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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 Green Rock, Illinois, with an average temperature fluctuating between 15.4°F (-9.2°C) and 28.2°F (-2.1°C). With average high temperatures of 28.2°F (-2.1°C) and lows of 15.4°F (-9.2°C), January is the coldest month. Weather in January »
Weather in February
February, the last month of the winter in Green Rock, is a cold month, with an average temperature fluctuating between 19.6°F (-6.9°C) and 32.7°F (0.4°C). February notes an average high-temperature of an icy 32.7°F (0.4°C), subtly differing from January's 28.2°F (-2.1°C). Weather in February »
Weather in March
March, the first month of the spring in Green Rock, is a chilly month, with an average temperature varying between 32°F (0°C) and 46.8°F (8.2°C). As Green Rock enters March, the average high-temperature increases from the a wintry 32.7°F (0.4°C) of February to a frosty 46.8°F (8.2°C). Weather in March »
Weather in April
April is a refreshing spring month in Green Rock, Illinois, with an average temperature fluctuating between 59°F (15°C) and 42.4°F (5.8°C). Green Rock's weather in April presents a rise in the average high-temperature, moving from a frosty 46.8°F (8.2°C) in March to a mild 59°F (15°C). Weather in April »
Weather in May
The last month of the spring, May, is an agreeable month in Green Rock, Illinois, with an average temperature fluctuating between 53.4°F (11.9°C) and 70.3°F (21.3°C). An upsurge in temperatures occurs as April gives way to May, with average highs shifting from a refreshing 59°F (15°C) to an agreeable 70.3°F (21.3°C). Weather in May »
Weather in June
The first month of the summer, June, is a moderately hot month in Green Rock, Illinois, with an average temperature varying between 79°F (26.1°C) and 61.9°F (16.6°C). A slight uplift of average high-temperatures is noted in June, with temperatures adjusting from a pleasant 70.3°F (21.3°C) in May to a warm 79°F (26.1°C). Weather in June »
Weather in July
July, the same as June, is a moderately hot summer month in Green Rock, Illinois, with an average temperature varying between 81.7°F (27.6°C) and 64.8°F (18.2°C). July is the month that records the highest temperatures, with averages ranging from a high of 81.7°F (27.6°C) to a low of 64.8°F (18.2°C). The heat index for July is computed to be a tropical 89.6°F (32°C). Weather in July »
Weather in August
August, the last month of the summer in Green Rock, is also a moderately hot month, with an average temperature ranging between min 62.4°F (16.9°C) and max 80.6°F (27°C). With August's arrival, Green Rock notes an average high-temperature of a still moderately hot 80.6°F (27°C), closely following the trend of the preceding month. Weather in August »
Weather in September
The first month of the autumn, September, is also a moderately hot month in Green Rock, Illinois, with an average temperature fluctuating between 75.4°F (24.1°C) and 56.3°F (13.5°C). The onset of September notes an average high-temperature of a still warm 75.4°F (24.1°C), subtly shifted from August's 80.6°F (27°C). Weather in September »
Weather in October
October, the same as September, is another enjoyable autumn month in Green Rock, Illinois, with an average temperature ranging between max 61.3°F (16.3°C) and min 45°F (7.2°C). Green Rock's progression into October involves a drop in the average high-temperature, receding from a warm 75.4°F (24.1°C) in September to a refreshing 61.3°F (16.3°C). Weather in October »
Weather in November
November, the last month of the autumn in Green Rock, is also a frosty month, with an average temperature ranging between max 46.9°F (8.3°C) and min 33.3°F (0.7°C). November's arrival witnesses a distinct drop in the average high-temperature, receding from October's enjoyable 61.3°F (16.3°C) to a frosty 46.9°F (8.3°C). Weather in November »
Weather in December
The first month of the winter, December, is also a wintry month in Green Rock, Illinois, with temperature in the range of an average low of 23.9°F (-4.5°C) and an average high of 34.5°F (1.4°C). The onset of December entails a temperature shift, as the average high-temperature decreases from a chilly 46.9°F (8.3°C) in November to a cold 34.5°F (1.4°C). Weather in December »
Updated: Jul 22, 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 part of the year is the coldest?
Green Rock's coldest month, January, registers temperatures that range from a high of 28.2°F (-2.1°C) to a low of 15.4°F (-9.2°C).
What is the most humid month in Green Rock?
January and July, with an average relative humidity of 83%, are most humid months.
How much does it rain?
In Green Rock, Illinois, during the entire year, the rain falls for 99.4 days and collects up to 9.57" (243mm) of precipitation.
When does it snow?
January through April, September through December are months with snowfall.
What is the snowiest month?
January is the month with the most snowfall. Snow falls for 7.2 days and accumulates 1.26" (32mm) of snow.
How much does it snow?
Throughout the year, there are 24.5 snowfall days, and 4.09" (104mm) of snow is accumulated.
What is the month with the least sunshine?
The month with the least sunshine in Green Rock, Illinois, is January, with an average of 3.9h of sunshine.
When is the lowest UV index?
With an average maximum UV index of 1, January is the month 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.
What is the rainiest month?
The month with the most rainfall is May, when the rain falls for 13.4 days and typically aggregates up to 1.61" (41mm) of precipitation.
When it does not snow?
In Green Rock, snow does not fall in May through August.
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 warmest months?
July is the warmest month, with the temperature often reaching an average high of 81.7°F (27.6°C) and an average low of 64.8°F (18.2°C).
What month has the most sunshine in Green Rock?
The month with the most sunshine is July, with an average of 10.1h of sunshine.
When is the highest UV index?
With an average maximum UV index of 6, July is the month with the highest UV index.
What is the least humid month?
With an average relative humidity of 71%, October is the least humid month.
What is the driest month?
December is the month with the least rainfall. Rain falls for 4.1 days and accumulates 0.35" (9mm) of precipitation.
What is the month with the shortest days?
With an average of 9h and 12min of daylight, December has the shortest days of the year.
Average temperature
Green Rock, IL
The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (28.2°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 (15.4°F).
Average pressure
Green Rock, IL
- Average pressure in January:
30.13"Hg - Average pressure in February:
30.12"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.93"Hg - Average pressure in May:
29.95"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:
30.02"Hg - Average pressure in October:
30.01"Hg - Average pressure in November:
30.09"Hg - Average pressure in December:
30.11"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed
Green Rock, IL
- Average wind speed in January:
10.3mph - Average wind speed in February:
10.4mph - Average wind speed in March:
10.3mph - Average wind speed in April:
10.6mph - Average wind speed in May:
9mph - Average wind speed in June:
7.8mph
- Average wind speed in July:
6.8mph - Average wind speed in August:
6.7mph - Average wind speed in September:
7.8mph - Average wind speed in October:
9.5mph - Average wind speed in November:
10.3mph - Average wind speed in December:
9.8mph
The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest month (with the lowest average wind speed) is August (6.7mph).
Average humidity
Green Rock, IL
The months with the highest relative humidity are January and July (83%).
The month with the lowest relative humidity is October (71%).
Average rainfall
Green Rock, IL
- Average rainfall in January:
0.43" - Average rainfall in February:
0.39" - Average rainfall in March:
0.63" - Average rainfall in April:
1.02" - Average rainfall in May:
1.61" - Average rainfall in June:
1.26"
- Average rainfall in July:
1.18" - Average rainfall in August:
0.71" - Average rainfall in September:
0.75" - Average rainfall in October:
0.71" - Average rainfall in November:
0.51" - Average rainfall in December:
0.35"
The wettest month (with the highest rainfall) is May (1.61").
The driest month (with the least rainfall) is December (0.35").
Average rainfall days
Green Rock, IL
- Average rainfall days in January:
3.2 days - Average rainfall days in February:
3.3 days - Average rainfall days in March:
8.2 days - Average rainfall days in April:
11.8 days - Average rainfall days in May:
13.4 days - Average rainfall days in June:
13.1 days
- Average rainfall days in July:
11.2 days - Average rainfall days in August:
10.7 days - Average rainfall days in September:
6.9 days - Average rainfall days in October:
8.4 days - Average rainfall days in November:
5.1 days - Average rainfall days in December:
4.1 days
The month with the highest number of rainy days is May (13.4 days).
The month with the least rainy days is January (3.2 days).
Average snowfall
Green Rock, IL
The month with the highest snowfall is January (1.26").
The months with the least snowfall are May, June, July and August (0").
Average snowfall days
Green Rock, IL
- Average snowfall days in January:
7.2 days - Average snowfall days in February:
6.2 days - Average snowfall days in March:
3.1 days - Average snowfall days in April:
0.8 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:
0.1 days - Average snowfall days in October:
0.6 days - Average snowfall days in November:
1.5 days - Average snowfall days in December:
5 days
The month with the highest number of snowfall days is January (7.2 days).
The months with the least snowfall days are May, June, July and August (0 days).
Average daylight / Average sunshine
Green Rock, 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 5min - Average sunshine in February:
4h and 1min - Average sunshine in March:
6h and 2min - Average sunshine in April:
7h and 4min - Average sunshine in May:
8h and 4min - Average sunshine in June:
9h and 4min
- Average sunshine in July:
10h and 1min - Average sunshine in August:
9h and 5min - Average sunshine in September:
9h and 1min - Average sunshine in October:
5h and 3min - Average sunshine in November:
5h and 1min - Average sunshine in December:
4h and 1min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days
Green Rock, IL
- Average sunshine days in January:
22.2 days - Average sunshine days in February:
19.5 days - Average sunshine days in March:
19.8 days - Average sunshine days in April:
16.7 days - Average sunshine days in May:
14.6 days - Average sunshine days in June:
14.4 days
- Average sunshine days in July:
16.2 days - Average sunshine days in August:
17.4 days - Average sunshine days in September:
20.9 days - Average sunshine days in October:
21.3 days - Average sunshine days in November:
22.1 days - Average sunshine days in December:
22.4 days
The month with the most sunshine days is December (22.4 days).
The month with the least sunshine days is June (14.4 days).
Average UV index
Green Rock, IL
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover
Green Rock, IL
The month with the most cloud cover is January (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility
Green Rock, 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).
Green Rock, Illinois, USA
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