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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, is another subzero cold winter month in Castleton, Illinois, with an average temperature fluctuating between 17.8°F (-7.9°C) and 29.7°F (-1.3°C). Castleton, Illinois, records the coldest temperatures in January, averaging a high of 29.7°F (-1.3°C) and a low of 17.8°F (-7.9°C). Weather in January »
Weather in February
February, the last month of the winter in Castleton, is a cold month, with an average temperature varying between 21.6°F (-5.8°C) and 34.5°F (1.4°C). In February, Castleton's weather conditions record an average high-temperature of an icy 34.5°F (1.4°C), demonstrating little divergence from the preceding month. Weather in February »
Weather in March
The first month of the spring, March, is a chilly month in Castleton, Illinois, with an average temperature fluctuating between 48.2°F (9°C) and 33.3°F (0.7°C). The start of March brings a shift in the average high-temperature, increasing from February's wintry 34.5°F (1.4°C) to a frosty 48.2°F (9°C). Weather in March »
Weather in April
April in Castleton, Illinois, is a refreshing spring month, with an average temperature ranging between min 43.3°F (6.3°C) and max 59.7°F (15.4°C). Castleton sees a rise in temperature during April, with average high-temperatures transitioning from a frosty 48.2°F (9°C) in March to a moderate 59.7°F (15.4°C). Weather in April »
Weather in May
The last month of the spring, May, is an agreeable month in Castleton, Illinois, with an average temperature varying between 71.1°F (21.7°C) and 54.1°F (12.3°C). The onset of May brings a temperature shift, with the average high-temperature moving from a refreshing 59.7°F (15.4°C) in April to an agreeable 71.1°F (21.7°C). Weather in May »
Weather in June
The first month of the summer, June, is a moderately hot month in Castleton, Illinois, with an average temperature fluctuating between 62.2°F (16.8°C) and 79.3°F (26.3°C). The beginning of June signals a minor rise in the average high-temperature, moving from an agreeable 71.1°F (21.7°C) in May to a moderately hot 79.3°F (26.3°C). Weather in June »
Weather in July
July, like June, in Castleton, Illinois, is another warm summer month, with an average temperature ranging between max 81.1°F (27.3°C) and min 64.8°F (18.2°C). In Castleton, the peak average temperatures are observed in July, with a high of 81.1°F (27.3°C) and a low of 64.8°F (18.2°C). The average heat index in July is calculated to be a hot 87.8°F (31°C). Weather in July »
Weather in August
August, the last month of the summer in Castleton, is another warm month, with an average temperature varying between 63.1°F (17.3°C) and 80.2°F (26.8°C). August welcomes an average high-temperature of a still moderately hot 80.2°F (26.8°C), not much different from the preceding month. Weather in August »
Weather in September
The first month of the autumn, September, is also a moderately hot month in Castleton, Illinois, with an average temperature varying between 75.7°F (24.3°C) and 56.7°F (13.7°C). September records an average high-temperature of a still warm 75.7°F (24.3°C), indicating a minor variation from the preceding month. Weather in September »
Weather in October
October, like September, in Castleton, Illinois, is another refreshing autumn month, with an average temperature fluctuating between 61.7°F (16.5°C) and 45.9°F (7.7°C). Arrival of October comes with a reduction in the average high-temperature, falling from a warm 75.7°F (24.3°C) in September to a comfortable 61.7°F (16.5°C). Weather in October »
Weather in November
The last month of the autumn, November, is another chilly month in Castleton, Illinois, with an average temperature ranging between max 47.5°F (8.6°C) and min 33.8°F (1°C). As October transitions into November, Castleton sees a drop in the average high-temperature, transitioning from a refreshing 61.7°F (16.5°C) to a chilly 47.5°F (8.6°C). Weather in November »
Weather in December
The first month of the winter, December, is still a cold month in Castleton, Illinois, with an average temperature ranging between min 25°F (-3.9°C) and max 35.8°F (2.1°C). Arrival of December comes with a reduction in the average high-temperature, falling from a chilly 47.5°F (8.6°C) in November to an icy 35.8°F (2.1°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 month is the coldest in Castleton?
Castleton's coldest month, January, registers temperatures that range from a high of 29.7°F (-1.3°C) to a low of 17.8°F (-7.9°C).
What is the driest month in Castleton?
January is the month with the least rainfall in Castleton, Illinois. Rain falls for 4.2 days and accumulates 0.59" (15mm) of precipitation.
How many days does it rain in Castleton?
Throughout the year, there are 116.8 rainfall days, and 13.98" (355mm) of precipitation is accumulated.
When does it snow in Castleton?
Months with snowfall in Castleton are January through April, October through December.
What is the snowiest month in Castleton?
The month with the most snowfall in Castleton, Illinois, is January, when snow falls for 8.6 days and typically aggregates up to 1.81" (46mm) of snow.
How many days does it snow in Castleton?
Throughout the year, in Castleton, there are 26.8 snowfall days, and 6.26" (159mm) of snow is accumulated.
What is the month with the least sunshine in Castleton?
January has the least sunshine of the year in Castleton, Illinois, with an average of 3.9h of sunshine.
What is the month with the lowest UV index in Castleton?
January and December, with an average maximum UV index of 1, are months with the lowest UV index in Castleton, Illinois.
When is Daylight Saving Time (DST) in Castleton?
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 Castleton?
The month with the most rainfall in Castleton is May, when the rain falls for 15.2 days and typically aggregates up to 2.24" (57mm) of precipitation.
When it does not snow in Castleton?
In Castleton, snow does not fall in May through September.
When are the longest days in Castleton?
With an average of 15h and 6min of daylight, June has the longest days of the year.
What are the months with the most sunshine in Castleton?
June and July, with an average of 10h of sunshine, are months with the most sunshine in Castleton, Illinois.
When is the highest UV index in Castleton?
The months with the highest UV index are June and July, with an average maximum UV index of 6.
What time of the year is the hottest in Castleton?
Castleton's warmest month, July, generally records average temperatures ranging from a high of 81.1°F (27.3°C) to a low of 64.8°F (18.2°C).
What is the most humid month in Castleton?
The most humid month in Castleton, Illinois, is July, with an average relative humidity of 84%.
What is the least humid month in Castleton?
The least humid month in Castleton, Illinois, is October, with an average relative humidity of 72%.
What is the month with the shortest days in Castleton?
The month with the shortest days is December, with an average of 9h and 18min of daylight.
Average temperature
Castleton, IL
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (29.7°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 (17.8°F).
Average pressure
Castleton, 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:
29.95"Hg - Average pressure in June:
29.91"Hg
- Average pressure in July:
29.97"Hg - Average pressure in August:
29.97"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:
30.11"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed
Castleton, IL
- Average wind speed in January:
10.5mph - Average wind speed in February:
10.4mph - Average wind speed in March:
10.4mph - Average wind speed in April:
10.7mph - Average wind speed in May:
9mph - Average wind speed in June:
7.9mph
- Average wind speed in July:
6.7mph - Average wind speed in August:
6.6mph - Average wind speed in September:
7.8mph - Average wind speed in October:
9.4mph - Average wind speed in November:
10.1mph - Average wind speed in December:
9.9mph
The windiest month (with the highest average wind speed) is April (10.7mph).
The calmest month (with the lowest average wind speed) is August (6.6mph).
Average humidity
Castleton, IL
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (72%).
Average rainfall
Castleton, IL
- Average rainfall in January:
0.59" - Average rainfall in February:
0.67" - Average rainfall in March:
1.02" - Average rainfall in April:
1.65" - Average rainfall in May:
2.24" - Average rainfall in June:
1.73"
- Average rainfall in July:
1.34" - Average rainfall in August:
1.02" - Average rainfall in September:
1.1" - Average rainfall in October:
1.22" - Average rainfall in November:
0.75" - Average rainfall in December:
0.63"
The wettest month (with the highest rainfall) is May (2.24").
The driest month (with the least rainfall) is January (0.59").
Average rainfall days
Castleton, IL
- Average rainfall days in January:
4.2 days - Average rainfall days in February:
4.2 days - Average rainfall days in March:
10.1 days - Average rainfall days in April:
13.6 days - Average rainfall days in May:
15.2 days - Average rainfall days in June:
14.2 days
- Average rainfall days in July:
14.2 days - Average rainfall days in August:
10.5 days - Average rainfall days in September:
9.3 days - Average rainfall days in October:
9.4 days - Average rainfall days in November:
6.5 days - Average rainfall days in December:
5.4 days
The month with the highest number of rainy days is May (15.2 days).
The months with the least rainy days are January and February (4.2 days).
Average snowfall
Castleton, IL
The month with the highest snowfall is January (1.81").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Castleton, IL
- Average snowfall days in January:
8.6 days - Average snowfall days in February:
6.8 days - Average snowfall days in March:
3.1 days - Average snowfall days in April:
0.7 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:
1.5 days - Average snowfall days in December:
5.8 days
The month with the highest number of snowfall days is January (8.6 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Castleton, 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 3min - Average daylight in June:
15h and 1min
- Average daylight in July:
14h and 5min - Average daylight in August:
13h and 5min - Average daylight in September:
12h and 3min - Average daylight in October:
11h and 1min - Average daylight in November:
9h and 5min - Average daylight in December:
9h and 2min
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 18min).
- Average sunshine in January:
3h and 5min - Average sunshine in February:
4h and 1min - Average sunshine in March:
6h and 3min - Average sunshine in April:
7h and 5min - Average sunshine in May:
8h and 5min - Average sunshine in June:
10h and 0min
- Average sunshine in July:
10h and 0min - Average sunshine in August:
9h and 5min - Average sunshine in September:
9h and 1min - Average sunshine in October:
5h and 4min - Average sunshine in November:
5h and 2min - Average sunshine in December:
4h and 2min
The months with the most sunshine are June and July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days
Castleton, IL
- Average sunshine days in January:
19.8 days - Average sunshine days in February:
18.8 days - Average sunshine days in March:
17.9 days - Average sunshine days in April:
15.2 days - Average sunshine days in May:
12.8 days - Average sunshine days in June:
13.2 days
- Average sunshine days in July:
13.5 days - Average sunshine days in August:
17.6 days - Average sunshine days in September:
18.3 days - Average sunshine days in October:
19.7 days - Average sunshine days in November:
21.3 days - Average sunshine days in December:
20.4 days
The month with the most sunshine days is November (21.3 days).
The month with the least sunshine days is May (12.8 days).
Average UV index
Castleton, IL
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover
Castleton, IL
The month with the most cloud cover is January (Cloud cover 58).
The month with the least cloud cover is September (Cloud cover 30).
Average visibility
Castleton, 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).
Castleton, Illinois, USA
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