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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 an average temperature ranging between max 31.5°F (-0.3°C) and min 19.8°F (-6.8°C). With average high temperatures of 31.5°F (-0.3°C) and lows of 19.8°F (-6.8°C), January is the 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 fluctuating between 23.7°F (-4.6°C) and 36.1°F (2.3°C). As Royal, Illinois, welcomes February, the average high-temperature stabilizes at a cold 36.1°F (2.3°C), showing little deviation from January's 31.5°F (-0.3°C). Weather in February »
Weather in March
March, the first month of the spring in Royal, is a frosty month, with an average temperature varying between 34.3°F (1.3°C) and 49.1°F (9.5°C). March signals a shift in the average high-temperature, moving from February's icy 36.1°F (2.3°C) to a chilly 49.1°F (9.5°C). Weather in March »
Weather in April
April in Royal, Illinois, is an enjoyable spring month, with an average temperature varying between 45.3°F (7.4°C) and 60.8°F (16°C). April's arrival brings a temperature shift, moving from a frosty 49.1°F (9.5°C) in March to a refreshing 60.8°F (16°C). Weather in April »
Weather in May
May, the last month of the spring in Royal, is a pleasant month, with an average temperature fluctuating between 72.1°F (22.3°C) and 55.6°F (13.1°C). The arrival of May brings a change in Royal's weather, with average high-temperatures moving from April's enjoyable 60.8°F (16°C) to an agreeable 72.1°F (22.3°C). Weather in May »
Weather in June
The first month of the summer, June, is a moderately hot month in Royal, Illinois, with an average temperature ranging between min 63.7°F (17.6°C) and max 79.9°F (26.6°C). June showcases a minor temperature ascent, adjusting from May's pleasant 72.1°F (22.3°C) to a moderately hot 79.9°F (26.6°C). Weather in June »
Weather in July
July, like June, in Royal, Illinois, is another warm summer month, with temperature in the range of an average high of 81°F (27.2°C) and an average low of 64.8°F (18.2°C). During the warmest month, July, temperatures average a high of 81°F (27.2°C) and a low of 64.8°F (18.2°C). The heat index value for July is evaluated at 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 temperature in the range of an average high of 80.2°F (26.8°C) and an average low of 63.1°F (17.3°C). August records an average high-temperature of a still moderately hot 80.2°F (26.8°C), indicating a minor variation from the preceding month. Weather in August »
Weather in September
The first month of the autumn, September, is also a moderately hot month in Royal, Illinois, with an average temperature ranging between min 57.9°F (14.4°C) and max 76.1°F (24.5°C). The arrival of September records an average high-temperature of a still warm 76.1°F (24.5°C), closely related to the 80.2°F (26.8°C) observed in August. Weather in September »
Weather in October
October, like September, in Royal, Illinois, is another enjoyable autumn month, with an average temperature fluctuating between 63.1°F (17.3°C) and 47.1°F (8.4°C). The start of October comes with a reduction in the average high-temperature, receding from a moderately hot 76.1°F (24.5°C) in September to a refreshing 63.1°F (17.3°C). Weather in October »
Weather in November
The last month of the autumn, November, is another chilly month in Royal, Illinois, with an average temperature varying between 48.7°F (9.3°C) and 35.6°F (2°C). November's onset brings a clear reduction in the average high-temperature, falling from a refreshing 63.1°F (17.3°C) in October to a frosty 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). Royal's weather in December involves a decrease in the average high-temperature, moving down from November's chilly 48.7°F (9.3°C) to an icy 37.6°F (3.1°C). Weather in December »
[Resources]Frequently asked questions
What are the coldest months in Royal?
Royal's coldest month, January, registers temperatures that range from a high of 31.5°F (-0.3°C) to a low of 19.8°F (-6.8°C).
How much does it rain in Royal?
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 in Royal?
Months with snowfall are January through April, November and December.
How many days does it snow in Royal?
In Royal, Illinois, during the entire year, snow falls for 26.9 days and aggregates up to 3.78" (96mm) of snow.
What is the month with the least sunshine in Royal?
January has the least sunshine of the year in Royal, with an average of 4h of sunshine.
What is the month with the lowest UV index in Royal?
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.
What is the driest month in Royal?
The month with the least rainfall in Royal, Illinois, is February, when the rain falls for 4.6 days and typically collects 0.67" (17mm) of precipitation.
What is the snowiest month in Royal?
February is the month with the most snowfall in Royal, Illinois. Snow falls for 7.3 days and accumulates 1.38" (35mm) of snow.
When is Daylight Saving Time (DST) in Royal?
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 in Royal?
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 in Royal?
In Royal, snow does not fall in May through October.
When are the longest days in Royal?
The month with the longest days in Royal, Illinois, is June, with an average of 15h and 0min of daylight.
What month has the most sunshine in Royal?
The month with the most sunshine is June, with an average of 10.1h of sunshine.
What are the months 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 in Royal.
What is the warmest month in Royal?
July is the month that records the highest temperatures, with averages ranging from a high of 81°F (27.2°C) to a low of 64.8°F (18.2°C).
What is the most humid month in Royal?
The most humid month is July, with an average relative humidity of 85%.
What is the least humid month in Royal?
With an average relative humidity of 71%, October is the least humid month in Royal.
What is the month with the shortest days in Royal?
December has the shortest days of the year, with an average of 9h and 24min of daylight.
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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