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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 temperature in the range of an average low of 19.4°F (-7°C) and an average high of 28.9°F (-1.7°C). January is the coldest month, exhibiting average temperatures of 28.9°F (-1.7°C) at the peak and 19.4°F (-7°C) at the base. Weather in January »
Weather in February
The last month of the winter, February, is a cold month in River Forest, Illinois, with temperature in the range of an average high of 32.4°F (0.2°C) and an average low of 21.9°F (-5.6°C). River Forest ushers in February with an average high-temperature of a cold 32.4°F (0.2°C), showing a close resemblance to the previous month. Weather in February »
Weather in March
March, the first month of the spring in River Forest, is a chilly month, with an average temperature fluctuating between 43.2°F (6.2°C) and 32.2°F (0.1°C). As February gives way to March, the average high-temperature displays an increase, moving from a cold 32.4°F (0.2°C) to a frosty 43.2°F (6.2°C). Weather in March »
Weather in April
April is a cool spring month in River Forest, Illinois, with temperature in the range of an average high of 53.2°F (11.8°C) and an average low of 40.5°F (4.7°C). River Forest's April weather shows an increase in high-temperatures, moving from March's frosty 43.2°F (6.2°C) to a fresh 53.2°F (11.8°C). Weather in April »
Weather in May
May, the last month of the spring in River Forest, is a comfortable month, 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). In River Forest, the average high-temperature in May increases 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
June, the first month of the summer in River Forest, is a warm 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). June brings a temperature change, with average 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, the same as June, is a moderately hot summer month in River Forest, Illinois, with temperature in the range of an average low of 67.5°F (19.7°C) and an average high of 79.7°F (26.5°C). In River Forest, Illinois, the highest average temperatures are observed in July, with a high 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 also a moderately hot month in River Forest, Illinois, with an average temperature ranging between max 79.3°F (26.3°C) and min 66.7°F (19.3°C). August's arrival brings an average high-temperature of a still warm 79.3°F (26.3°C), slightly deviating from July's 79.7°F (26.5°C). Weather in August »
Weather in September
September, the first month of the autumn in River Forest, is still a pleasant month, with an average temperature fluctuating between 60.4°F (15.8°C) and 72.1°F (22.3°C). The beginning of September brings a minor change in the average high-temperature, shifting from a warm 79.3°F (26.3°C) in August to an agreeable 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 fluctuating between 47.8°F (8.8°C) and 59.9°F (15.5°C). Arrival of October comes with a reduction in the average high-temperature, falling from a pleasant 72.1°F (22.3°C) in September to a moderate 59.9°F (15.5°C). Weather in October »
Weather in November
The last month of the autumn, November, is also a frosty month in River Forest, Illinois, with an average temperature ranging between min 35.4°F (1.9°C) and max 45.9°F (7.7°C). November is characterized by a reduction in the average high-temperature, from a mild 59.9°F (15.5°C) in October to a chilly 45.9°F (7.7°C). Weather in November »
Weather in December
December, the first month of the winter in River Forest, is also a wintry month, with an average temperature fluctuating between 35.1°F (1.7°C) and 26.6°F (-3°C). Start of December brings a shift in the average high-temperature, falling from November's frosty 45.9°F (7.7°C) to a wintry 35.1°F (1.7°C). Weather in December »
Updated: Aug 9, 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 time of the year is the coldest?
River Forest's January weather, with an average high temperature of 28.9°F (-1.7°C) and an average low temperature of 19.4°F (-7°C), tends to be the coldest of the year.
What is the most humid month?
The most humid month is January, with an average relative humidity of 82%.
How many days does it rain?
Throughout the year, there are 157.8 rainfall days, and 33.7" (856mm) of precipitation is accumulated.
When does it snow?
January through May, October through December are months with snowfall.
How much does it snow?
Throughout the year, there are 40.3 snowfall days, and 16.81" (427mm) of snow is accumulated.
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.
When does it snow the most?
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)?
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 18.8 days and typically aggregates up to 4.49" (114mm) of precipitation.
When it does not snow?
June through September are months without snowfall in River Forest.
When are the longest days?
June has the longest days of the year, with an average of 15h and 12min of daylight.
What is the month with the highest UV index?
The months with the highest UV index are June through August, with an average maximum UV index of 6.
What part of the year is the hottest?
Temperature records mark July as the warmest month, with highs averaging 79.7°F (26.5°C) and lows at 67.5°F (19.7°C).
What month has the most sunshine in River Forest?
August has the most sunshine of the year, with an average of 10.6h of sunshine.
What is the least humid month?
The least humid month is October, with an average relative humidity of 72%.
What is the driest month?
The month with the least rainfall 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?
The month with the shortest days is December, with an average of 9h and 12min of daylight.
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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