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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 Royal, Illinois, is another subzero cold winter month, with temperature in the range of an average high of 31.5°F (-0.3°C) and an average low of 19.8°F (-6.8°C). January, recording an average high temperature of 31.5°F (-0.3°C) and a low temperature of 19.8°F (-6.8°C), is Royal's coldest month. Weather in January »
Weather in February
The last month of the winter, February, is a wintry month in Royal, Illinois, with an average temperature varying between 23.7°F (-4.6°C) and 36.1°F (2.3°C). February's advent presents an average high-temperature of a wintry 36.1°F (2.3°C), indicating a slight variation from the conditions of the previous month. Weather in February »
Weather in March
March, the first month of the spring in Royal, is a frosty month, with an average temperature ranging between max 49.1°F (9.5°C) and min 34.3°F (1.3°C). With the onset of March, Royal experiences a temperature shift, with the average high-temperature moving from a cold 36.1°F (2.3°C) in February to a frosty 49.1°F (9.5°C). Weather in March »
Weather in April
April in Royal, Illinois, is a refreshing spring month, with temperature in the range of an average low of 45.3°F (7.4°C) and an average high of 60.8°F (16°C). The shift from March to April sees an increase in the average high-temperature, transitioning from a chilly 49.1°F (9.5°C) to a comfortable 60.8°F (16°C). Weather in April »
Weather in May
May, the last month of the spring in Royal, is an agreeable month, with temperature in the range of an average low of 55.6°F (13.1°C) and an average high of 72.1°F (22.3°C). The onset of May brings a temperature shift, with the average high-temperature moving from a comfortable 60.8°F (16°C) in April to an agreeable 72.1°F (22.3°C). Weather in May »
Weather in June
June, the first month of the summer in Royal, is a warm month, with an average temperature varying between 63.7°F (17.6°C) and 79.9°F (26.6°C). Royal in June denotes a subtle temperature transition, adjusting from an average high of an agreeable 72.1°F (22.3°C) in May to a moderately hot 79.9°F (26.6°C). Weather in June »
Weather in July
July, like June, in Royal, Illinois, is a moderately hot summer month, with temperature in the range of an average low of 64.8°F (18.2°C) and an average high of 81°F (27.2°C). July is Royal's warmest month, registering average high temperatures of 81°F (27.2°C) and lows of 64.8°F (18.2°C). July's heat index is computed to be a tropical 87.8°F (31°C). Weather in July »
Weather in August
The last month of the summer, August, is another warm month in Royal, Illinois, with an average temperature ranging between max 80.2°F (26.8°C) and min 63.1°F (17.3°C). As Royal steps into August, the average high-temperature holds at a still moderately hot 80.2°F (26.8°C), hinting at a minor fluctuation from the prior month. Weather in August »
Weather in September
September, the first month of the autumn in Royal, is also a moderately hot month, with an average temperature ranging between max 76.1°F (24.5°C) and min 57.9°F (14.4°C). As August transitions into September, the average high-temperature rests at a still warm 76.1°F (24.5°C), maintaining a close resemblance to the previous month. Weather in September »
Weather in October
October, the same as September, is another refreshing autumn month in Royal, Illinois, with an average temperature fluctuating between 47.1°F (8.4°C) and 63.1°F (17.3°C). Setting in of October comes with a decrease in the average high-temperature, moving from a warm 76.1°F (24.5°C) in September to an enjoyable 63.1°F (17.3°C). Weather in October »
Weather in November
November, the last month of the autumn in Royal, is another chilly month, with an average temperature varying between 48.7°F (9.3°C) and 35.6°F (2°C). As Royal steps into November, a marked temperature drop is observed, with the average high-temperature reducing from October's refreshing 63.1°F (17.3°C) to a chilly 48.7°F (9.3°C). Weather in November »
Weather in December
December, the first month of the winter in Royal, is also an icy month, with an average temperature ranging between max 37.6°F (3.1°C) and min 27.5°F (-2.5°C). In December, the average high-temperature decreases from a chilly 48.7°F (9.3°C) in November to a wintry 37.6°F (3.1°C). Weather in December »
Updated: Jul 23, 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 is the coldest time of year?
January, with an average high of 31.5°F (-0.3°C) and a low of 19.8°F (-6.8°C), signifies the coldest month of the year in Royal.
How much does it rain?
In Royal, Illinois, during the entire year, the rain falls for 121.5 days and collects up to 13.46" (342mm) of precipitation.
When does it snow?
January through April, November and December are months with snowfall.
How many days does it snow?
Throughout the year, there are 26.9 snowfall days, and 3.78" (96mm) of snow is accumulated.
What is the month with the least sunshine in Royal?
The month with the least sunshine is January, with an average of 4h of sunshine.
What are the months with the lowest UV index?
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Royal.
What is the driest month?
February is the month with the least rainfall. Rain falls for 4.6 days and accumulates 0.67" (17mm) of precipitation.
When does it snow the most?
February is the month with the most snowfall. Snow falls for 7.3 days and accumulates 1.38" (35mm) 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 wettest month?
May is the month with the most rainfall. Rain falls for 14.8 days and accumulates 1.77" (45mm) of precipitation.
When it does not snow?
May through October are months without snowfall.
When are the longest days?
June has the longest days of the year, with an average of 15h and 0min of daylight.
What month has the most sunshine?
With an average of 10.1h of sunshine, June has the most sunshine of the year.
What is the month with the highest UV index in Royal?
June through August, with an average maximum UV index of 6, are months with the highest UV index.
What is the warmest month?
July, recording an average high temperature of 81°F (27.2°C) and a low temperature of 64.8°F (18.2°C), is Royal's warmest month.
What is the most humid month?
The most humid month in Royal is July, with an average relative humidity of 85%.
What is the least humid month?
With an average relative humidity of 71%, October is the least humid month.
What is the month with the shortest days?
With an average of 9h and 24min of daylight, December has the shortest days of the year in Royal.
Average temperature
Royal, IL
The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (31.5°F).
The month with the highest average low temperature is July (64.8°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).
Average pressure
Royal, IL
- Average pressure in January:
30.14"Hg - Average pressure in February:
30.11"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.94"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:
30.02"Hg - Average pressure in November:
30.12"Hg - Average pressure in December:
30.12"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed
Royal, IL
- Average wind speed in January:
10.7mph - Average wind speed in February:
10.6mph - Average wind speed in March:
10.3mph - Average wind speed in April:
10.5mph - Average wind speed in May:
8.9mph - Average wind speed in June:
7.7mph
- Average wind speed in July:
6.5mph - Average wind speed in August:
6.4mph - Average wind speed in September:
7.4mph - Average wind speed in October:
9.4mph - Average wind speed in November:
10.1mph - Average wind speed in December:
10.1mph
The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest month (with the lowest average wind speed) is August (6.4mph).
Average humidity
Royal, IL
The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (71%).
Average rainfall
Royal, IL
- Average rainfall in January:
0.87" - Average rainfall in February:
0.67" - Average rainfall in March:
1.22" - Average rainfall in April:
1.57" - Average rainfall in May:
1.77" - Average rainfall in June:
1.57"
- Average rainfall in July:
1.38" - Average rainfall in August:
1.14" - Average rainfall in September:
0.75" - Average rainfall in October:
1.06" - Average rainfall in November:
0.75" - Average rainfall in December:
0.71"
The wettest month (with the highest rainfall) is May (1.77").
The driest month (with the least rainfall) is February (0.67").
Average rainfall days
Royal, IL
- Average rainfall days in January:
5.7 days - Average rainfall days in February:
4.6 days - Average rainfall days in March:
10.3 days - Average rainfall days in April:
12.8 days - Average rainfall days in May:
14.8 days - Average rainfall days in June:
14.2 days
- Average rainfall days in July:
13.9 days - Average rainfall days in August:
11.7 days - Average rainfall days in September:
9.9 days - Average rainfall days in October:
9.6 days - Average rainfall days in November:
7.1 days - Average rainfall days in December:
6.9 days
The month with the highest number of rainy days is May (14.8 days).
The month with the least rainy days is February (4.6 days).
Average snowfall
Royal, IL
The month with the highest snowfall is February (1.38").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days
Royal, IL
- Average snowfall days in January:
7.9 days - Average snowfall days in February:
7.3 days - Average snowfall days in March:
2.9 days - Average snowfall days in April:
0.8 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:
0.2 days - Average snowfall days in November:
1.7 days - Average snowfall days in December:
6.1 days
The month with the highest number of snowfall days is January (7.9 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Royal, 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 2min - Average daylight in June:
15h and 0min
- 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: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in January:
4h and 0min - Average sunshine in February:
4h and 1min - Average sunshine in March:
6h and 2min - Average sunshine in April:
8h and 0min - Average sunshine in May:
9h and 0min - Average sunshine in June:
10h and 1min
- Average sunshine in July:
9h and 5min - Average sunshine in August:
9h and 5min - Average sunshine in September:
8h and 5min - Average sunshine in October:
6h and 1min - Average sunshine in November:
5h and 2min - Average sunshine in December:
4h and 3min
The month with the most sunshine is June (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days
Royal, IL
- Average sunshine days in January:
19.8 days - Average sunshine days in February:
16.5 days - Average sunshine days in March:
16.8 days - Average sunshine days in April:
14.7 days - Average sunshine days in May:
13.2 days - Average sunshine days in June:
11.8 days
- Average sunshine days in July:
11.3 days - Average sunshine days in August:
14.8 days - Average sunshine days in September:
17.4 days - Average sunshine days in October:
18.8 days - Average sunshine days in November:
20.4 days - Average sunshine days in December:
19.4 days
The month with the most sunshine days is November (20.4 days).
The month with the least sunshine days is July (11.3 days).
Average UV index
Royal, 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, February, November and December (UV index 2).
Average cloud cover
Royal, IL
The month with the most cloud cover is January (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility
Royal, IL
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).
Royal, Illinois, USA
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