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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, like December, is a freezing cold winter month in Henderson, Illinois, with an average temperature ranging between min 17.4°F (-8.1°C) and max 29.5°F (-1.4°C). The coldest period is January, when temperatures fluctuate between an average high of 29.5°F (-1.4°C) and a low of 17.4°F (-8.1°C). Weather in January »
Weather in February
The last month of the winter, February, is a wintry month in Henderson, Illinois, with an average temperature fluctuating between 21.2°F (-6°C) and 34.7°F (1.5°C). February brings a marginal elevation to a wintry 34.7°F (1.5°C) from January's 29.5°F (-1.4°C) in Henderson's average high-temperatures. Weather in February »
Weather in March
March, the first month of the spring in Henderson, is a chilly month, with an average temperature varying between 32.9°F (0.5°C) and 48°F (8.9°C). The start of March brings a rise in the average high-temperature, moving from a cold 34.7°F (1.5°C) in February to a chilly 48°F (8.9°C). Weather in March »
Weather in April
April is a refreshing spring month in Henderson, Illinois, with an average temperature varying between 43.2°F (6.2°C) and 59.9°F (15.5°C). April brings a rise in Henderson's average high-temperature, moving from a chilly 48°F (8.9°C) in March to a refreshing 59.9°F (15.5°C). Weather in April »
Weather in May
The last month of the spring, May, is an agreeable month in Henderson, Illinois, with an average temperature fluctuating between 54°F (12.2°C) and 70.7°F (21.5°C). As April transitions into May, Henderson sees a rise in the average high-temperature, moving from a refreshing 59.9°F (15.5°C) to an agreeable 70.7°F (21.5°C). Weather in May »
Weather in June
June, the first month of the summer in Henderson, is a warm month, with an average temperature varying between 62.4°F (16.9°C) and 79.2°F (26.2°C). June witnesses a minor rise in the average high-temperature, transitioning from an agreeable 70.7°F (21.5°C) in May to a warm 79.2°F (26.2°C). Weather in June »
Weather in July
July, like June, in Henderson, Illinois, is a moderately hot summer month, with temperature in the range of an average low of 64.9°F (18.3°C) and an average high of 81.1°F (27.3°C). July, known for its average high temperature of 81.1°F (27.3°C) and an average low temperature of 64.9°F (18.3°C), is the warmest month. For most parts of July, the heat index is computed to be a hot 87.8°F (31°C). Weather in July »
Weather in August
The last month of the summer, August, is another warm month in Henderson, Illinois, with an average temperature ranging between max 80.6°F (27°C) and min 63.3°F (17.4°C). August records an average high-temperature of a still moderately hot 80.6°F (27°C), indicating a minor variation from the preceding month. Weather in August »
Weather in September
September, the first month of the autumn in Henderson, is also a moderately hot month, with an average temperature fluctuating between 75.6°F (24.2°C) and 56.3°F (13.5°C). Henderson's weather in September displays an average high-temperature of a still moderately hot 75.6°F (24.2°C), showing minor disparity from August's 80.6°F (27°C). Weather in September »
Weather in October
October, the same as September, is another refreshing autumn month in Henderson, Illinois, with an average temperature ranging between max 61.5°F (16.4°C) and min 45.7°F (7.6°C). October comes with a drop in the average high-temperature, falling from September's moderately hot 75.6°F (24.2°C) to a comfortable 61.5°F (16.4°C). Weather in October »
Weather in November
The last month of the autumn, November, is also a frosty month in Henderson, Illinois, with an average temperature varying between 47.5°F (8.6°C) and 33.8°F (1°C). Setting in of November comes with a decrease in the average high-temperature, moving from a refreshing 61.5°F (16.4°C) in October to a chilly 47.5°F (8.6°C). Weather in November »
Weather in December
The first month of the winter, December, is also an icy month in Henderson, Illinois, with an average temperature varying between 24.6°F (-4.1°C) and 35.4°F (1.9°C). Observing a mild shift, the average high-temperature during December reduces from November's chilly 47.5°F (8.6°C) to a wintry 35.4°F (1.9°C). Weather in December »
Updated: Aug 23, 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?
With average high temperatures of 29.5°F (-1.4°C) and lows of 17.4°F (-8.1°C), January is the coldest month.
What is the driest month?
January and December are months with the least rain when the rain falls for 4 days and typically aggregates up to 0.47" (12mm) of rain.
How much does it rain?
In Henderson, during the entire year, the rain falls for 109.9 days and collects up to 11.14" (283mm) of precipitation.
When does it snow?
January through April, October through December are months with snowfall.
What is the snowiest month?
The month with the most snowfall is January, when snow falls for 8.8 days and typically aggregates up to 1.38" (35mm) of snow.
How much does it snow?
In Henderson, during the entire year, snow falls for 28 days and aggregates up to 4.53" (115mm) of snow.
What is the month with the least sunshine?
The month with the least sunshine is January, with an average of 4h of sunshine.
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 in Henderson?
The month with the most rainfall is May, when the rain falls for 15.2 days and typically aggregates up to 1.65" (42mm) of precipitation.
When it does not snow?
In Henderson, snow does not fall in May through September.
When are the longest days in Henderson?
The month with the longest days is June, with an average of 15h and 6min of daylight.
What month has the most sunshine?
June has the most sunshine of the year, with an average of 10.1h of sunshine.
What is the month with the highest UV index?
The months with the highest UV index are June and July, with an average maximum UV index of 6.
What month is the hottest?
Henderson's temperature records reveal July as the warmest month, marked by average highs of 81.1°F (27.3°C) and lows of 64.9°F (18.3°C).
What is the most humid month?
With an average relative humidity of 84%, July is the most humid month.
What is the least humid month in Henderson?
The least humid month is October, with an average relative humidity of 72%.
What is the month with the shortest days?
December has the shortest days of the year, with an average of 9h and 18min of daylight.
What is the month with the lowest UV index?
December is the month with the lowest UV index, with an average maximum UV index of 1.
Average temperature
Henderson, IL
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (29.5°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 (17.4°F).
Average pressure
Henderson, IL
- Average pressure in January:
30.14"Hg - Average pressure in February:
30.12"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.93"Hg - Average pressure in May:
29.95"Hg - Average pressure in June:
29.91"Hg
- Average pressure in July:
29.96"Hg - Average pressure in August:
29.97"Hg - Average pressure in September:
30.02"Hg - Average pressure in October:
30.01"Hg - Average pressure in November:
30.1"Hg - Average pressure in December:
30.11"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed
Henderson, IL
- Average wind speed in January:
10.6mph - Average wind speed in February:
10.6mph - Average wind speed in March:
10.6mph - Average wind speed in April:
10.8mph - Average wind speed in May:
9.1mph - Average wind speed in June:
8mph
- Average wind speed in July:
6.8mph - Average wind speed in August:
6.8mph - Average wind speed in September:
7.9mph - Average wind speed in October:
9.5mph - Average wind speed in November:
10.3mph - Average wind speed in December:
9.9mph
The windiest month (with the highest average wind speed) is April (10.8mph).
The calmest months (with the lowest average wind speed) are July and August (6.8mph).
Average humidity
Henderson, IL
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (72%).
Average rainfall
Henderson, IL
- Average rainfall in January:
0.47" - Average rainfall in February:
0.59" - Average rainfall in March:
0.75" - Average rainfall in April:
1.3" - Average rainfall in May:
1.65" - Average rainfall in June:
1.34"
- Average rainfall in July:
1.14" - Average rainfall in August:
0.83" - Average rainfall in September:
1.02" - Average rainfall in October:
0.98" - Average rainfall in November:
0.59" - Average rainfall in December:
0.47"
The wettest month (with the highest rainfall) is May (1.65").
The driest months (with the least rainfall) are January and December (0.47").
Average rainfall days
Henderson, IL
- Average rainfall days in January:
4 days - Average rainfall days in February:
3.9 days - Average rainfall days in March:
9.3 days - Average rainfall days in April:
11.8 days - Average rainfall days in May:
15.2 days - Average rainfall days in June:
14.5 days
- Average rainfall days in July:
12.8 days - Average rainfall days in August:
10.1 days - Average rainfall days in September:
8.7 days - Average rainfall days in October:
8.8 days - Average rainfall days in November:
6.3 days - Average rainfall days in December:
4.5 days
The month with the highest number of rainy days is May (15.2 days).
The month with the least rainy days is February (3.9 days).
Average snowfall
Henderson, IL
The month with the highest snowfall is January (1.38").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Henderson, IL
- Average snowfall days in January:
8.8 days - Average snowfall days in February:
6.8 days - Average snowfall days in March:
3.2 days - Average snowfall days in April:
0.9 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:
0.3 days - Average snowfall days in November:
2 days - Average snowfall days in December:
6 days
The month with the highest number of snowfall days is January (8.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Henderson, 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 3min - 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 2min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in January:
4h and 0min - Average sunshine in February:
4h and 1min - Average sunshine in March:
6h and 2min - Average sunshine in April:
7h and 5min - Average sunshine in May:
8h and 4min - Average sunshine in June:
10h and 1min
- Average sunshine in July:
10h and 0min - Average sunshine in August:
9h and 5min - Average sunshine in September:
9h and 1min - Average sunshine in October:
5h and 4min - 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: 4h and 0min).
Average sunshine days
Henderson, IL
- Average sunshine days in January:
20 days - Average sunshine days in February:
18.9 days - Average sunshine days in March:
17.5 days - Average sunshine days in April:
16.3 days - Average sunshine days in May:
13.7 days - Average sunshine days in June:
12.4 days
- Average sunshine days in July:
13.2 days - Average sunshine days in August:
16.8 days - Average sunshine days in September:
18.4 days - Average sunshine days in October:
19.9 days - Average sunshine days in November:
20.5 days - Average sunshine days in December:
21.6 days
The month with the most sunshine days is December (21.6 days).
The month with the least sunshine days is June (12.4 days).
Average UV index
Henderson, IL
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover
Henderson, IL
The month with the most cloud cover is January (Cloud cover 58).
The month with the least cloud cover is September (Cloud cover 30).
Average visibility
Henderson, IL
The months with the highest visibility are January, February, March, April, May, June, August, September, October, November and December (6mi).
The month with the lowest visibility is July (5mi).
Henderson, Illinois, USA
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