with an average temperature ranging between min 66°F (18.9°C) and max 85.3°F (29.6°C). A rise in the average high-temperature is observed during June, moving from a warm 76.1°F (24.5°C) in May to a still moderately hot 85.3°F (29.6°C). Weather in June »
Weather in July
July in Rockwood, Illinois, is a hot summer month, with temperature in the range of an average low of 68.5°F (20.3°C) and an average high of 87.8°F (31°C). In Rockwood, the average temperatures in July are the highest, with a peak at 87.8°F (31°C) and a low of 68.5°F (20.3°C). July's heat index is calculated to be an extremely hot 104°F (40°C). Weather in July »
Weather in August
The last month of the summer, August, is also a hot month in Rockwood, Illinois, with temperature in the range of an average low of 66°F (18.9°C) and an average high of 86.2°F (30.1°C). Stepping into August, Rockwood records an average high-temperature of a still hot 86.2°F (30.1°C), almost consistent with July. Weather in August »
Weather in September
September, the first month of the autumn in Rockwood, is also a moderately hot month, with an average temperature fluctuating between 80.1°F (26.7°C) and 59.9°F (15.5°C). The shift from August to September includes a small decrease in the average high-temperature, from a hot 86.2°F (30.1°C) to a moderately hot 80.1°F (26.7°C). Weather in September »
Weather in October
October, like September, in Rockwood, Illinois, is another enjoyable autumn month, with an average temperature fluctuating between 67.6°F (19.8°C) and 49.3°F (9.6°C). The start of October signals a decrease in the average high-temperature, transitioning from a moderately hot 80.1°F (26.7°C) in September to a comfortable 67.6°F (19.8°C). Weather in October »
Weather in November
November, the last month of the autumn in Rockwood, is also a fresh month, with an average temperature fluctuating between 38.5°F (3.6°C) and 54°F (12.2°C). In November, the average high-temperature goes from an enjoyable 67.6°F (19.8°C) in October to a fresh 54°F (12.2°C). Weather in November »
Weather in December
The first month of the winter, December, is still a chilly month in Rockwood, Illinois, with an average temperature varying between 43.9°F (6.6°C) and 31.3°F (-0.4°C). In December, the meteorological conditions alter, with the average high-temperature shifting from a cool 54°F (12.2°C) in November to a frosty 43.9°F (6.6°C). Weather in December »
Updated: Aug 2, 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?
Rockwood notes the coldest temperatures in January, with a average high of 39.4°F (4.1°C) and a low of 26.1°F (-3.3°C).
How much does it rain?
Throughout the year, there are 111.9 rainfall days, and 10.43" (265mm) of precipitation is accumulated.
When does it snow?
January through March, October through December are months with snowfall.
How many days does it snow?
In Rockwood, during the entire year, snow falls for 10.9 days and aggregates up to 1.42" (36mm) of snow.
What is the month with the least sunshine?
January and February, with an average of 4.8h of sunshine, are months with the least sunshine.
When is the lowest UV index?
January, February and December, with an average maximum UV index of 2, are months with the lowest UV index.
When does it snow the most?
February is the month with the most snowfall. Snow falls for 3.4 days and accumulates 0.59" (15mm) 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.
What is the wettest month?
The wettest months are April and May, with an average 1.22" (31mm) of rainfall.
When it does not snow?
April through September are months without snowfall in Rockwood.
What is the most humid month?
May is the most humid month, with an average relative humidity of 79%.
What is the month 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 42min of daylight, June has the longest days of the year.
What is the month with the most sunshine in Rockwood?
June and July, with an average of 10.6h of sunshine, are months with the most sunshine.
What is the warmest month?
Rockwood experiences its highest temperatures in July, with an average peak of 87.8°F (31°C) and a low of 68.5°F (20.3°C).
What is the driest month in Rockwood?
The month with the least rainfall is September, when the rain falls for 8.6 days and typically collects 0.43" (11mm) of precipitation.
What is the least humid month?
The least humid month is October, with an average relative humidity of 71%.
What is the month with the shortest days?
With an average of 9h and 36min of daylight, December has the shortest days of the year in Rockwood.
Average temperature
Rockwood, IL
The warmest month (with the highest average high temperature) is July (87.8°F).
The month with the lowest average high temperature is January (39.4°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 (26.1°F).
Average pressure
Rockwood, 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:
29.95"Hg - Average pressure in May:
29.96"Hg - Average pressure in June:
29.93"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:
30.04"Hg - Average pressure in November:
30.13"Hg - Average pressure in December:
30.14"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed
Rockwood, IL
- Average wind speed in January:
9.3mph - Average wind speed in February:
9.1mph - Average wind speed in March:
8.9mph - Average wind speed in April:
8.8mph - Average wind speed in May:
7.3mph - Average wind speed in June:
6.3mph
- Average wind speed in July:
5.5mph - Average wind speed in August:
5.5mph - Average wind speed in September:
5.9mph - Average wind speed in October:
7.6mph - Average wind speed in November:
8.3mph - Average wind speed in December:
8.6mph
The windiest month (with the highest average wind speed) is January (9.3mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).
Average humidity
Rockwood, IL
The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is October (71%).
Average rainfall
Rockwood, IL
- Average rainfall in January:
0.67" - Average rainfall in February:
0.67" - Average rainfall in March:
0.87" - Average rainfall in April:
1.22" - Average rainfall in May:
1.22" - Average rainfall in June:
1.02"
- Average rainfall in July:
1.06" - Average rainfall in August:
0.98" - Average rainfall in September:
0.43" - Average rainfall in October:
0.91" - Average rainfall in November:
0.75" - Average rainfall in December:
0.63"
The wettest months (with the highest rainfall) are April and May (1.22").
The driest month (with the least rainfall) is September (0.43").
Average rainfall days
Rockwood, IL
- Average rainfall days in January:
5.9 days - Average rainfall days in February:
6.8 days - Average rainfall days in March:
10.3 days - Average rainfall days in April:
11.3 days - Average rainfall days in May:
12.6 days - Average rainfall days in June:
11.8 days
- Average rainfall days in July:
13.4 days - Average rainfall days in August:
10.9 days - Average rainfall days in September:
8.6 days - Average rainfall days in October:
6.7 days - Average rainfall days in November:
7.1 days - Average rainfall days in December:
6.5 days
The month with the highest number of rainy days is July (13.4 days).
The month with the least rainy days is January (5.9 days).
Average snowfall
Rockwood, IL
The month with the highest snowfall is February (0.59").
The months with the least snowfall are April, May, June, July, August and September (0").
Average snowfall days
Rockwood, IL
- Average snowfall days in January:
3.7 days - Average snowfall days in February:
3.4 days - Average snowfall days in March:
0.8 days - Average snowfall days in April:
0.2 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:
0.9 days - Average snowfall days in December:
1.8 days
The month with the highest number of snowfall days is January (3.7 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Rockwood, 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 1min - Average daylight in June:
14h and 4min
- Average daylight in July:
14h and 3min - 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 4min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in January:
4h and 5min - Average sunshine in February:
4h and 5min - Average sunshine in March:
6h and 4min - Average sunshine in April:
8h and 4min - Average sunshine in May:
9h and 2min - Average sunshine in June:
10h and 4min
- Average sunshine in July:
10h and 4min - Average sunshine in August:
10h and 2min - Average sunshine in September:
9h and 2min - Average sunshine in October:
6h and 2min - Average sunshine in November:
5h and 4min - Average sunshine in December:
5h and 0min
The months with the most sunshine are June and July (Average sunshine: 10h and 36min).
The months with the least sunshine are January and February (Average sunshine: 4h and 48min).
Average sunshine days
Rockwood, IL
- Average sunshine days in January:
21.8 days - Average sunshine days in February:
17.8 days - Average sunshine days in March:
17.4 days - Average sunshine days in April:
15.8 days - Average sunshine days in May:
15.2 days - Average sunshine days in June:
14.8 days
- Average sunshine days in July:
13.5 days - Average sunshine days in August:
16.5 days - Average sunshine days in September:
18.7 days - Average sunshine days in October:
21.9 days - Average sunshine days in November:
21 days - Average sunshine days in December:
21.5 days
The month with the most sunshine days is October (21.9 days).
The month with the least sunshine days is July (13.5 days).
Average UV index
Rockwood, 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 and December (UV index 2).
Average cloud cover
Rockwood, IL
The months with the most cloud cover are January and February (Cloud cover 48).
The month with the least cloud cover is June (Cloud cover 27).
Average visibility
Rockwood, 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).
Rockwood, Illinois, USA
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