Climate and monthly weather forecastCasey, IL
Climate and monthly weather forecast
Weather in January
January, like December, in Casey, Illinois, is an icy winter month, with an average temperature ranging between min 22.6°F (-5.2°C) and max 34.7°F (1.5°C). Casey's coldest weather arrives in January, when temperatures average a high of 34.7°F (1.5°C) and a low of 22.6°F (-5.2°C). Weather in January »Weather in February
The last month of the winter, February, is also a wintry month in Casey, Illinois, with temperature in the range of an average high of 39.7°F (4.3°C) and an average low of 26.4°F (-3.1°C). The advent of February brings an average high-temperature of a still icy 39.7°F (4.3°C), almost identical to the preceding month. Weather in February »Weather in March
The first month of the spring, March, is a cool month in Casey, Illinois, with temperature in the range of an average high of 51.4°F (10.8°C) and an average low of 36.5°F (2.5°C). A shift in the average high-temperature is noticeable in March, changing from an icy 39.7°F (4.3°C) in February to a cool 51.4°F (10.8°C). Weather in March »Weather in April
April is an enjoyable spring month in Casey, Illinois, with an average temperature fluctuating between 62.8°F (17.1°C) and 46.4°F (8°C). With the onset of April, Casey's weather sees a temperature rise, transitioning from a cool 51.4°F (10.8°C) in March to an enjoyable 62.8°F (17.1°C). Weather in April »Weather in May
May, the last month of the spring in Casey, is an agreeable month, with an average temperature varying between 56.7°F (13.7°C) and 73°F (22.8°C). The arrival of May brings a temperature shift, with the average high-temperature escalating from a comfortable 62.8°F (17.1°C) in April to an agreeable 73°F (22.8°C). Weather in May »Weather in June
June, the first month of the summer in Casey, is a warm month, with an average temperature ranging between min 64.9°F (18.3°C) and max 81.1°F (27.3°C). A minor escalation in the average high-temperature is seen with the onset of June, moving from a pleasant 73°F (22.8°C) in May to a moderately hot 81.1°F (27.3°C). Weather in June »Weather in July
July, the same as June, is a moderately hot summer month in Casey, Illinois, with an average temperature varying between 66.4°F (19.1°C) and 82.9°F (28.3°C). The warmest temperatures occur during July, when averages reach a peak of 82.9°F (28.3°C) and a low of 66.4°F (19.1°C). Throughout July, the heat index is computed to be a tropical 91.4°F (33°C). Weather in July »Weather in August
August, the last month of the summer in Casey, is another warm month, with temperature in the range of an average low of 64°F (17.8°C) and an average high of 81.7°F (27.6°C). The arrival of August marks a slight shift to an average high-temperature of a still warm 81.7°F (27.6°C) from July's 82.9°F (28.3°C). Weather in August »Weather in September
September, the first month of the autumn in Casey, is still a warm month, with temperature in the range of an average high of 77.4°F (25.2°C) and an average low of 59.2°F (15.1°C). Upon the beginning of September, Casey's high-temperatures register at a still moderately hot 77.4°F (25.2°C), closely mirroring the preceding month. Weather in September »Weather in October
October, the same as September, is another enjoyable autumn month in Casey, Illinois, with an average temperature fluctuating between 64.2°F (17.9°C) and 48.4°F (9.1°C). With October's onset, the weather shows a temperature decrease, transitioning from a warm 77.4°F (25.2°C) in September to a refreshing 64.2°F (17.9°C). Weather in October »Weather in November
November, the last month of the autumn in Casey, is also a fresh month, with an average temperature ranging between max 50.5°F (10.3°C) and min 36.5°F (2.5°C). A shift in the average high-temperature occurs in November, reducing from an enjoyable 64.2°F (17.9°C) in October to a cool 50.5°F (10.3°C). Weather in November »Weather in December
The first month of the winter, December, is also a wintry month in Casey, Illinois, with temperature in the range of an average low of 28.9°F (-1.7°C) and an average high of 39.7°F (4.3°C). A decrease in the average high-temperature is observed during December, shifting from a fresh 50.5°F (10.3°C) in November to a wintry 39.7°F (4.3°C). Weather in December »Updated: Jul 6, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
January is Casey's coldest month, registering average high temperatures of 34.7°F (1.5°C) and lows of 22.6°F (-5.2°C).
In Casey, during the entire year, the rain falls for 115.9 days and collects up to 11.26" (286mm) of precipitation.
January through April, November and December are months with snowfall.
In Casey, during the entire year, snow falls for 18.9 days and aggregates up to 1.73" (44mm) of snow.
With an average of 4.1h of sunshine, January has the least sunshine of the year.
February is the month with the least rainfall. Rain falls for 6 days and accumulates 0.47" (12mm) of precipitation.
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.
The month with the most rainfall is April, when the rain falls for 12.6 days and typically aggregates up to 1.54" (39mm) of precipitation.
In Casey, snow does not fall in May through October.
With an average of 14h and 54min of daylight, June has the longest days of the year.
The month with the most sunshine is June, with an average of 10.4h of sunshine.
June through August, with an average maximum UV index of 6, are months with the highest UV index.
In Casey, July records the average highest temperatures, peaking at 82.9°F (28.3°C) and reaching a low of 66.4°F (19.1°C).
The most humid month is July, with an average relative humidity of 83%.
With an average relative humidity of 71%, October is the least humid month.
The month with the most snowfall is December, when snow falls for 4 days and typically aggregates up to 0.47" (12mm) of snow.
The month with the shortest days is December, with an average of 9h and 30min of daylight.
December is the month with the lowest UV index, with an average maximum UV index of 1.
Average temperature
Casey, IL
The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is January (34.7°F).
The month with the highest average low temperature is July (66.4°F).
The coldest month (with the lowest average low temperature) is January (22.6°F).
Average pressure
Casey, IL
- 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:
29.96"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:
30.03"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
Casey, IL
- Average wind speed in January:
10.4mph - Average wind speed in February:
10.4mph - Average wind speed in March:
10.1mph - Average wind speed in April:
10.1mph - Average wind speed in May:
8.4mph - Average wind speed in June:
7.3mph
- Average wind speed in July:
6.1mph - Average wind speed in August:
6.1mph - Average wind speed in September:
6.9mph - Average wind speed in October:
8.9mph - Average wind speed in November:
9.6mph - Average wind speed in December:
9.6mph
The windiest months (with the highest average wind speed) are January and February (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.1mph).
Average humidity
Casey, IL
The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (71%).
Average rainfall
Casey, IL
- Average rainfall in January:
0.75" - Average rainfall in February:
0.47" - Average rainfall in March:
0.79" - Average rainfall in April:
1.54" - Average rainfall in May:
1.34" - Average rainfall in June:
1.38"
- Average rainfall in July:
1.22" - Average rainfall in August:
0.87" - Average rainfall in September:
0.55" - Average rainfall in October:
0.98" - Average rainfall in November:
0.59" - Average rainfall in December:
0.79"
The wettest month (with the highest rainfall) is April (1.54").
The driest month (with the least rainfall) is February (0.47").
Average rainfall days
Casey, IL
- Average rainfall days in January:
6.4 days - Average rainfall days in February:
6 days - Average rainfall days in March:
10 days - Average rainfall days in April:
12.6 days - Average rainfall days in May:
14.9 days - Average rainfall days in June:
12.6 days
- Average rainfall days in July:
12.5 days - Average rainfall days in August:
10.6 days - Average rainfall days in September:
9.5 days - Average rainfall days in October:
7.7 days - Average rainfall days in November:
6.6 days - Average rainfall days in December:
6.5 days
The month with the highest number of rainy days is May (14.9 days).
The month with the least rainy days is February (6 days).
Average snowfall
Casey, IL
The month with the highest snowfall is December (0.47").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days
Casey, IL
- Average snowfall days in January:
5.8 days - Average snowfall days in February:
4.7 days - Average snowfall days in March:
2.7 days - Average snowfall days in April:
0.3 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:
1.4 days - Average snowfall days in December:
4 days
The month with the highest number of snowfall days is January (5.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Casey, IL
- Average daylight in January:
9h and 48min - Average daylight in February:
10h and 42min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 18min - Average daylight in May:
14h and 18min - Average daylight in June:
14h and 54min
- Average daylight in July:
14h and 36min - Average daylight in August:
13h and 42min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 12min - Average daylight in November:
10h and 0min - Average daylight in December:
9h and 30min
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 30min).
- Average sunshine in January:
4h and 6min - Average sunshine in February:
4h and 24min - Average sunshine in March:
6h and 18min - Average sunshine in April:
8h and 6min - Average sunshine in May:
8h and 54min - Average sunshine in June:
10h and 24min
- Average sunshine in July:
10h and 6min - Average sunshine in August:
10h and 0min - Average sunshine in September:
9h and 0min - Average sunshine in October:
6h and 24min - Average sunshine in November:
5h and 18min - Average sunshine in December:
4h and 24min
The month with the most sunshine is June (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days
Casey, IL
- Average sunshine days in January:
20.6 days - Average sunshine days in February:
17.6 days - Average sunshine days in March:
17.3 days - Average sunshine days in April:
14.8 days - Average sunshine days in May:
12.4 days - Average sunshine days in June:
13.4 days
- Average sunshine days in July:
14.3 days - Average sunshine days in August:
16.5 days - Average sunshine days in September:
18.2 days - Average sunshine days in October:
21.2 days - Average sunshine days in November:
21 days - Average sunshine days in December:
20.8 days
The month with the most sunshine days is October (21.2 days).
The month with the least sunshine days is May (12.4 days).
Average UV index
Casey, IL
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover
Casey, IL
The month with the most cloud cover is January (Cloud cover 55).
The month with the least cloud cover is June (Cloud cover 30).
Average visibility
Casey, IL
The months with the highest visibility are January, February, March, April, May, June, July, September, October, November and December (6mi).
The month with the lowest visibility is August (5mi).
