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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, like December, in Riley, Indiana, is a wintry winter month, with an average temperature fluctuating between 34.3°F (1.3°C) and 22.1°F (-5.5°C). In Riley, the lowest average temperatures are observed in January, with a high of 34.3°F (1.3°C) and a low of 22.1°F (-5.5°C). Weather in January »
Weather in February
The last month of the winter, February, is also an icy month in Riley, Indiana, with temperature in the range of an average high of 39.6°F (4.2°C) and an average low of 25.5°F (-3.6°C). Riley, Indiana, ushers in February with an average high-temperature of a still cold 39.6°F (4.2°C), showing a close resemblance to the previous month. Weather in February »
Weather in March
The first month of the spring, March, is a fresh month in Riley, Indiana, with an average temperature varying between 51.4°F (10.8°C) and 36.1°F (2.3°C). Riley's transition into March is marked by a rise in the average high-temperature, advancing from an icy 39.6°F (4.2°C) in February to a fresh 51.4°F (10.8°C). Weather in March »
Weather in April
April in Riley, Indiana, is an enjoyable spring month, with temperature in the range of an average low of 46°F (7.8°C) and an average high of 62.4°F (16.9°C). April's arrival signals a temperature shift, moving from a fresh 51.4°F (10.8°C) in March to an enjoyable 62.4°F (16.9°C). Weather in April »
Weather in May
The last month of the spring, May, is an agreeable month in Riley, Indiana, with an average temperature varying between 55.8°F (13.2°C) and 72.5°F (22.5°C). In Riley, the average high-temperature in May rises, from an enjoyable 62.4°F (16.9°C) in April, to an agreeable 72.5°F (22.5°C). Weather in May »
Weather in June
June, the first month of the summer in Riley, is a moderately hot month, with temperature in the range of an average high of 80.6°F (27°C) and an average low of 63.9°F (17.7°C). June's arrival coincides with a marginal rise in the average high-temperature, moving from May's pleasant 72.5°F (22.5°C) to a moderately hot 80.6°F (27°C). Weather in June »
Weather in July
July, the same as June, is a moderately hot summer month in Riley, Indiana, with an average temperature fluctuating between 82.8°F (28.2°C) and 65.8°F (18.8°C). July is Riley's warmest month, registering average high temperatures of 82.8°F (28.2°C) and lows of 65.8°F (18.8°C). The average heat index in July is calculated to be a tropical 91.4°F (33°C). Weather in July »
Weather in August
August, the last month of the summer in Riley, is also a moderately hot month, with an average temperature ranging between min 64°F (17.8°C) and max 81.9°F (27.7°C). The advent of August denotes an average high-temperature of a still moderately hot 81.9°F (27.7°C), subtly different from July's 82.8°F (28.2°C). Weather in August »
Weather in September
The first month of the autumn, September, is still a warm month in Riley, Indiana, with an average temperature varying between 58.6°F (14.8°C) and 77°F (25°C). The transition from August to September sees an average high-temperature of a still moderately hot 77°F (25°C), indicating a minor variance from the prior month. Weather in September »
Weather in October
October, like September, in Riley, Indiana, is another enjoyable autumn month, with an average temperature varying between 47.5°F (8.6°C) and 64.2°F (17.9°C). October suggests a modest reduction in the average high-temperature, shifting from a moderately hot 77°F (25°C) in September to an enjoyable 64.2°F (17.9°C). Weather in October »
Weather in November
The last month of the autumn, November, is also a fresh month in Riley, Indiana, with temperature in the range of an average high of 50.2°F (10.1°C) and an average low of 36.3°F (2.4°C). The onset of November introduces a moderate change in Riley's weather, with average high-temperatures falling from October's comfortable 64.2°F (17.9°C) to a fresh 50.2°F (10.1°C). Weather in November »
Weather in December
December, the first month of the winter in Riley, is also an icy month, with an average temperature varying between 28.6°F (-1.9°C) and 39.6°F (4.2°C). As December commences, the average high-temperature shows a reduction, transitioning from a fresh 50.2°F (10.1°C) in November to an icy 39.6°F (4.2°C). Weather in December »
Updated: Aug 15, 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 are the coldest months?
In Riley, January records the average lowest temperatures, peaking at 34.3°F (1.3°C) and reaching a low of 22.1°F (-5.5°C).
How many days does it rain?
Throughout the year, there are 147.1 rainfall days, and 25.87" (657mm) of precipitation is accumulated.
When does it snow?
January through April, November and December are months with snowfall.
How many days does it snow?
In Riley, during the entire year, snow falls for 22.9 days and aggregates up to 7.4" (188mm) of snow.
What is the month with the least sunshine?
January has the least sunshine of the year, with an average of 4.3h of sunshine.
When is the lowest UV index?
The months with the lowest UV index are January, February, October through December, with an average maximum UV index of 2.
What is the driest month?
The month with the least rainfall is February, when the rain falls for 7.8 days and typically collects 1.42" (36mm) of precipitation.
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 EST to EDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from EDT to EST.
What is the wettest month?
The month with the most rainfall is April, when the rain falls for 14.4 days and typically aggregates up to 3.62" (92mm) of precipitation.
When it does not snow?
In Riley, snow does not fall in May through October.
When are the longest days?
The month with the longest days is June, with an average of 14h and 54min of daylight.
What month has the most sunshine?
June has the most sunshine of the year, with an average of 10.2h of sunshine.
When is the highest UV index?
The months with the highest UV index are June through August, with an average maximum UV index of 6.
What is the hottest time of year?
The warmest period is July, when temperatures fluctuate between an average high of 82.8°F (28.2°C) and a low of 65.8°F (18.8°C).
What is the most humid month?
The most humid month is July, with an average relative humidity of 83%.
What is the least humid month?
With an average relative humidity of 72%, October is the least humid month.
When does it snow the most in Riley?
December is the month with the most snowfall. Snow falls for 4.8 days and accumulates 1.85" (47mm) of snow.
What is the month with the shortest days in Riley?
December has the shortest days of the year, with an average of 9h and 24min of daylight.
Average temperature
Riley, IN
The warmest month (with the highest average high temperature) is July (82.8°F).
The month with the lowest average high temperature is January (34.3°F).
The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (22.1°F).
Average pressure
Riley, IN
- Average pressure in January:
30.15"Hg - Average pressure in February:
30.11"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.95"Hg - Average pressure in May:
29.97"Hg - Average pressure in June:
29.93"Hg
- Average pressure in July:
29.98"Hg - Average pressure in August:
29.99"Hg - Average pressure in September:
30.03"Hg - Average pressure in October:
30.03"Hg - Average pressure in November:
30.13"Hg - Average pressure in December:
30.13"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed
Riley, IN
- Average wind speed in January:
9.9mph - Average wind speed in February:
9.9mph - Average wind speed in March:
9.8mph - Average wind speed in April:
9.8mph - Average wind speed in May:
8mph - Average wind speed in June:
7mph
- Average wind speed in July:
5.9mph - Average wind speed in August:
5.9mph - Average wind speed in September:
6.6mph - Average wind speed in October:
8.5mph - Average wind speed in November:
9.1mph - Average wind speed in December:
9.1mph
The windiest months (with the highest average wind speed) are January and February (9.9mph).
The calmest months (with the lowest average wind speed) are July and August (5.9mph).
Average humidity
Riley, IN
The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (72%).
Average rainfall
Riley, IN
- Average rainfall in January:
1.81" - Average rainfall in February:
1.42" - Average rainfall in March:
2.01" - Average rainfall in April:
3.62" - Average rainfall in May:
3.03" - Average rainfall in June:
2.95"
- Average rainfall in July:
2.4" - Average rainfall in August:
2.01" - Average rainfall in September:
1.46" - Average rainfall in October:
1.73" - Average rainfall in November:
1.57" - Average rainfall in December:
1.85"
The wettest month (with the highest rainfall) is April (3.62").
The driest month (with the least rainfall) is February (1.42").
Average rainfall days
Riley, IN
- Average rainfall days in January:
7.9 days - Average rainfall days in February:
7.8 days - Average rainfall days in March:
13 days - Average rainfall days in April:
14.4 days - Average rainfall days in May:
19 days - Average rainfall days in June:
15.7 days
- Average rainfall days in July:
16.6 days - Average rainfall days in August:
12.6 days - Average rainfall days in September:
11.1 days - Average rainfall days in October:
10.9 days - Average rainfall days in November:
8.7 days - Average rainfall days in December:
9.4 days
The month with the highest number of rainy days is May (19 days).
The month with the least rainy days is February (7.8 days).
Average snowfall
Riley, IN
The month with the highest snowfall is December (1.85").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days
Riley, IN
- Average snowfall days in January:
6.9 days - Average snowfall days in February:
5.5 days - Average snowfall days in March:
3.3 days - Average snowfall days in April:
0.5 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 days - Average snowfall days in November:
1.9 days - Average snowfall days in December:
4.8 days
The month with the highest number of snowfall days is January (6.9 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Riley, IN
- Average daylight in January:
9h and 5min - 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 2min - Average daylight in June:
14h and 5min
- Average daylight in July:
14h and 4min - Average daylight in August:
13h and 4min - Average daylight in September:
12h and 2min - Average daylight in October:
11h and 1min - Average daylight in November:
10h and 0min - Average daylight in December:
9h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in January:
4h and 2min - Average sunshine in February:
5h and 3min - Average sunshine in March:
6h and 2min - Average sunshine in April:
7h and 0min - Average sunshine in May:
8h and 4min - Average sunshine in June:
10h and 1min
- Average sunshine in July:
9h and 5min - Average sunshine in August:
9h and 1min - Average sunshine in September:
8h and 3min - Average sunshine in October:
7h and 0min - Average sunshine in November:
5h and 2min - Average sunshine in December:
4h and 2min
The month with the most sunshine is June (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).
Average sunshine days
Riley, IN
- Average sunshine days in January:
17.2 days - Average sunshine days in February:
15.1 days - Average sunshine days in March:
15.2 days - Average sunshine days in April:
13.3 days - Average sunshine days in May:
9.3 days - Average sunshine days in June:
11.3 days
- Average sunshine days in July:
11.6 days - Average sunshine days in August:
15.5 days - Average sunshine days in September:
16.8 days - Average sunshine days in October:
18.2 days - Average sunshine days in November:
19 days - Average sunshine days in December:
17.7 days
The month with the most sunshine days is November (19 days).
The month with the least sunshine days is May (9.3 days).
Average UV index
Riley, IN
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, October, November and December (UV index 2).
Average cloud cover
Riley, IN
The month with the most cloud cover is January (Cloud cover 57).
The months with the least cloud cover are June, August and September (Cloud cover 31).
Average visibility
Riley, IN
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
Riley, Indiana, USA
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