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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 Riverdale, Illinois, is a freezing cold winter month, with an average temperature varying between 29.8°F (-1.2°C) and 19.6°F (-6.9°C). Riverdale reaches its lowest average temperatures in January, measuring 29.8°F (-1.2°C) at the peak and 19.6°F (-6.9°C) at the lowest. Weather in January »
Weather in February
The last month of the winter, February, is an icy month in Riverdale, Illinois, with an average temperature fluctuating between 22.5°F (-5.3°C) and 32.9°F (0.5°C). Riverdale experiences a subtle adjustment in high-temperatures to a cold 32.9°F (0.5°C) with the onset of February, maintaining near parity with January's 29.8°F (-1.2°C). Weather in February »
Weather in March
March, the first month of the spring in Riverdale, is a frosty month, with temperature in the range of an average high of 44.2°F (6.8°C) and an average low of 32.5°F (0.3°C). The transition to March introduces an increase in the average high-temperature, shifting from a cold 32.9°F (0.5°C) in February to a chilly 44.2°F (6.8°C). Weather in March »
Weather in April
April in Riverdale, Illinois, is a cool spring month, with an average temperature fluctuating between 54.9°F (12.7°C) and 41.4°F (5.2°C). As April arrives, a rise in the average high-temperature is observed, moving from a chilly 44.2°F (6.8°C) in March to a fresh 54.9°F (12.7°C). Weather in April »
Weather in May
The last month of the spring, May, is a refreshing month in Riverdale, Illinois, with an average temperature varying between 51.8°F (11°C) and 65.7°F (18.7°C). With the arrival of May, the average high-temperature transitions from a cool 54.9°F (12.7°C) in April to a comfortable 65.7°F (18.7°C). Weather in May »
Weather in June
The first month of the summer, June, is a warm month in Riverdale, Illinois, with an average temperature fluctuating between 61.2°F (16.2°C) and 75.7°F (24.3°C). A rise in the average high-temperature is observed during June, moving from an enjoyable 65.7°F (18.7°C) in May to a moderately hot 75.7°F (24.3°C). Weather in June »
Weather in July
July, like June, in Riverdale, Illinois, is a moderately hot summer month, with an average temperature varying between 80.1°F (26.7°C) and 66.9°F (19.4°C). Riverdale's July weather reaches an average high of 80.1°F (26.7°C) and an average low of 66.9°F (19.4°C), making it the warmest month. Weather in July »
Weather in August
August, the last month of the summer in Riverdale, is also a moderately hot month, with an average temperature fluctuating between 79.3°F (26.3°C) and 66°F (18.9°C). Riverdale, Illinois, experiences a recorded average high-temperature of a still warm 79.3°F (26.3°C) in August, closely aligned with July's 80.1°F (26.7°C). Weather in August »
Weather in September
September, the first month of the autumn in Riverdale, is also a moderately hot month, with an average temperature ranging between min 59.2°F (15.1°C) and max 73.8°F (23.2°C). As Riverdale enters September, the average high-temperature subtly lowers from the 79.3°F (26.3°C) of August to a still warm 73.8°F (23.2°C). Weather in September »
Weather in October
October, like September, is another refreshing autumn month in Riverdale, Illinois, with an average temperature ranging between min 47.7°F (8.7°C) and max 60.3°F (15.7°C). The onset of October coincides with a reduction in the average high-temperature, falling from a moderately hot 73.8°F (23.2°C) in September to a mild 60.3°F (15.7°C). Weather in October »
Weather in November
The last month of the autumn, November, is another chilly month in Riverdale, Illinois, with temperature in the range of an average high of 46.8°F (8.2°C) and an average low of 35.2°F (1.8°C). The onset of November coincides with a reduction in the average high-temperature, falling from a refreshing 60.3°F (15.7°C) in October to a chilly 46.8°F (8.2°C). Weather in November »
Weather in December
December, the first month of the winter in Riverdale, is still a cold month, with an average temperature fluctuating between 26.8°F (-2.9°C) and 35.8°F (2.1°C). Riverdale's transition into December involves a shift in temperature, receding from a chilly 46.8°F (8.2°C) in November to an icy 35.8°F (2.1°C). Weather in December »
[Resources]Frequently asked questions
What is the coldest time of year in Riverdale?
Riverdale's coldest month, January, generally records average temperatures ranging from a high of 29.8°F (-1.2°C) to a low of 19.6°F (-6.9°C).
What is the most humid month in Riverdale?
The months with the highest humidity in Riverdale, Illinois, are January and February, with an average relative humidity of 82%.
How many days does it rain in Riverdale?
Throughout the year, in Riverdale, there are 110.3 rainfall days, and 10.31" (262mm) of precipitation is accumulated.
When does it snow in Riverdale?
January through April, October through December are months with snowfall.
What is the snowiest month in Riverdale?
January is the month with the most snowfall. Snow falls for 9.3 days and accumulates 1.1" (28mm) of snow.
How much does it snow in Riverdale?
In Riverdale, Illinois, during the entire year, snow falls for 34.1 days and aggregates up to 4.13" (105mm) of snow.
What is the month with the least sunshine in Riverdale?
The month with the least sunshine is January, with an average of 3.6h of sunshine.
What is the driest month in Riverdale?
February and December are months with the least rain when the rain falls for 4.1 days and typically aggregates up to 0.47" (12mm) of rain.
When is Daylight Saving Time (DST) in Riverdale?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Riverdale, 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 in Riverdale?
The months with the most rainfall in Riverdale, Illinois, are May and June, with an average 1.38" (35mm) of precipitation.
When it does not snow in Riverdale?
May through September are months without snowfall.
When are the longest days in Riverdale?
The month with the longest days in Riverdale, Illinois, is June, with an average of 15h and 6min of daylight.
What is the month with the highest UV index in Riverdale?
June through August, with an average maximum UV index of 6, are months with the highest UV index in Riverdale.
What part of the year is the hottest in Riverdale?
The temperatures reach their highest averages in July, with highs of 80.1°F (26.7°C) and lows of 66.9°F (19.4°C).
What month has the most sunshine in Riverdale?
The month with the most sunshine in Riverdale, Illinois, is August, with an average of 10.4h of sunshine.
What is the least humid month in Riverdale?
With an average relative humidity of 72%, October is the least humid month in Riverdale.
What is the month with the shortest days in Riverdale?
With an average of 9h and 12min of daylight, December has the shortest days of the year in Riverdale.
When is the lowest UV index in Riverdale?
December is the month with the lowest UV index in Riverdale, Illinois, with an average maximum UV index of 1.
Average temperature
Riverdale, IL
The warmest month (with the highest average high temperature) is July (80.1°F).
The month with the lowest average high temperature is January (29.8°F).
The month with the highest average low temperature is July (66.9°F).
The coldest month (with the lowest average low temperature) is January (19.6°F).
Average pressure
Riverdale, IL
- Average pressure in January:
30.11"Hg - Average pressure in February:
30.09"Hg - Average pressure in March:
30.09"Hg - Average pressure in April:
29.95"Hg - Average pressure in May:
29.97"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:
30.1"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
Riverdale, IL
- Average wind speed in January:
11mph - Average wind speed in February:
10.6mph - Average wind speed in March:
10mph - Average wind speed in April:
10.3mph - Average wind speed in May:
8.6mph - Average wind speed in June:
7.7mph
- Average wind speed in July:
6.8mph - Average wind speed in August:
6.8mph - Average wind speed in September:
8mph - Average wind speed in October:
9.8mph - Average wind speed in November:
10.6mph - Average wind speed in December:
10.3mph
The windiest month (with the highest average wind speed) is January (11mph).
The calmest months (with the lowest average wind speed) are July and August (6.8mph).
Average humidity
Riverdale, IL
The months with the highest relative humidity are January and February (82%).
The month with the lowest relative humidity is October (72%).
Average rainfall
Riverdale, IL
- Average rainfall in January:
0.51" - Average rainfall in February:
0.47" - Average rainfall in March:
0.51" - Average rainfall in April:
1.1" - Average rainfall in May:
1.38" - Average rainfall in June:
1.38"
- Average rainfall in July:
1.18" - Average rainfall in August:
0.98" - Average rainfall in September:
0.91" - Average rainfall in October:
0.87" - Average rainfall in November:
0.55" - Average rainfall in December:
0.47"
The wettest months (with the highest rainfall) are May and June (1.38").
The driest months (with the least rainfall) are February and December (0.47").
Average rainfall days
Riverdale, IL
- Average rainfall days in January:
4.6 days - Average rainfall days in February:
4.1 days - Average rainfall days in March:
8.7 days - Average rainfall days in April:
11.7 days - Average rainfall days in May:
13.1 days - Average rainfall days in June:
12.9 days
- Average rainfall days in July:
14 days - Average rainfall days in August:
11 days - Average rainfall days in September:
9.8 days - Average rainfall days in October:
9 days - Average rainfall days in November:
7.2 days - Average rainfall days in December:
4.2 days
The month with the highest number of rainy days is July (14 days).
The month with the least rainy days is February (4.1 days).
Average snowfall
Riverdale, IL
The month with the highest snowfall is January (1.1").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Riverdale, IL
- Average snowfall days in January:
9.3 days - Average snowfall days in February:
8.5 days - Average snowfall days in March:
4.2 days - Average snowfall days in April:
1.4 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:
0.3 days - Average snowfall days in November:
2.9 days - Average snowfall days in December:
7.5 days
The month with the highest number of snowfall days is January (9.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Riverdale, 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 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 6min).
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 0min - Average sunshine in April:
7h and 4min - Average sunshine in May:
8h and 4min - Average sunshine in June:
9h and 5min
- Average sunshine in July:
10h and 1min - Average sunshine in August:
10h and 2min - Average sunshine in September:
8h and 5min - Average sunshine in October:
5h and 5min - Average sunshine in November:
5h and 0min - Average sunshine in December:
4h and 0min
The month with the most sunshine is August (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days
Riverdale, IL
- Average sunshine days in January:
18.3 days - Average sunshine days in February:
17.1 days - Average sunshine days in March:
18.8 days - Average sunshine days in April:
15.2 days - Average sunshine days in May:
14.3 days - Average sunshine days in June:
13.1 days
- Average sunshine days in July:
13.4 days - Average sunshine days in August:
15.6 days - Average sunshine days in September:
16.9 days - Average sunshine days in October:
18.1 days - Average sunshine days in November:
19.7 days - Average sunshine days in December:
19.8 days
The month with the most sunshine days is December (19.8 days).
The month with the least sunshine days is June (13.1 days).
Average UV index
Riverdale, IL
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover
Riverdale, IL
The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility
Riverdale, 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).
Riverdale, Illinois, USA
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