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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 Royalton, Illinois, is an icy winter month, with an average temperature fluctuating between 26.2°F (-3.2°C) and 39.6°F (4.2°C). Royalton's temperature records reveal January as the coldest month, marked by average highs of 39.6°F (4.2°C) and lows of 26.2°F (-3.2°C). Weather in January »
Weather in February
February, the last month of the winter in Royalton, is a frosty month, with an average temperature fluctuating between 43.7°F (6.5°C) and 30°F (-1.1°C). The dawn of February sees an average high-temperature of a frosty 43.7°F (6.5°C), subtly contrasting with January's 39.6°F (4.2°C). Weather in February »
Weather in March
March, the first month of the spring in Royalton, is a fresh month, with an average temperature fluctuating between 55.2°F (12.9°C) and 38.8°F (3.8°C). Royalton's transition into March is marked by a temperature shift, moving from a chilly 43.7°F (6.5°C) in February to a fresh 55.2°F (12.9°C). Weather in March »
Weather in April
April is a comfortable spring month in Royalton, Illinois, with an average temperature varying between 48.6°F (9.2°C) and 66.2°F (19°C). Entering April, Royalton sees a temperature rise, with the average high-temperature advancing from March's cool 55.2°F (12.9°C) to a refreshing 66.2°F (19°C). Weather in April »
Weather in May
The last month of the spring, May, is a moderately hot month in Royalton, Illinois, with an average temperature varying between 58.3°F (14.6°C) and 75.7°F (24.3°C). The arrival of May brings a temperature shift, with the average high-temperature escalating from an enjoyable 66.2°F (19°C) in April to a warm 75.7°F (24.3°C). Weather in May »
Weather in June
June, the first month of the summer in Royalton, is still a warm month, with an average temperature ranging between max 84.7°F (29.3°C) and min 66.4°F (19.1°C). As May transitions into June, a change in temperatures is observed, with average highs moving from a warm 75.7°F (24.3°C) to a still moderately hot 84.7°F (29.3°C). Weather in June »
Weather in July
July in Royalton, Illinois, is a tropical summer month, with an average temperature ranging between max 87.4°F (30.8°C) and min 68.7°F (20.4°C). July is Royalton's warmest month, registering average high temperatures of 87.4°F (30.8°C) and lows of 68.7°F (20.4°C). In July, the average heat index is calculated to be a sweltering 102.2°F (39°C). Weather in July »
Weather in August
August, the last month of the summer in Royalton, is another warm month, with temperature in the range of an average low of 66.4°F (19.1°C) and an average high of 85.8°F (29.9°C). August ushers in an average high-temperature of a moderately hot 85.8°F (29.9°C), aligning closely with the preceding month. Weather in August »
Weather in September
September, the first month of the autumn in Royalton, is still a warm month, with an average temperature ranging between min 60.3°F (15.7°C) and max 80.4°F (26.9°C). The move into September indicates a slight reduction in the average high-temperature, down from August's 85.8°F (29.9°C) to a still warm 80.4°F (26.9°C). Weather in September »
Weather in October
October, like September, in Royalton, Illinois, is another comfortable autumn month, with an average temperature ranging between min 49.3°F (9.6°C) and max 67.5°F (19.7°C). Royalton's October weather comes with a decrease in average high-temperatures, moving from a moderately hot 80.4°F (26.9°C) in September to a comfortable 67.5°F (19.7°C). Weather in October »
Weather in November
November, the last month of the autumn in Royalton, is also a fresh month, with an average temperature varying between 38.7°F (3.7°C) and 54°F (12.2°C). A shift in Royalton's weather is observed as October turns into November, with the average high temperature reducing from a comfortable 67.5°F (19.7°C) to a cool 54°F (12.2°C). Weather in November »
Weather in December
December, the first month of the winter in Royalton, is also a frosty month, with temperature in the range of an average high of 43.7°F (6.5°C) and an average low of 31.8°F (-0.1°C). With December's arrival, Royalton, Illinois, sees a decrease in average high-temperatures, moving from a cool 54°F (12.2°C) in November to a chilly 43.7°F (6.5°C). Weather in December »
Updated: Feb 12, 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 part of the year is the coldest in Royalton?
Royalton's January weather, with an average high temperature of 39.6°F (4.2°C) and an average low temperature of 26.2°F (-3.2°C), tends to be the coldest of the year.
How many days does it rain in Royalton?
In Royalton, Illinois, during the entire year, the rain falls for 158.6 days and collects up to 34.69" (881mm) of precipitation.
When does it snow in Royalton?
Months with snowfall are January through April, October through December.
How much does it snow in Royalton?
In Royalton, during the entire year, snow falls for 15.9 days and aggregates up to 5.71" (145mm) of snow.
What is the month with the least sunshine in Royalton?
The month with the least sunshine in Royalton is January, with an average of 4.7h of sunshine.
What is the month with the lowest UV index in Royalton?
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Royalton, Illinois.
What is the snowiest month in Royalton?
February is the month with the most snowfall in Royalton, Illinois. Snow falls for 4.8 days and accumulates 1.73" (44mm) of snow.
When is Daylight Saving Time (DST) in Royalton?
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 in Royalton?
The month with the most rainfall is April, when the rain falls for 15.5 days and typically aggregates up to 4.49" (114mm) of precipitation.
What is the most humid month in Royalton?
The most humid month is May, with an average relative humidity of 79%.
When it does not snow in Royalton?
May through September are months without snowfall in Royalton, Illinois.
What are the months with the highest UV index in Royalton?
May through August, with an average maximum UV index of 6, are months with the highest UV index.
When are the longest days in Royalton?
June has the longest days of the year in Royalton, Illinois, with an average of 14h and 42min of daylight.
What month has the most sunshine in Royalton?
With an average of 10.6h of sunshine, June has the most sunshine of the year.
What month is the hottest in Royalton?
Royalton, Illinois, notes the warmest temperatures in July, with a average high of 87.4°F (30.8°C) and a low of 68.7°F (20.4°C).
What is the driest month in Royalton?
September is the month with the least rainfall. Rain falls for 12.7 days and accumulates 1.85" (47mm) of precipitation.
What is the least humid month in Royalton?
October is the least humid month in Royalton, with an average relative humidity of 71%.
What is the month with the shortest days in Royalton?
With an average of 9h and 36min of daylight, December has the shortest days of the year in Royalton, Illinois.
Average temperature
Royalton, IL
The warmest month (with the highest average high temperature) is July (87.4°F).
The month with the lowest average high temperature is January (39.6°F).
The month with the highest average low temperature is July (68.7°F).
The coldest month (with the lowest average low temperature) is January (26.2°F).
Average pressure
Royalton, IL
- Average pressure in January:
30.16"Hg - Average pressure in February:
30.12"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:
29.98"Hg - Average pressure in September:
30.02"Hg - Average pressure in October:
30.04"Hg - Average pressure in November:
30.14"Hg - Average pressure in December:
30.14"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed
Royalton, IL
- Average wind speed in January:
9.4mph - Average wind speed in February:
9.3mph - Average wind speed in March:
9.1mph - Average wind speed in April:
8.9mph - Average wind speed in May:
7.5mph - Average wind speed in June:
6.5mph
- Average wind speed in July:
5.7mph - Average wind speed in August:
5.6mph - Average wind speed in September:
6.2mph - Average wind speed in October:
7.8mph - Average wind speed in November:
8.5mph - Average wind speed in December:
8.6mph
The windiest month (with the highest average wind speed) is January (9.4mph).
The calmest month (with the lowest average wind speed) is August (5.6mph).
Average humidity
Royalton, IL
The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is October (71%).
Average rainfall
Royalton, IL
- Average rainfall in January:
2.17" - Average rainfall in February:
2.36" - Average rainfall in March:
3.11" - Average rainfall in April:
4.49" - Average rainfall in May:
3.82" - Average rainfall in June:
3.43"
The wettest month (with the highest rainfall) is April (4.49").
The driest month (with the least rainfall) is September (1.85").
Average rainfall days
Royalton, IL
- Average rainfall days in January:
9.4 days - Average rainfall days in February:
10.3 days - Average rainfall days in March:
15.2 days - Average rainfall days in April:
15.5 days - Average rainfall days in May:
17.1 days - Average rainfall days in June:
16 days
- Average rainfall days in July:
16.8 days - Average rainfall days in August:
13.9 days - Average rainfall days in September:
12.7 days - Average rainfall days in October:
10.8 days - Average rainfall days in November:
10.6 days - Average rainfall days in December:
10.3 days
The month with the highest number of rainy days is May (17.1 days).
The month with the least rainy days is January (9.4 days).
Average snowfall
Royalton, IL
The month with the highest snowfall is February (1.73").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Royalton, IL
- Average snowfall days in January:
4.8 days - Average snowfall days in February:
4.8 days - Average snowfall days in March:
1.8 days - Average snowfall days in April:
0.4 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:
0.1 days - Average snowfall days in November:
1 days - Average snowfall days in December:
3 days
The months with the highest number of snowfall days are January and February (4.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Royalton, IL
- Average daylight in January:
9h and 5min - Average daylight in February:
10h and 5min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 1min - Average daylight in May:
14h and 1min - Average daylight in June:
14h and 4min
- Average daylight in July:
14h and 3min - 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 1min - Average daylight in December:
9h and 4min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in January:
4h and 4min - Average sunshine in February:
4h and 5min - Average sunshine in March:
6h and 3min - Average sunshine in April:
8h and 4min - Average sunshine in May:
9h and 2min - Average sunshine in June:
10h and 4min
- Average sunshine in July:
10h and 3min - Average sunshine in August:
10h and 2min - Average sunshine in September:
9h and 3min - Average sunshine in October:
6h and 3min - Average sunshine in November:
5h and 4min - Average sunshine in December:
4h and 5min
The month with the most sunshine is June (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).
Average sunshine days
Royalton, IL
- Average sunshine days in January:
17.7 days - Average sunshine days in February:
13.6 days - Average sunshine days in March:
13.4 days - Average sunshine days in April:
12.3 days - Average sunshine days in May:
11.3 days - Average sunshine days in June:
12.2 days
- Average sunshine days in July:
11.7 days - Average sunshine days in August:
14.2 days - Average sunshine days in September:
16 days - Average sunshine days in October:
18.5 days - Average sunshine days in November:
17.9 days - Average sunshine days in December:
18.4 days
The month with the most sunshine days is October (18.5 days).
The month with the least sunshine days is May (11.3 days).
Average UV index
Royalton, IL
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover
Royalton, IL
The month with the most cloud cover is February (Cloud cover 50).
The months with the least cloud cover are June and August (Cloud cover 27).
Average visibility
Royalton, 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).
Royalton, Illinois, USA
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