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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, the same as December, in River Forest, Illinois, is a freezing cold winter month, with an average temperature varying between 19.4°F (-7°C) and 28.9°F (-1.7°C). January, marked by an average high-temperature of 28.9°F (-1.7°C) and a low-temperature of 19.4°F (-7°C), is the coldest month. Weather in January »
Weather in February
The last month of the winter, February, is an icy month in River Forest, Illinois, with an average temperature varying between 21.9°F (-5.6°C) and 32.4°F (0.2°C). February welcomes an average high-temperature of an icy 32.4°F (0.2°C), not much different from the preceding month. Weather in February »
Weather in March
March, the first month of the spring in River Forest, is a frosty month, with an average temperature varying between 32.2°F (0.1°C) and 43.2°F (6.2°C). As River Forest enters March, the average high-temperature increases from the a cold 32.4°F (0.2°C) of February to a chilly 43.2°F (6.2°C). Weather in March »
Weather in April
April in River Forest, Illinois, is a fresh spring month, with an average temperature fluctuating between 53.2°F (11.8°C) and 40.5°F (4.7°C). As River Forest transitions into April, a rise in the average high-temperature is observed, moving from a chilly 43.2°F (6.2°C) in March to a cool 53.2°F (11.8°C). Weather in April »
Weather in May
The last month of the spring, May, is a refreshing month in River Forest, Illinois, with an average temperature fluctuating between 64.4°F (18°C) and 51.4°F (10.8°C). May's arrival signals an increase in average high-temperatures, moving from April's cool 53.2°F (11.8°C) to a refreshing 64.4°F (18°C). Weather in May »
Weather in June
June, the first month of the summer in River Forest, is a moderately hot month, 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). As June arrives, River Forest's weather shows an increase in high-temperatures, moving from May's refreshing 64.4°F (18°C) to a moderately hot 73.9°F (23.3°C). Weather in June »
Weather in July
July, like June, in River Forest, 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). July proves to be the warmest month, recording an average peak temperature of 79.7°F (26.5°C) and a minimum temperature of 67.5°F (19.7°C). Weather in July »
Weather in August
August, the last month of the summer in River Forest, is also a moderately hot month, with temperature in the range of an average low of 66.7°F (19.3°C) and an average high of 79.3°F (26.3°C). River Forest greets August with an average high-temperature of a still warm 79.3°F (26.3°C), marking a slight deviation from the preceding month. Weather in August »
Weather in September
September, the first month of the autumn in River Forest, is also an agreeable month, with temperature in the range of an average high of 72.1°F (22.3°C) and an average low of 60.4°F (15.8°C). With the onset of September, the average high-temperature subtly recedes 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, the same as September, in River Forest, Illinois, is a moderate autumn month, with an average temperature ranging between min 47.8°F (8.8°C) and max 59.9°F (15.5°C). The start of October involves a temperature drop, moving from an agreeable 72.1°F (22.3°C) in September to a refreshing 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 Forest, Illinois, with an average temperature fluctuating between 35.4°F (1.9°C) and 45.9°F (7.7°C). River Forest's weather changes with the onset of November, slightly falling from a mild 59.9°F (15.5°C) in October to a frosty 45.9°F (7.7°C). Weather in November »
Weather in December
December, the first month of the winter in River Forest, is still a cold month, with an average temperature ranging between max 35.1°F (1.7°C) and min 26.6°F (-3°C). The commencement of December involves a temperature shift, with the average high-temperature dropping from a frosty 45.9°F (7.7°C) in November to a cold 35.1°F (1.7°C). Weather in December »
[Resources]Frequently asked questions
What time of the year is the coldest in River Forest?
January, with average temperatures reaching a high of 28.9°F (-1.7°C) and a low of 19.4°F (-7°C), is the coldest month.
What is the most humid month in River Forest?
January is the most humid month in River Forest, with an average relative humidity of 82%.
How many days does it rain in River Forest?
In River Forest, during the entire year, the rain falls for 157.8 days and collects up to 33.7" (856mm) of precipitation.
When does it snow in River Forest?
Months with snowfall are January through May, October through December.
How many days does it snow in River Forest?
In River Forest, during the entire year, snow falls for 40.3 days and aggregates up to 16.81" (427mm) of snow.
What is the month with the least sunshine in River Forest?
January has the least sunshine of the year in River Forest, Illinois, with an average of 3.7h of sunshine.
What are the months with the lowest UV index in River Forest?
The months with the lowest UV index in River Forest, Illinois, are January and December, with an average maximum UV index of 1.
What is the snowiest month in River Forest?
The month with the most snowfall is February, when snow falls for 10.2 days and typically aggregates up to 4.69" (119mm) of snow.
When is Daylight Saving Time (DST) in River Forest?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in River Forest, 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.
What is the rainiest month in River Forest?
May is the month with the most rainfall in River Forest, Illinois. Rain falls for 18.8 days and accumulates 4.49" (114mm) of precipitation.
When it does not snow in River Forest?
June through September are months without snowfall in River Forest.
When are the longest days in River Forest?
With an average of 15h and 12min of daylight, June has the longest days of the year.
What is the month with the highest UV index in River Forest?
The months with the highest UV index in River Forest are June through August, with an average maximum UV index of 6.
What month is the hottest in River Forest?
With its average high temperature of 79.7°F (26.5°C) and a low of 67.5°F (19.7°C), July is regarded as the warmest month in River Forest.
What month has the most sunshine in River Forest?
August has the most sunshine of the year in River Forest, Illinois, with an average of 10.6h of sunshine.
What is the least humid month in River Forest?
The least humid month in River Forest is October, with an average relative humidity of 72%.
What is the driest month in River Forest?
The month with the least rainfall in River Forest is December, when the rain falls for 8.2 days and typically collects 1.57" (40mm) of precipitation.
What is the month with the shortest days in River Forest?
With an average of 9h and 12min of daylight, December has the shortest days of the year.
Average temperature
River Forest, 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 Forest, 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 Forest, 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 Forest, IL
The month with the highest relative humidity is January (82%).
The month with the lowest relative humidity is October (72%).
Average rainfall
River Forest, 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 Forest, 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 Forest, 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 Forest, 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 Forest, 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 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 12min).
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 5min - Average sunshine in May:
8h and 4min - Average sunshine in June:
9h and 5min
- Average sunshine in July:
10h and 2min - Average sunshine in August:
10h and 4min - Average sunshine in September:
9h and 0min - Average sunshine in October:
5h and 5min - Average sunshine in November:
5h and 1min - Average sunshine in December:
4h and 1min
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 Forest, 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 Forest, 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 Forest, 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 Forest, 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).
River Forest, Illinois, USA
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