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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 Cortland, Illinois, is a freezing cold winter month, with an average temperature varying between 15.1°F (-9.4°C) and 27°F (-2.8°C). January, recording an average high temperature of 27°F (-2.8°C) and a low temperature of 15.1°F (-9.4°C), is Cortland's coldest month. Weather in January »
Weather in February
The last month of the winter, February, is also a subzero cold month in Cortland, Illinois, with an average temperature fluctuating between 31.1°F (-0.5°C) and 18.1°F (-7.7°C). Transitioning into February, Cortland experiences an average high-temperature of a still freezing cold 31.1°F (-0.5°C), marking a minor shift from the preceding month. Weather in February »
Weather in March
March, the first month of the spring in Cortland, is a frosty month, with an average temperature fluctuating between 44.6°F (7°C) and 30.2°F (-1°C). With the transition into March, Cortland experiences an increase in average high-temperatures, moving up from a freezing cold 31.1°F (-0.5°C) in February to a chilly 44.6°F (7°C). Weather in March »
Weather in April
April in Cortland, Illinois, is a mild spring month, with temperature in the range of an average high of 56.7°F (13.7°C) and an average low of 39.9°F (4.4°C). Observing a rise in April, the average high-temperature goes from March's chilly 44.6°F (7°C) to a refreshing 56.7°F (13.7°C). Weather in April »
Weather in May
The last month of the spring, May, is a pleasant month in Cortland, Illinois, with an average temperature fluctuating between 51.4°F (10.8°C) and 68.7°F (20.4°C). May's arrival signals an increase in average high-temperatures, moving from April's refreshing 56.7°F (13.7°C) to an agreeable 68.7°F (20.4°C). Weather in May »
Weather in June
The first month of the summer, June, is a moderately hot month in Cortland, Illinois, with an average temperature ranging between min 60.1°F (15.6°C) and max 77.7°F (25.4°C). The shift from May to June is marked by an increase in the average high-temperature, moving from a pleasant 68.7°F (20.4°C) to a moderately hot 77.7°F (25.4°C). Weather in June »
Weather in July
July, the same as June, is another warm summer month in Cortland, Illinois, with an average temperature fluctuating between 63.1°F (17.3°C) and 80.2°F (26.8°C). Cortland experiences its highest temperatures in July, with an average peak of 80.2°F (26.8°C) and a low of 63.1°F (17.3°C). Weather in July »
Weather in August
August, the last month of the summer in Cortland, is another warm month, with an average temperature ranging between min 61.2°F (16.2°C) and max 78.4°F (25.8°C). The initiation of August records an average high-temperature of a still moderately hot 78.4°F (25.8°C), displaying a near consistency with the previous month. Weather in August »
Weather in September
September, the first month of the autumn in Cortland, is still a pleasant month, with an average temperature varying between 73°F (22.8°C) and 54.5°F (12.5°C). September signifies a minor drop in average high-temperature, transitioning from a moderately hot 78.4°F (25.8°C) in August to an agreeable 73°F (22.8°C). Weather in September »
Weather in October
October, the same as September, in Cortland, Illinois, is another refreshing autumn month, with an average temperature fluctuating between 59.9°F (15.5°C) and 44.1°F (6.7°C). Cortland's progression into October involves a drop in the average high-temperature, receding from a pleasant 73°F (22.8°C) in September to a refreshing 59.9°F (15.5°C). Weather in October »
Weather in November
The last month of the autumn, November, is another chilly month in Cortland, Illinois, with temperature in the range of an average high of 45.3°F (7.4°C) and an average low of 32°F (0°C). With the beginning of November, Cortland's average high-temperature experiences a significant decrease, moving from a mild 59.9°F (15.5°C) in October to a frosty 45.3°F (7.4°C). Weather in November »
Weather in December
December, the first month of the winter in Cortland, is still a cold month, with temperature in the range of an average high of 33.1°F (0.6°C) and an average low of 23°F (-5°C). December comes with a decrease in the average high-temperature, falling from a chilly 45.3°F (7.4°C) in November to an icy 33.1°F (0.6°C). Weather in December »
Updated: Jul 29, 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 time of the year is the coldest?
January is the month when Cortland, Illinois, sees the average lowest temperatures, with a high of 27°F (-2.8°C) and a low of 15.1°F (-9.4°C).
What are the most humid months?
January and July, with an average relative humidity of 85%, are most humid months.
How much does it rain?
In Cortland, Illinois, during the entire year, the rain falls for 152.6 days and collects up to 32.09" (815mm) of precipitation.
When does it snow?
January through May, October through December are months with snowfall.
What is the snowiest month?
The month with the most snowfall in Cortland is January, when snow falls for 11.8 days and typically aggregates up to 5.55" (141mm) of snow.
How many days does it snow?
Throughout the year, there are 44.3 snowfall days, and 17.87" (454mm) of snow is accumulated.
What is the month with the least sunshine?
With an average of 3.6h of sunshine, January has the least sunshine of the year.
What are the months with the lowest UV index?
The months with the lowest UV index are January and December, with an average maximum UV index of 1.
What is the driest month?
February is the month with the least rainfall. Rain falls for 4.7 days and accumulates 1.65" (42mm) of precipitation.
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 least humid month?
April and October, with an average relative humidity of 75%, are the least humid months.
What is the wettest month?
May is the month with the most rainfall. Rain falls for 18.3 days and accumulates 4.37" (111mm) of precipitation.
When it does not snow?
In Cortland, snow does not fall in June through September.
When are the longest days?
With an average of 15h and 12min of daylight, June has the longest days of the year.
When is the highest UV index?
The months with the highest UV index in Cortland are June and August, with an average maximum UV index of 6.
What is the hottest time of year?
The warmest month is July, with an average high-temperature of 80.2°F (26.8°C) and an average low-temperature of 63.1°F (17.3°C).
What month has the most sunshine?
July has the most sunshine of the year, with an average of 9.6h of sunshine.
What is the month with the shortest days?
With an average of 9h and 12min of daylight, December has the shortest days of the year.
Average temperature
Cortland, IL
The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is January (27°F).
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (15.1°F).
Average pressure
Cortland, IL
- Average pressure in January:
30.11"Hg - Average pressure in February:
30.1"Hg - Average pressure in March:
30.09"Hg - Average pressure in April:
29.95"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"Hg - Average pressure in November:
30.09"Hg - Average pressure in December:
30.1"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed
Cortland, IL
- Average wind speed in January:
9.9mph - Average wind speed in February:
9.9mph - Average wind speed in March:
9.7mph - Average wind speed in April:
10mph - Average wind speed in May:
8.5mph - Average wind speed in June:
7.4mph
- Average wind speed in July:
6.4mph - Average wind speed in August:
6.2mph - Average wind speed in September:
7.2mph - Average wind speed in October:
8.9mph - Average wind speed in November:
9.6mph - Average wind speed in December:
9.3mph
The windiest month (with the highest average wind speed) is April (10mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).
Average humidity
Cortland, IL
The months with the highest relative humidity are January and July (85%).
The months with the lowest relative humidity are April and October (75%).
Average rainfall
Cortland, IL
- Average rainfall in January:
1.81" - Average rainfall in February:
1.65" - Average rainfall in March:
2.05" - Average rainfall in April:
3.86" - Average rainfall in May:
4.37" - Average rainfall in June:
4.13"
- Average rainfall in July:
3.15" - Average rainfall in August:
2.72" - Average rainfall in September:
2.24" - Average rainfall in October:
2.68" - Average rainfall in November:
1.73" - Average rainfall in December:
1.69"
The wettest month (with the highest rainfall) is May (4.37").
The driest month (with the least rainfall) is February (1.65").
Average rainfall days
Cortland, IL
- Average rainfall days in January:
5.7 days - Average rainfall days in February:
4.7 days - Average rainfall days in March:
12.2 days - Average rainfall days in April:
16.4 days - Average rainfall days in May:
18.3 days - Average rainfall days in June:
18.1 days
- Average rainfall days in July:
18.1 days - Average rainfall days in August:
15.8 days - Average rainfall days in September:
12.2 days - Average rainfall days in October:
13.1 days - Average rainfall days in November:
9.5 days - Average rainfall days in December:
8.5 days
The month with the highest number of rainy days is May (18.3 days).
The month with the least rainy days is February (4.7 days).
Average snowfall
Cortland, IL
- Average snowfall in January:
5.55" - Average snowfall in February:
3.86" - Average snowfall in March:
2.17" - Average snowfall in April:
1.34" - Average snowfall in May:
0.04" - Average snowfall in June:
0"
The month with the highest snowfall is January (5.55").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Cortland, IL
- Average snowfall days in January:
11.8 days - Average snowfall days in February:
10.6 days - Average snowfall days in March:
5.6 days - Average snowfall days in April:
1.7 days - Average snowfall days in May:
0.1 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:
0.8 days - Average snowfall days in November:
3.7 days - Average snowfall days in December:
10 days
The month with the highest number of snowfall days is January (11.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Cortland, IL
- Average daylight in January:
9h and 3min - 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 4min - 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 1min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in January:
3h and 4min - Average sunshine in February:
3h and 5min - Average sunshine in March:
6h and 0min - Average sunshine in April:
7h and 2min - Average sunshine in May:
8h and 2min - Average sunshine in June:
9h and 3min
- Average sunshine in July:
9h and 4min - Average sunshine in August:
9h and 3min - Average sunshine in September:
8h and 3min - Average sunshine in October:
5h and 2min - Average sunshine in November:
5h and 0min - Average sunshine in December:
3h and 5min
The month with the most sunshine is July (Average sunshine: 9h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days
Cortland, IL
- Average sunshine days in January:
14.6 days - Average sunshine days in February:
13.4 days - Average sunshine days in March:
14.4 days - Average sunshine days in April:
10.8 days - Average sunshine days in May:
10.8 days - Average sunshine days in June:
10.3 days
- Average sunshine days in July:
10.3 days - Average sunshine days in August:
12.9 days - Average sunshine days in September:
15.7 days - Average sunshine days in October:
15.4 days - Average sunshine days in November:
17.2 days - Average sunshine days in December:
15.5 days
The month with the most sunshine days is November (17.2 days).
The months with the least sunshine days are June and July (10.3 days).
Average UV index
Cortland, IL
The months with the highest UV index are June and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover
Cortland, IL
The month with the most cloud cover is January (Cloud cover 63).
The months with the least cloud cover are August and September (Cloud cover 35).
Average visibility
Cortland, IL
The months with the highest visibility are March, April, May, June, October, November and December (6mi).
The months with the lowest visibility are January, February, July, August and September (5mi).
Cortland, Illinois, USA
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