Climate and monthly weather forecastCarbondale, IL
Climate and monthly weather forecast
The climate of Carbondale
The unique climate of Carbondale, Illinois, USA, is classified under the Köppen climate categorization as a Cfa type, also known as the Humid subtropical climate, which is characterized by humid and hot summers followed by mild winters with no dry season. Situated in the Southern part of the state of Illinois, Carbondale offers varied weather patterns through each consecutive month of the year.A detailed viewing of data reveals a notable fluctuation in temperatures within a span of a year. The highest average temperatures range from 39.6°F (4.2°C) in January up to an apex of 87.4°F (30.8°C) in July. Meanwhile, the lowest average temperatures display equivalent variations from a cold 26.2°F (-3.2°C) during January to a warmer 68.7°F (20.4°C) in July. Relative humidity offers less disparity through the year, fluctuating only slightly between 71% in October and 79% in May.
The city of Carbondale is subject to a fair share of rainfall. The lightest and heaviest rainfall levels are recorded in September with 1.85in and April showing 4.49in respectively. Days of rainfall also waver, from 10.3 days in February, to a high of 17.1 days in May. Snowfall is rather less frequent and mainly recorded in the colder months, with January seeing the highest at 1.26in and May to September experiencing no snowfall.
The best time to visit Carbondale
Based on the overall climate conditions, the best time to visit Carbondale would be during the late spring to early summer months. From May to July, visitors will experience temperatures ranging from 75.7°F (24.3°C) up to 87.4°F (30.8°C). These warm temperatures are perfect for outdoor activities and exploration of what the city has to offer. The relative humidity is not excessively high during these months and ranges from 76% to 79%.Noticeably, Carbondale also experiences its maximum daylight hours during this time, with 14.2 hours in May and a high of 14.7 hours in June. Another appealing factor is the sunshine duration during these months, with May offering up to 9.3 hours and June showcasing the longest sunshine span with 10.6 hours.
The worst time to visit Carbondale
Considering the colder temperatures and relatively higher chances of precipitation, the least favorable time for a visit to Carbondale would be during the winter months. The coldest months, from December to February, exhibit temperatures that plummet down to as low as 26.2°F (-3.2°C) in January. Additionally, wintertime in Carbondale is characterized by frequent snowfall, peaking to 1.26in in January.Spring weather in Carbondale
Spring in Carbondale exhibits a moderate climb in the temperature, from a lower average of 38.8°F (3.8°C) in March to a higher average of 48.6°F (9.2°C) in April. Concurrently, it brings about an increase in rainfall levels, peaking at 4.49in in April.Summer weather in Carbondale
The summer months showcase a steady rise in temperature, reaching the climax of Carbondale's heat with temperatures rising to 87.4°F (30.8°C) in July. Rainfall during these months remains moderate, showing only a minor drop from 3.82in in May to 3.11in in July.Autumn weather in Carbondale
Autumn begins with a pleasantly warm temperature of 80.4°F (26.9°C) in September which drops to a cooler 54°F (12.2°C) in November. Rainfall decreases during this period, with September seeing the lowest rainfall of 1.85in for the year.Winter weather in Carbondale
As winter settles in, temperatures dip with the lowest average of 26.2°F (-3.2°C) in January. The winter periods also mark the occurrence of frequent snowfall, with January registering the highest snowfall of 1.26in.Weather in January
January in Carbondale, Illinois, commences the year with temperatures mostly between 26.2°F (-3.2°C) and 39.6°F (4.2°C), showing considerable cold. The city encounters a fair amount of snow during this month. Rainfall is also something to keep in mind, with wet weather relatively frequent. Weather in January »Weather in February
With temperatures slightly on the rise from 30°F (-1.1°C) to 43.7°F (6.5°C), the weather in February in Carbondale, Illinois, starts to show some signs of change. Although snowfall is not a rare phenomenon, it is relatively less compared to January. Weather in February »Weather in March
Weather in March in Carbondale, Illinois, swings towards the beginning of Spring. The months edges on warmth with temperatures climbing from 38.8°F (3.8°C) to 55.2°F (12.9°C). Despite the temperature shift, rainfall remains relatively stable, consequently affecting the ground conditions. Weather in March »Weather in April
April weather in Carbondale, Illinois, is indicative of Spring, with temperatures advancing from 48.6°F (9.2°C) to 66.2°F (19°C). Rainfall reaches its peak for the year with 4.49" (114mm) on average, providing nourishment for the blooming vegetation. Weather in April »Weather in May
May in Carbondale, Illinois, welcomes Summer as temperatures consistently reach between 58.3°F (14.6°C) and 75.7°F (24.3°C). Despite the rise in temperature, relief is provided by the gentle breeze that is characteristic of this period. Weather in May »Weather in June
The Summer season is firmly rooted in Carbondale, Illinois, in June, with temperature fluctuation noticed from 66.4°F (19.1°C) to 84.7°F (29.3°C). This month earmarks the year’s highest recorded sunshine hours of 10.6, making the days abundant in natural light. Weather in June »Weather in July
At the height of summer, Carbondale, Illinois, sees temperatures soaring between 68.7°F (20.4°C) and a sweltering 87.4°F (30.8°C) in July. It is notable that this month carries the peak temperature for the year. Even though the cloudy days are minimal, rainfall is quite common. Weather in July »Weather in August
August weather in Carbondale, Illinois, remains similar to July, with temperatures generally ranging between 66.4°F (19.1°C) and 85.8°F (29.9°C). This month sees a decrease in rainfall levels although the breeze tends to pick up just slightly. Weather in August »Weather in September
September brings the onset of fall to Carbondale, Illinois, with temperatures dropping from 60.3°F (15.7°C) to 80.4°F (26.9°C). The decrease in rainfall to an average of 1.85" (47mm) marks the driest month of the year. Less cloud cover coupled with increased visibility may lead to more sunshine and clear skies. Weather in September »Weather in October
October in Carbondale, Illinois, showcases a clear shift towards autumn, with temperatures varying between 49.3°F (9.6°C) and 67.5°F (19.7°C). This month witnesses a variable range of weather conditions, with no extremes on any parameter. Weather in October »Weather in November
The weather in November in Carbondale, Illinois, transitions into winter. Temperatures start to drop down again, hovering from 38.7°F (3.7°C) to 54°F (12.2°C). While the rain continues to be a constant companion, signs of the first snowfall may appear. Weather in November »Weather in December
December in Carbondale, Illinois, welcomes winter in earnest, with temperatures confined between 31.8°F (-0.1°C) and 43.7°F (6.5°C). Snow becomes a prominent feature once again, averaging 1.26" (32mm) for the month. Limited rainfall and shorter daylight hours indicate typical winter weather patterns. 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
January, on average, is the coldest month, registering a high temperature of 39.6°F (4.2°C) and a low of 26.2°F (-3.2°C).
In Carbondale, during the entire year, the rain falls for 158.6 days and collects up to 34.69" (881mm) of precipitation.
Months with snowfall in Carbondale, Illinois, are January through April, October through December.
In Carbondale, during the entire year, snow falls for 15.9 days and aggregates up to 5.71" (145mm) of snow.
The month with the least sunshine is January, with an average of 4.7h of sunshine.
The months with the lowest UV index in Carbondale are January, February, November and December, with an average maximum UV index of 2.
February is the month with the most snowfall in Carbondale. Snow falls for 4.8 days and accumulates 1.73" (44mm) of snow.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Carbondale, Illinois, 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 in Carbondale is April, when the rain falls for 15.5 days and typically aggregates up to 4.49" (114mm) of precipitation.
The most humid month in Carbondale, Illinois, is May, with an average relative humidity of 79%.
May through September are months without snowfall.
May through August, with an average maximum UV index of 6, are months with the highest UV index.
With an average of 14h and 42min of daylight, June has the longest days of the year in Carbondale.
June has the most sunshine of the year in Carbondale, with an average of 10.6h of sunshine.
July proves to be the warmest month, recording an average peak temperature of 87.4°F (30.8°C) and a minimum temperature of 68.7°F (20.4°C).
September is the month with the least rainfall in Carbondale. Rain falls for 12.7 days and accumulates 1.85" (47mm) of precipitation.
October is the least humid month, with an average relative humidity of 71%.
December has the shortest days of the year in Carbondale, with an average of 9h and 36min of daylight.
Average temperature
Carbondale, IL
The warmest month (with the highest average high temperature) is July (87.4°F).
The month with the lowest average high temperature is January (39.6°F).
The month with the highest average low temperature is July (68.7°F).
The coldest month (with the lowest average low temperature) is January (26.2°F).
Average pressure
Carbondale, IL
- Average pressure in January:
30.16"Hg - Average pressure in February:
30.12"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.95"Hg - Average pressure in May:
29.97"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:
30.02"Hg - Average pressure in October:
30.04"Hg - Average pressure in November:
30.14"Hg - Average pressure in December:
30.14"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed
Carbondale, IL
- Average wind speed in January:
9.4mph - Average wind speed in February:
9.3mph - Average wind speed in March:
9.1mph - Average wind speed in April:
8.9mph - Average wind speed in May:
7.5mph - Average wind speed in June:
6.5mph
- Average wind speed in July:
5.7mph - Average wind speed in August:
5.6mph - Average wind speed in September:
6.2mph - Average wind speed in October:
7.8mph - Average wind speed in November:
8.5mph - Average wind speed in December:
8.6mph
The windiest month (with the highest average wind speed) is January (9.4mph).
The calmest month (with the lowest average wind speed) is August (5.6mph).
Average humidity
Carbondale, IL
The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is October (71%).
Average rainfall
Carbondale, IL
- Average rainfall in January:
2.17" - Average rainfall in February:
2.36" - Average rainfall in March:
3.11" - Average rainfall in April:
4.49" - Average rainfall in May:
3.82" - Average rainfall in June:
3.43"
The wettest month (with the highest rainfall) is April (4.49").
The driest month (with the least rainfall) is September (1.85").
Average rainfall days
Carbondale, IL
- Average rainfall days in January:
9.4 days - Average rainfall days in February:
10.3 days - Average rainfall days in March:
15.2 days - Average rainfall days in April:
15.5 days - Average rainfall days in May:
17.1 days - Average rainfall days in June:
16 days
- Average rainfall days in July:
16.8 days - Average rainfall days in August:
13.9 days - Average rainfall days in September:
12.7 days - Average rainfall days in October:
10.8 days - Average rainfall days in November:
10.6 days - Average rainfall days in December:
10.3 days
The month with the highest number of rainy days is May (17.1 days).
The month with the least rainy days is January (9.4 days).
Average snowfall
Carbondale, IL
The month with the highest snowfall is February (1.73").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Carbondale, IL
- Average snowfall days in January:
4.8 days - Average snowfall days in February:
4.8 days - Average snowfall days in March:
1.8 days - Average snowfall days in April:
0.4 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:
0.1 days - Average snowfall days in November:
1 days - Average snowfall days in December:
3 days
The months with the highest number of snowfall days are January and February (4.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Carbondale, IL
- Average daylight in January:
9h and 54min - Average daylight in February:
10h and 48min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 12min - Average daylight in May:
14h and 12min - Average daylight in June:
14h and 42min
- Average daylight in July:
14h and 30min - Average daylight in August:
13h and 36min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 12min - Average daylight in November:
10h and 6min - Average daylight in December:
9h and 36min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in January:
4h and 42min - Average sunshine in February:
4h and 48min - Average sunshine in March:
6h and 30min - Average sunshine in April:
8h and 42min - Average sunshine in May:
9h and 18min - Average sunshine in June:
10h and 36min
- Average sunshine in July:
10h and 30min - Average sunshine in August:
10h and 18min - Average sunshine in September:
9h and 30min - Average sunshine in October:
6h and 30min - Average sunshine in November:
5h and 36min - Average sunshine in December:
4h and 48min
The month with the most sunshine is June (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).
Average sunshine days
Carbondale, IL
- Average sunshine days in January:
17.7 days - Average sunshine days in February:
13.6 days - Average sunshine days in March:
13.4 days - Average sunshine days in April:
12.3 days - Average sunshine days in May:
11.3 days - Average sunshine days in June:
12.2 days
- Average sunshine days in July:
11.7 days - Average sunshine days in August:
14.2 days - Average sunshine days in September:
16 days - Average sunshine days in October:
18.5 days - Average sunshine days in November:
17.9 days - Average sunshine days in December:
18.4 days
The month with the most sunshine days is October (18.5 days).
The month with the least sunshine days is May (11.3 days).
Average UV index
Carbondale, IL
The months with the highest UV index are May, 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
Carbondale, IL
The month with the most cloud cover is February (Cloud cover 50).
The months with the least cloud cover are June and August (Cloud cover 27).
Average visibility
Carbondale, IL
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
