Climate and monthly weather forecastRiver Grove, IL
Climate and monthly weather forecast
Weather in January
January, like December, is another subzero cold winter month in River Grove, Illinois, with an average temperature varying between 19.4°F (-7°C) and 28.9°F (-1.7°C). January tends to be the coldest month, with temperatures averaging a daily high of 28.9°F (-1.7°C) and a low of 19.4°F (-7°C). Weather in January »Weather in February
The last month of the winter, February, is a cold month in River Grove, Illinois, with an average temperature varying between 32.4°F (0.2°C) and 21.9°F (-5.6°C). With the onset of February, River Grove's average high-temperature clocks in at a cold 32.4°F (0.2°C), showing a minor fluctuation from the previous month. Weather in February »Weather in March
The first month of the spring, March, is a frosty month in River Grove, Illinois, with an average temperature varying between 32.2°F (0.1°C) and 43.2°F (6.2°C). As February gives way to March, the average high-temperature displays an increase, moving from a wintry 32.4°F (0.2°C) to a frosty 43.2°F (6.2°C). Weather in March »Weather in April
April is a fresh spring month in River Grove, Illinois, with an average temperature ranging between max 53.2°F (11.8°C) and min 40.5°F (4.7°C). An increase in the average high-temperature marks April, moving from March's frosty 43.2°F (6.2°C) to a cool 53.2°F (11.8°C). Weather in April »Weather in May
The last month of the spring, May, is an enjoyable month in River Grove, Illinois, with temperature in the range of an average low of 51.4°F (10.8°C) and an average high of 64.4°F (18°C). The start of May brings a rise in the average high-temperature, moving from a fresh 53.2°F (11.8°C) in April to an enjoyable 64.4°F (18°C). Weather in May »Weather in June
The first month of the summer, June, is a moderately hot month in River Grove, Illinois, with temperature in the range of an average high of 73.9°F (23.3°C) and an average low of 61.2°F (16.2°C). June brings a temperature change, with average high-temperatures moving from May's enjoyable 64.4°F (18°C) to a warm 73.9°F (23.3°C). Weather in June »Weather in July
July, like June, in River Grove, Illinois, is another warm summer month, with an average temperature fluctuating between 67.5°F (19.7°C) and 79.7°F (26.5°C). The warmest temperatures occur during July, when averages reach a peak of 79.7°F (26.5°C) and a low of 67.5°F (19.7°C). Weather in July »Weather in August
The last month of the summer, August, is another warm month in River Grove, Illinois, with an average temperature fluctuating between 79.3°F (26.3°C) and 66.7°F (19.3°C). River Grove's weather in August displays an average high-temperature of a still moderately hot 79.3°F (26.3°C), showing minor disparity from July's 79.7°F (26.5°C). Weather in August »Weather in September
September, the first month of the autumn in River Grove, is still a pleasant month, with an average temperature fluctuating between 72.1°F (22.3°C) and 60.4°F (15.8°C). Start of September brings a slight shift in the average high-temperature, dipping a bit from August's warm 79.3°F (26.3°C) to a pleasant 72.1°F (22.3°C). Weather in September »Weather in October
October, like September, is another mild autumn month in River Grove, Illinois, with temperature in the range of an average low of 47.8°F (8.8°C) and an average high of 59.9°F (15.5°C). In the transition to October, River Grove observes a drop in the average high-temperature, moving from a pleasant 72.1°F (22.3°C) in September to a mild 59.9°F (15.5°C). Weather in October »Weather in November
The last month of the autumn, November, is another chilly month in River Grove, Illinois, with an average temperature ranging between max 45.9°F (7.7°C) and min 35.4°F (1.9°C). November's onset brings a reduction in the average high-temperature, from a refreshing 59.9°F (15.5°C) in October to a chilly 45.9°F (7.7°C). Weather in November »Weather in December
The first month of the winter, December, is also a wintry month in River Grove, Illinois, with temperature in the range of an average low of 26.6°F (-3°C) and an average high of 35.1°F (1.7°C). As River Grove enters December, the average high-temperature decreases from the a frosty 45.9°F (7.7°C) of November to a wintry 35.1°F (1.7°C). Weather in December »Updated: Feb 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
River Grove's coldest month, January, registers temperatures that range from a high of 28.9°F (-1.7°C) to a low of 19.4°F (-7°C).
With an average relative humidity of 82%, January is the most humid month in River Grove, Illinois.
In River Grove, Illinois, during the entire year, the rain falls for 157.8 days and collects up to 33.7" (856mm) of precipitation.
Months with snowfall in River Grove, Illinois, are January through May, October through December.
In River Grove, Illinois, during the entire year, snow falls for 40.3 days and aggregates up to 16.81" (427mm) of snow.
The month with the least sunshine is January, with an average of 3.7h of sunshine.
The months with the lowest UV index in River Grove, Illinois, are January and December, with an average maximum UV index of 1.
The month with the most snowfall in River Grove is February, when snow falls for 10.2 days and typically aggregates up to 4.69" (119mm) of snow.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in River Grove, Illinois, 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.
The month with the most rainfall is May, when the rain falls for 18.8 days and typically aggregates up to 4.49" (114mm) of precipitation.
June through September are months without snowfall.
June has the longest days of the year, with an average of 15h and 12min of daylight.
June through August, with an average maximum UV index of 6, are months with the highest UV index in River Grove, Illinois.
During the warmest month in River Grove, July, temperatures average a high of 79.7°F (26.5°C) and a low of 67.5°F (19.7°C).
With an average of 10.6h of sunshine, August has the most sunshine of the year in River Grove.
With an average relative humidity of 72%, October is the least humid month.
The month with the least rainfall in River Grove, Illinois, is December, when the rain falls for 8.2 days and typically collects 1.57" (40mm) of precipitation.
With an average of 9h and 12min of daylight, December has the shortest days of the year in River Grove.
Average temperature
River Grove, 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 (28.9°F).
The month with the highest average low temperature is July (67.5°F).
The coldest month (with the lowest average low temperature) is January (19.4°F).
Average pressure
River Grove, IL
- Average pressure in January:
30.11"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:
30.09"Hg - Average pressure in December:
30.09"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed
River Grove, IL
- Average wind speed in January:
11.1mph - Average wind speed in February:
10.7mph - Average wind speed in March:
10.1mph - Average wind speed in April:
10.3mph - Average wind speed in May:
8.7mph - Average wind speed in June:
7.8mph
- Average wind speed in July:
7mph - Average wind speed in August:
7mph - Average wind speed in September:
8.3mph - Average wind speed in October:
10.1mph - Average wind speed in November:
10.7mph - Average wind speed in December:
10.4mph
The windiest month (with the highest average wind speed) is January (11.1mph).
The calmest months (with the lowest average wind speed) are July and August (7mph).
Average humidity
River Grove, IL
The month with the highest relative humidity is January (82%).
The month with the lowest relative humidity is October (72%).
Average rainfall
River Grove, IL
- Average rainfall in January:
1.69" - Average rainfall in February:
1.73" - Average rainfall in March:
2.01" - Average rainfall in April:
3.62" - Average rainfall in May:
4.49" - Average rainfall in June:
4.29"
- Average rainfall in July:
3.74" - Average rainfall in August:
3.5" - Average rainfall in September:
2.72" - Average rainfall in October:
2.68" - Average rainfall in November:
1.65" - Average rainfall in December:
1.57"
The wettest month (with the highest rainfall) is May (4.49").
The driest month (with the least rainfall) is December (1.57").
Average rainfall days
River Grove, IL
- Average rainfall days in January:
6.5 days - Average rainfall days in February:
5.1 days - Average rainfall days in March:
11.9 days - Average rainfall days in April:
16.8 days - Average rainfall days in May:
18.8 days - Average rainfall days in June:
17.8 days
- Average rainfall days in July:
18.5 days - Average rainfall days in August:
16.4 days - Average rainfall days in September:
14.5 days - Average rainfall days in October:
13.6 days - Average rainfall days in November:
9.7 days - Average rainfall days in December:
8.2 days
The month with the highest number of rainy days is May (18.8 days).
The month with the least rainy days is February (5.1 days).
Average snowfall
River Grove, IL
- Average snowfall in January:
4.21" - Average snowfall in February:
4.69" - Average snowfall in March:
1.26" - Average snowfall in April:
1.97" - Average snowfall in May:
0.08" - Average snowfall in June:
0"
The month with the highest snowfall is February (4.69").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
River Grove, IL
- Average snowfall days in January:
10.8 days - Average snowfall days in February:
10.2 days - Average snowfall days in March:
5.8 days - Average snowfall days in April:
1.8 days - Average snowfall days in May:
0.1 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:
3.1 days - Average snowfall days in December:
8.3 days
The month with the highest number of snowfall days is January (10.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
River Grove, IL
- Average daylight in January:
9h and 30min - Average daylight in February:
10h and 36min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 24min - Average daylight in May:
14h and 36min - Average daylight in June:
15h and 12min
- Average daylight in July:
14h and 54min - Average daylight in August:
13h and 48min - Average daylight in September:
12h and 30min - Average daylight in October:
11h and 6min - Average daylight in November:
9h and 48min - Average daylight in December:
9h and 12min
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 12min).
- Average sunshine in January:
3h and 42min - Average sunshine in February:
3h and 54min - Average sunshine in March:
6h and 6min - Average sunshine in April:
7h and 48min - Average sunshine in May:
8h and 42min - Average sunshine in June:
9h and 54min
- Average sunshine in July:
10h and 24min - Average sunshine in August:
10h and 36min - Average sunshine in September:
9h and 0min - Average sunshine in October:
5h and 48min - Average sunshine in November:
5h and 6min - Average sunshine in December:
4h and 6min
The month with the most sunshine is August (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days
River Grove, IL
- Average sunshine days in January:
14.3 days - Average sunshine days in February:
12.9 days - Average sunshine days in March:
13.8 days - Average sunshine days in April:
10.2 days - Average sunshine days in May:
10.4 days - Average sunshine days in June:
10.3 days
- Average sunshine days in July:
9.9 days - Average sunshine days in August:
11.8 days - Average sunshine days in September:
13.4 days - Average sunshine days in October:
15.1 days - Average sunshine days in November:
16.3 days - Average sunshine days in December:
16.7 days
The month with the most sunshine days is December (16.7 days).
The month with the least sunshine days is July (9.9 days).
Average UV index
River Grove, IL
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover
River Grove, IL
The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility
River Grove, 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).
