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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 an icy winter month in Dennison, Illinois, with an average temperature fluctuating between 34.3°F (1.3°C) and 22.3°F (-5.4°C). The coldest time of the year is January, with temperatures averaging a high of 34.3°F (1.3°C) and a low of 22.3°F (-5.4°C). Weather in January »
Weather in February
February, the last month of the winter in Dennison, is another cold month, with an average temperature fluctuating between 26.1°F (-3.3°C) and 39.4°F (4.1°C). The shift into February records an average high-temperature of a still icy 39.4°F (4.1°C), subtly varied from January's 34.3°F (1.3°C). Weather in February »
Weather in March
March, the first month of the spring in Dennison, is a fresh month, with an average temperature ranging between min 36.1°F (2.3°C) and max 51.4°F (10.8°C). A rise in the average high-temperature is observed during March, moving from a cold 39.4°F (4.1°C) in February to a cool 51.4°F (10.8°C). Weather in March »
Weather in April
April in Dennison, Illinois, is an enjoyable spring month, with an average temperature ranging between min 46°F (7.8°C) and max 62.4°F (16.9°C). April brings a temperature change, with average high-temperatures moving from March's cool 51.4°F (10.8°C) to an enjoyable 62.4°F (16.9°C). Weather in April »
Weather in May
The last month of the spring, May, is a pleasant month in Dennison, Illinois, with an average temperature ranging between min 55.9°F (13.3°C) and max 73°F (22.8°C). May's arrival signals a temperature shift, moving from a comfortable 62.4°F (16.9°C) in April to a pleasant 73°F (22.8°C). Weather in May »
Weather in June
The first month of the summer, June, is a warm month in Dennison, Illinois, with an average temperature varying between 63.9°F (17.7°C) and 81°F (27.2°C). A subtle rise in the average high-temperature is observed during June, adjusting from an agreeable 73°F (22.8°C) in May to a moderately hot 81°F (27.2°C). Weather in June »
Weather in July
July, like June, in Dennison, Illinois, is another warm summer month, with an average temperature ranging between min 65.8°F (18.8°C) and max 82.8°F (28.2°C). July, with its average high-temperature of 82.8°F (28.2°C) and an average low-temperature of 65.8°F (18.8°C), holds the record as the warmest month. In July, the heat index is computed to be a tropical 91.4°F (33°C). Weather in July »
Weather in August
The last month of the summer, August, is also a moderately hot month in Dennison, Illinois, with an average temperature fluctuating between 64°F (17.8°C) and 81.7°F (27.6°C). August's climate shows a minor adjustment in average high-temperatures to a still moderately hot 81.7°F (27.6°C) from July's 82.8°F (28.2°C). Weather in August »
Weather in September
The first month of the autumn, September, is still a warm month in Dennison, Illinois, with temperature in the range of an average high of 77.4°F (25.2°C) and an average low of 58.6°F (14.8°C). Dennison, Illinois, registers an average high-temperature of a still moderately hot 77.4°F (25.2°C) at the commencement of September, closely related to the preceding month. Weather in September »
Weather in October
October, like September, in Dennison, Illinois, is another comfortable autumn month, with an average temperature fluctuating between 64.6°F (18.1°C) and 47.7°F (8.7°C). The arrival of October signals a shift in temperature, down from a warm 77.4°F (25.2°C) in September to a comfortable 64.6°F (18.1°C). Weather in October »
Weather in November
The last month of the autumn, November, is another cool month in Dennison, Illinois, with an average temperature fluctuating between 50.4°F (10.2°C) and 36.3°F (2.4°C). Dennison in November undergoes a mild reduction in the average high-temperature, shifting from October's refreshing 64.6°F (18.1°C) to a cool 50.4°F (10.2°C). Weather in November »
Weather in December
The first month of the winter, December, is still a cold month in Dennison, Illinois, with an average temperature fluctuating between 28.4°F (-2°C) and 39.6°F (4.2°C). In Dennison, the average high-temperature in December drops from a cool 50.4°F (10.2°C) in November to an icy 39.6°F (4.2°C). Weather in December »
[Resources]Frequently asked questions
What month is the coldest in Dennison?
The coldest temperatures in Dennison, Illinois, occur during January, when averages reach a peak of 34.3°F (1.3°C) and a low of 22.3°F (-5.4°C).
How much does it rain in Dennison?
In Dennison, during the entire year, the rain falls for 159.3 days and collects up to 34.41" (874mm) of precipitation.
When does it snow in Dennison?
January through April, November and December are months with snowfall.
What is the snowiest month in Dennison?
The month with the most snowfall is January, when snow falls for 7.8 days and typically aggregates up to 2.56" (65mm) of snow.
How many days does it snow in Dennison?
Throughout the year, there are 24.7 snowfall days, and 8.66" (220mm) of snow is accumulated.
What is the month with the least sunshine in Dennison?
The months with the least sunshine are January and December, with an average of 4.3h of sunshine.
What are the months with the lowest UV index in Dennison?
The months with the lowest UV index in Dennison, Illinois, are January, February, October through December, with an average maximum UV index of 2.
When is Daylight Saving Time (DST) in Dennison?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Dennison, 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.
What is the rainiest month in Dennison?
April is the month with the most rainfall in Dennison, Illinois. Rain falls for 16 days and accumulates 4.96" (126mm) of precipitation.
When it does not snow in Dennison?
In Dennison, snow does not fall in May through October.
When are the longest days in Dennison?
The month with the longest days in Dennison, Illinois, is June, with an average of 14h and 54min of daylight.
What month has the most sunshine in Dennison?
The month with the most sunshine in Dennison, Illinois, is June, with an average of 10.2h of sunshine.
When is the highest UV index in Dennison?
June through August, with an average maximum UV index of 6, are months with the highest UV index.
What part of the year is the hottest in Dennison?
Dennison reaches its average highest temperatures in July, measuring 82.8°F (28.2°C) at the peak and 65.8°F (18.8°C) at the lowest.
What is the most humid month in Dennison?
With an average relative humidity of 82%, July is the most humid month.
What is the driest month in Dennison?
September is the month with the least rainfall. Rain falls for 12.5 days and accumulates 1.81" (46mm) of precipitation.
What is the least humid month in Dennison?
The least humid month in Dennison, Illinois, is October, with an average relative humidity of 72%.
What is the month with the shortest days in Dennison?
With an average of 9h and 24min of daylight, December has the shortest days of the year in Dennison, Illinois.
Average temperature
Dennison, IL
The warmest month (with the highest average high temperature) is July (82.8°F).
The month with the lowest average high temperature is January (34.3°F).
The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (22.3°F).
Average pressure
Dennison, 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:
29.97"Hg - Average pressure in June:
29.93"Hg
- Average pressure in July:
29.98"Hg - Average pressure in August:
29.99"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
Dennison, IL
- Average wind speed in January:
10mph - Average wind speed in February:
10.1mph - Average wind speed in March:
9.9mph - Average wind speed in April:
9.9mph - Average wind speed in May:
8.2mph - Average wind speed in June:
7.1mph
- Average wind speed in July:
6mph - Average wind speed in August:
6mph - Average wind speed in September:
6.8mph - Average wind speed in October:
8.6mph - Average wind speed in November:
9.3mph - Average wind speed in December:
9.2mph
The windiest month (with the highest average wind speed) is February (10.1mph).
The calmest months (with the lowest average wind speed) are July and August (6mph).
Average humidity
Dennison, IL
The month with the highest relative humidity is July (82%).
The month with the lowest relative humidity is October (72%).
Average rainfall
Dennison, IL
- Average rainfall in January:
2.44" - Average rainfall in February:
1.93" - Average rainfall in March:
2.76" - Average rainfall in April:
4.96" - Average rainfall in May:
4.06" - Average rainfall in June:
3.94"
- Average rainfall in July:
3.11" - Average rainfall in August:
2.56" - Average rainfall in September:
1.81" - Average rainfall in October:
2.44" - Average rainfall in November:
2.09" - Average rainfall in December:
2.32"
The wettest month (with the highest rainfall) is April (4.96").
The driest month (with the least rainfall) is September (1.81").
Average rainfall days
Dennison, IL
- Average rainfall days in January:
8.2 days - Average rainfall days in February:
8.7 days - Average rainfall days in March:
13.8 days - Average rainfall days in April:
16 days - Average rainfall days in May:
20.6 days - Average rainfall days in June:
17 days
- Average rainfall days in July:
17.7 days - Average rainfall days in August:
14.6 days - Average rainfall days in September:
12.5 days - Average rainfall days in October:
11.3 days - Average rainfall days in November:
9.4 days - Average rainfall days in December:
9.5 days
The month with the highest number of rainy days is May (20.6 days).
The month with the least rainy days is January (8.2 days).
Average snowfall
Dennison, IL
The month with the highest snowfall is January (2.56").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days
Dennison, IL
- Average snowfall days in January:
7.8 days - Average snowfall days in February:
5.8 days - Average snowfall days in March:
3.3 days - Average snowfall days in April:
0.5 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:
1.8 days - Average snowfall days in December:
5.5 days
The month with the highest number of snowfall days is January (7.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Dennison, IL
- Average daylight in January:
9h and 5min - 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:
14h and 5min
- 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: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in January:
4h and 2min - Average sunshine in February:
5h and 3min - Average sunshine in March:
6h and 2min - Average sunshine in April:
6h and 5min - Average sunshine in May:
8h and 3min - Average sunshine in June:
10h and 1min
- Average sunshine in July:
9h and 5min - Average sunshine in August:
9h and 1min - Average sunshine in September:
8h and 2min - Average sunshine in October:
7h and 0min - Average sunshine in November:
5h and 1min - Average sunshine in December:
4h and 2min
The month with the most sunshine is June (Average sunshine: 10h and 12min).
The months with the least sunshine are January and December (Average sunshine: 4h and 18min).
Average sunshine days
Dennison, IL
- Average sunshine days in January:
16.1 days - Average sunshine days in February:
13.4 days - Average sunshine days in March:
13.4 days - Average sunshine days in April:
12.2 days - Average sunshine days in May:
7.9 days - Average sunshine days in June:
10.9 days
- Average sunshine days in July:
10.3 days - Average sunshine days in August:
13.5 days - Average sunshine days in September:
15.7 days - Average sunshine days in October:
17.7 days - Average sunshine days in November:
18.4 days - Average sunshine days in December:
17.2 days
The month with the most sunshine days is November (18.4 days).
The month with the least sunshine days is May (7.9 days).
Average UV index
Dennison, 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, October, November and December (UV index 2).
Average cloud cover
Dennison, 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
Dennison, 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).
Dennison, Illinois, USA
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