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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, is a wintry winter month in Monticello, Illinois, with an average temperature fluctuating between 32.4°F (0.2°C) and 20.3°F (-6.5°C). During the coldest month, January, temperatures average a high of 32.4°F (0.2°C) and a low of 20.3°F (-6.5°C). Weather in January »
Weather in February
The last month of the winter, February, is also a wintry month in Monticello, Illinois, with an average temperature ranging between min 24.3°F (-4.3°C) and max 37.2°F (2.9°C). The transition into February shows a subtle variation to a still cold 37.2°F (2.9°C) from January's 32.4°F (0.2°C) in the average high-temperature. Weather in February »
Weather in March
March, the first month of the spring in Monticello, is a frosty month, with an average temperature fluctuating between 34.9°F (1.6°C) and 49.6°F (9.8°C). Monticello in March experiences an increase in the average high-temperature, moving from February's icy 37.2°F (2.9°C) to a frosty 49.6°F (9.8°C). Weather in March »
Weather in April
April in Monticello, Illinois, is a comfortable spring month, with an average temperature varying between 45.9°F (7.7°C) and 61.5°F (16.4°C). With the onset of April, Monticello's average high-temperature sees a rise, moving from March's chilly 49.6°F (9.8°C) to a comfortable 61.5°F (16.4°C). Weather in April »
Weather in May
The last month of the spring, May, is a pleasant month in Monticello, Illinois, with an average temperature varying between 56.3°F (13.5°C) and 72.7°F (22.6°C). The arrival of May brings an increase in high-temperatures, moving from a refreshing 61.5°F (16.4°C) in April to a pleasant 72.7°F (22.6°C). Weather in May »
Weather in June
The first month of the summer, June, is a moderately hot month in Monticello, Illinois, with temperature in the range of an average high of 80.2°F (26.8°C) and an average low of 63.9°F (17.7°C). The beginning of June marks a minor shift in the average high-temperature, moving from May's agreeable 72.7°F (22.6°C) to a warm 80.2°F (26.8°C). Weather in June »
Weather in July
July, the same as June, is another warm summer month in Monticello, Illinois, with temperature in the range of an average high of 81.9°F (27.7°C) and an average low of 64.9°F (18.3°C). July tends to be the warmest month, with temperatures averaging a daily high of 81.9°F (27.7°C) and a low of 64.9°F (18.3°C). In July, the average heat index is calculated to be a hot 89.6°F (32°C). Weather in July »
Weather in August
August, the last month of the summer in Monticello, is another warm month, with an average temperature fluctuating between 63.3°F (17.4°C) and 81°F (27.2°C). Monticello's shift into August is marked by a subtle change to a still warm 81°F (27.2°C) from July's 81.9°F (27.7°C) in temperature. Weather in August »
Weather in September
September, the first month of the autumn in Monticello, is still a warm month, with an average temperature varying between 76.6°F (24.8°C) and 58.3°F (14.6°C). The shift into September finds Monticello, Illinois, at an average high-temperature of a still warm 76.6°F (24.8°C), closely comparable to August's conditions. Weather in September »
Weather in October
October, the same as September, is another refreshing autumn month in Monticello, Illinois, with temperature in the range of an average low of 48°F (8.9°C) and an average high of 63.5°F (17.5°C). Monticello's average high-temperature decreases in October, falling from a warm 76.6°F (24.8°C) in September to an enjoyable 63.5°F (17.5°C). Weather in October »
Weather in November
The last month of the autumn, November, is also a frosty month in Monticello, Illinois, with an average temperature varying between 36°F (2.2°C) and 49.1°F (9.5°C). Monticello's transition into November marks a considerable drop in the average high-temperature, moving down from a comfortable 63.5°F (17.5°C) in October to a chilly 49.1°F (9.5°C). Weather in November »
Weather in December
The first month of the winter, December, is still a cold month in Monticello, Illinois, with an average temperature varying between 37.9°F (3.3°C) and 27.5°F (-2.5°C). December brings a minor decrease, with the average high-temperature reducing from a chilly 49.1°F (9.5°C) in November to a cold 37.9°F (3.3°C). Weather in December »
Updated: Aug 26, 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?
Monticello notes the coldest temperatures in January, with a average high of 32.4°F (0.2°C) and a low of 20.3°F (-6.5°C).
How many days does it rain?
In Monticello, during the entire year, the rain falls for 127.9 days and collects up to 16.61" (422mm) of precipitation.
When does it snow?
Months with snowfall are January through April, November and December.
What is the snowiest month in Monticello?
January is the month with the most snowfall. Snow falls for 8.3 days and accumulates 2.05" (52mm) of snow.
How much does it snow?
In Monticello, during the entire year, snow falls for 23.2 days and aggregates up to 5.83" (148mm) of snow.
What is the month with the least sunshine?
The month with the least sunshine is January, with an average of 3.9h of sunshine.
When is the lowest UV index?
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index.
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 wettest month?
The month with the most rainfall is May, when the rain falls for 16.3 days and typically aggregates up to 2.09" (53mm) of precipitation.
When it does not snow?
In Monticello, snow does not fall in May through October.
When are the longest days?
June has the longest days of the year, with an average of 15h and 0min of daylight.
What month has the most sunshine?
With an average of 10.1h of sunshine, June has the most sunshine of the year.
What is the month with the highest UV index in Monticello?
June through August, with an average maximum UV index of 6, are months with the highest UV index.
What are the warmest months?
With average high and low temperatures of 81.9°F (27.7°C) and 64.9°F (18.3°C) respectively, July is Monticello's warmest month.
What is the most humid month?
With an average relative humidity of 85%, July is the most humid month.
What is the least humid month?
The least humid month is October, with an average relative humidity of 70%.
What is the driest month?
December is the month with the least rainfall. Rain falls for 7.4 days and accumulates 0.91" (23mm) of precipitation.
What is the month with the shortest days?
December has the shortest days of the year, with an average of 9h and 24min of daylight.
Average temperature
Monticello, IL
The warmest month (with the highest average high temperature) is July (81.9°F).
The month with the lowest average high temperature is January (32.4°F).
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (20.3°F).
Average pressure
Monticello, 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
Monticello, IL
- Average wind speed in January:
10.9mph - Average wind speed in February:
10.8mph - 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:
7.7mph
- 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:
9.6mph - Average wind speed in November:
10.3mph - Average wind speed in December:
10.2mph
The windiest month (with the highest average wind speed) is January (10.9mph).
The calmest month (with the lowest average wind speed) is August (6.4mph).
Average humidity
Monticello, IL
The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (70%).
Average rainfall
Monticello, IL
- Average rainfall in January:
1.1" - Average rainfall in February:
0.94" - Average rainfall in March:
1.54" - Average rainfall in April:
1.97" - Average rainfall in May:
2.09" - Average rainfall in June:
1.93"
- Average rainfall in July:
1.5" - Average rainfall in August:
1.54" - Average rainfall in September:
0.98" - Average rainfall in October:
1.18" - Average rainfall in November:
0.94" - Average rainfall in December:
0.91"
The wettest month (with the highest rainfall) is May (2.09").
The driest month (with the least rainfall) is December (0.91").
Average rainfall days
Monticello, IL
- Average rainfall days in January:
5.3 days - Average rainfall days in February:
5.2 days - Average rainfall days in March:
11.2 days - Average rainfall days in April:
12.6 days - Average rainfall days in May:
16.3 days - Average rainfall days in June:
14.3 days
- Average rainfall days in July:
14.9 days - Average rainfall days in August:
12.4 days - Average rainfall days in September:
10.2 days - Average rainfall days in October:
9.6 days - Average rainfall days in November:
8.5 days - Average rainfall days in December:
7.4 days
The month with the highest number of rainy days is May (16.3 days).
The month with the least rainy days is February (5.2 days).
Average snowfall
Monticello, IL
The month with the highest snowfall is January (2.05").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days
Monticello, IL
- Average snowfall days in January:
8.3 days - Average snowfall days in February:
5.8 days - Average snowfall days in March:
2.5 days - Average snowfall days in April:
0.6 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:
1.5 days - Average snowfall days in December:
4.5 days
The month with the highest number of snowfall days is January (8.3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Monticello, 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:
3h and 5min - Average sunshine in February:
4h and 1min - Average sunshine in March:
6h and 1min - 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 4min - 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 2min
The month with the most sunshine is June (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days
Monticello, IL
- Average sunshine days in January:
18.8 days - Average sunshine days in February:
17.6 days - Average sunshine days in March:
16.9 days - Average sunshine days in April:
15.2 days - Average sunshine days in May:
12.3 days - Average sunshine days in June:
12.9 days
- Average sunshine days in July:
13.3 days - Average sunshine days in August:
15.9 days - Average sunshine days in September:
17.6 days - Average sunshine days in October:
19.5 days - Average sunshine days in November:
19.6 days - Average sunshine days in December:
19.1 days
The month with the most sunshine days is November (19.6 days).
The month with the least sunshine days is May (12.3 days).
Average UV index
Monticello, 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
Monticello, IL
The month with the most cloud cover is January (Cloud cover 57).
The months with the least cloud cover are June, August and September (Cloud cover 32).
Average visibility
Monticello, 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).
Monticello, Illinois, USA
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