Climate and monthly weather forecastRiverdale, IL
Climate and monthly weather forecast
Weather in January
January, the same as December, in Riverdale, Illinois, is another subzero cold winter month, with an average temperature fluctuating between 19.6°F (-6.9°C) and 29.8°F (-1.2°C). With an average high-temperature of 29.8°F (-1.2°C) and an average low-temperature of 19.6°F (-6.9°C), January is the coldest month. Weather in January »Weather in February
February, the last month of the winter in Riverdale, is an icy month, with temperature in the range of an average high of 32.9°F (0.5°C) and an average low of 22.5°F (-5.3°C). Riverdale indicates an average high-temperature of an icy 32.9°F (0.5°C) in February, showing minor variation from January's 29.8°F (-1.2°C). Weather in February »Weather in March
The first month of the spring, March, is a frosty month in Riverdale, Illinois, with an average temperature ranging between max 44.2°F (6.8°C) and min 32.5°F (0.3°C). As February transitions into March, Riverdale sees a rise in the average high-temperature, moving from a cold 32.9°F (0.5°C) 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 ranging between min 41.4°F (5.2°C) and max 54.9°F (12.7°C). Riverdale's transition into April is marked by a rise in the average high-temperature, advancing from a frosty 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 an enjoyable month in Riverdale, Illinois, with temperature in the range of an average high of 65.7°F (18.7°C) and an average low of 51.8°F (11°C). Riverdale experiences a temperature shift with the start of May, with average high-temperatures moving from a fresh 54.9°F (12.7°C) in April to a refreshing 65.7°F (18.7°C). Weather in May »Weather in June
June, the first month of the summer in Riverdale, is a warm month, with an average temperature varying between 61.2°F (16.2°C) and 75.7°F (24.3°C). The arrival of June brings a temperature shift, with the average high-temperature escalating from a comfortable 65.7°F (18.7°C) in May to a warm 75.7°F (24.3°C). Weather in June »Weather in July
July, like June, in Riverdale, Illinois, is another warm summer month, with an average temperature ranging between min 66.9°F (19.4°C) and max 80.1°F (26.7°C). Riverdale experiences its highest average temperatures in July, reaching a peak of 80.1°F (26.7°C) and a minimum of 66.9°F (19.4°C). Weather in July »Weather in August
The last month of the summer, August, is also a moderately hot month in Riverdale, Illinois, with temperature in the range of an average low of 66°F (18.9°C) and an average high of 79.3°F (26.3°C). The average high-temperature during August registers at a still warm 79.3°F (26.3°C), maintaining a close resemblance to the previous month. Weather in August »Weather in September
September, the first month of the autumn in Riverdale, is still a warm month, with temperature in the range of an average high of 73.8°F (23.2°C) and an average low of 59.2°F (15.1°C). The arrival of September suggests a slight decrease in the average high-temperature, moving from a warm 79.3°F (26.3°C) in August to a still moderately hot 73.8°F (23.2°C). Weather in September »Weather in October
October, like September, is another mild autumn month in Riverdale, Illinois, with temperature in the range of an average high of 60.3°F (15.7°C) and an average low of 47.7°F (8.7°C). The shift from September to October involves a decrease in the average high-temperature, from a moderately hot 73.8°F (23.2°C) to a refreshing 60.3°F (15.7°C). Weather in October »Weather in November
November, the last month of the autumn in Riverdale, is also a frosty month, with an average temperature varying between 46.8°F (8.2°C) and 35.2°F (1.8°C). During Riverdale's transition into November, the average high-temperature lessens, moving from a mild 60.3°F (15.7°C) in October to a chilly 46.8°F (8.2°C). Weather in November »Weather in December
The first month of the winter, December, is also an icy month in Riverdale, Illinois, with temperature in the range of an average low of 26.8°F (-2.9°C) and an average high of 35.8°F (2.1°C). In December, the meteorological conditions alter, with the average high-temperature shifting from a frosty 46.8°F (8.2°C) in November to a cold 35.8°F (2.1°C). Weather in December »Updated: Jun 24, 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
With average high and low temperatures of 29.8°F (-1.2°C) and 19.6°F (-6.9°C) respectively, January is Riverdale's coldest month.
The months with the highest humidity are January and February, with an average relative humidity of 82%.
Throughout the year, in Riverdale, there are 110.3 rainfall days, and 10.31" (262mm) of precipitation is accumulated.
Months with snowfall are January through April, October through December.
January is the month with the most snowfall. Snow falls for 9.3 days and accumulates 1.1" (28mm) of snow.
Throughout the year, there are 34.1 snowfall days, and 4.13" (105mm) of snow is accumulated.
January has the least sunshine of the year, with an average of 3.6h of sunshine.
The months with the least rainfall are February and December Rain falls for 4.1 days and accumulates 0.47" (12mm) of rain.
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.
The months with the most rainfall are May and June, with an average 1.38" (35mm) of precipitation.
In Riverdale, snow does not fall in May through September.
With an average of 15h and 6min of daylight, June has the longest days of the year.
June through August, with an average maximum UV index of 6, are months with the highest UV index.
In Riverdale, Illinois, temperatures reach their average annual highs in July, measuring 80.1°F (26.7°C) and a minimum average of 66.9°F (19.4°C).
August has the most sunshine of the year, with an average of 10.4h of sunshine.
With an average relative humidity of 72%, October is the least humid month.
December has the shortest days of the year, with an average of 9h and 12min of daylight.
The month with the lowest UV index is December, 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 36min - 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 6min
- Average daylight in July:
14h and 48min - 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 54min - Average daylight in December:
9h and 12min
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 36min - Average sunshine in February:
3h and 54min - Average sunshine in March:
6h and 0min - Average sunshine in April:
7h and 36min - Average sunshine in May:
8h and 42min - Average sunshine in June:
9h and 48min
- Average sunshine in July:
10h and 12min - Average sunshine in August:
10h and 24min - Average sunshine in September:
8h and 54min - Average sunshine in October:
5h and 54min - 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).
