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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 Harmon, Illinois, with temperature in the range of an average high of 27.7°F (-2.4°C) and an average low of 14.9°F (-9.5°C). January is the month when Harmon sees the lowest average temperatures, with a high of 27.7°F (-2.4°C) and a low of 14.9°F (-9.5°C). Weather in January »
Weather in February
The last month of the winter, February, is also a subzero cold month in Harmon, Illinois, with temperature in the range of an average high of 31.6°F (-0.2°C) and an average low of 18.5°F (-7.5°C). The shift to February signals an average high-temperature of a still freezing cold 31.6°F (-0.2°C), subtly varied from January's 27.7°F (-2.4°C). Weather in February »
Weather in March
The first month of the spring, March, is a frosty month in Harmon, Illinois, with an average temperature varying between 31.3°F (-0.4°C) and 45.9°F (7.7°C). As February transitions into March, Harmon sees a rise in the average high-temperature, moving from a freezing cold 31.6°F (-0.2°C) to a frosty 45.9°F (7.7°C). Weather in March »
Weather in April
April is a refreshing spring month in Harmon, Illinois, with an average temperature fluctuating between 41.4°F (5.2°C) and 57.9°F (14.4°C). With the onset of April, the average high-temperature slightly shifts from March's frosty 45.9°F (7.7°C) to a mild 57.9°F (14.4°C). Weather in April »
Weather in May
The last month of the spring, May, is a pleasant month in Harmon, Illinois, with an average temperature fluctuating between 69.4°F (20.8°C) and 52.5°F (11.4°C). As April transitions into May, a change in temperatures is observed, with average highs moving from a mild 57.9°F (14.4°C) to a pleasant 69.4°F (20.8°C). Weather in May »
Weather in June
The first month of the summer, June, is a moderately hot month in Harmon, Illinois, with an average temperature varying between 78.3°F (25.7°C) and 61.3°F (16.3°C). The start of June brings a subtle shift in the average high-temperature, edging up from May's pleasant 69.4°F (20.8°C) to a warm 78.3°F (25.7°C). Weather in June »
Weather in July
July, like June, in Harmon, Illinois, is a moderately hot summer month, with an average temperature varying between 80.2°F (26.8°C) and 63.9°F (17.7°C). In Harmon, Illinois, the peak temperatures are generally noted in July, averaging a high of 80.2°F (26.8°C) and a low of 63.9°F (17.7°C). Weather in July »
Weather in August
August, the last month of the summer in Harmon, is also a moderately hot month, with an average temperature ranging between max 79.3°F (26.3°C) and min 61.7°F (16.5°C). Harmon experiences a minor change to a still warm 79.3°F (26.3°C) in average high-temperature during August, closely reflecting July. Weather in August »
Weather in September
September, the first month of the autumn in Harmon, is also a moderately hot month, with temperature in the range of an average low of 55.2°F (12.9°C) and an average high of 73.9°F (23.3°C). As August makes way for September, Harmon's average high-temperature eases from 79.3°F (26.3°C) to a still moderately hot 73.9°F (23.3°C). Weather in September »
Weather in October
October, like September, is another refreshing autumn month in Harmon, Illinois, with temperature in the range of an average high of 60.6°F (15.9°C) and an average low of 44.6°F (7°C). During the transition into October, Harmon observes a decrease in the average high-temperature, falling from a moderately hot 73.9°F (23.3°C) in September to a refreshing 60.6°F (15.9°C). Weather in October »
Weather in November
The last month of the autumn, November, is also a frosty month in Harmon, Illinois, with an average temperature varying between 32.4°F (0.2°C) and 45.5°F (7.5°C). The start of November brings a distinct shift in the average high-temperature, dropping from October's moderate 60.6°F (15.9°C) to a frosty 45.5°F (7.5°C). Weather in November »
Weather in December
December, the first month of the winter in Harmon, is also a wintry month, with temperature in the range of an average high of 33.8°F (1°C) and an average low of 23.2°F (-4.9°C). The shift from November to December corresponds with a decrease in the average high-temperature, down to an icy 33.8°F (1°C) from a chilly 45.5°F (7.5°C). 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
What are the coldest months in Harmon?
January, having an average high-temperature of 27.7°F (-2.4°C) and an average low-temperature of 14.9°F (-9.5°C), is the coldest month.
What are the most humid months in Harmon?
January and July, with an average relative humidity of 85%, are most humid months in Harmon, Illinois.
What is the driest month in Harmon?
The months with the least rainfall are January and February Rain falls for 4.8 days and accumulates 0.75" (19mm) of rain.
How much does it rain in Harmon?
In Harmon, during the entire year, the rain falls for 130.2 days and collects up to 17.36" (441mm) of precipitation.
When does it snow in Harmon?
January through April, October through December are months with snowfall.
What is the snowiest month in Harmon?
January is the month with the most snowfall in Harmon. Snow falls for 10.2 days and accumulates 2.56" (65mm) of snow.
How many days does it snow in Harmon?
In Harmon, during the entire year, snow falls for 34.2 days and aggregates up to 7.87" (200mm) of snow.
What is the month with the least sunshine in Harmon?
With an average of 3.8h of sunshine, January has the least sunshine of the year in Harmon, Illinois.
When is Daylight Saving Time (DST) in Harmon?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Harmon, 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 Harmon?
May is the month with the most rainfall in Harmon, Illinois. Rain falls for 17.3 days and accumulates 2.83" (72mm) of precipitation.
When it does not snow in Harmon?
May through September are months without snowfall.
When are the longest days in Harmon?
The month with the longest days is June, with an average of 15h and 12min of daylight.
What part of the year is the hottest in Harmon?
With average high temperatures of 80.2°F (26.8°C) and lows of 63.9°F (17.7°C), July is the warmest month in Harmon.
What month has the most sunshine in Harmon?
With an average of 9.8h of sunshine, July has the most sunshine of the year.
What is the month with the highest UV index in Harmon?
With an average maximum UV index of 6, July is the month with the highest UV index.
What is the least humid month in Harmon?
The least humid month is October, with an average relative humidity of 73%.
What is the month with the shortest days in Harmon?
December has the shortest days of the year, with an average of 9h and 12min of daylight.
When is the lowest UV index in Harmon?
With an average maximum UV index of 1, December is the month with the lowest UV index in Harmon, Illinois.
Average temperature
Harmon, 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 (27.7°F).
The month with the highest average low temperature is July (63.9°F).
The coldest month (with the lowest average low temperature) is January (14.9°F).
Average pressure
Harmon, IL
- Average pressure in January:
30.12"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:
29.95"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:
30.03"Hg - Average pressure in October:
30.01"Hg - Average pressure in November:
30.09"Hg - Average pressure in December:
30.1"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed
Harmon, 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:
10.4mph - Average wind speed in May:
8.8mph - Average wind speed in June:
7.6mph
- Average wind speed in July:
6.5mph - Average wind speed in August:
6.4mph - Average wind speed in September:
7.6mph - Average wind speed in October:
9.1mph - Average wind speed in November:
9.9mph - Average wind speed in December:
9.5mph
The windiest month (with the highest average wind speed) is April (10.4mph).
The calmest month (with the lowest average wind speed) is August (6.4mph).
Average humidity
Harmon, IL
The months with the highest relative humidity are January and July (85%).
The month with the lowest relative humidity is October (73%).
Average rainfall
Harmon, IL
- Average rainfall in January:
0.75" - Average rainfall in February:
0.75" - Average rainfall in March:
1.1" - Average rainfall in April:
1.89" - Average rainfall in May:
2.83" - Average rainfall in June:
2.13"
- Average rainfall in July:
1.81" - Average rainfall in August:
1.34" - Average rainfall in September:
1.26" - Average rainfall in October:
1.65" - Average rainfall in November:
1.02" - Average rainfall in December:
0.83"
The wettest month (with the highest rainfall) is May (2.83").
The driest months (with the least rainfall) are January and February (0.75").
Average rainfall days
Harmon, IL
- Average rainfall days in January:
4.8 days - Average rainfall days in February:
5 days - Average rainfall days in March:
11.1 days - Average rainfall days in April:
14.8 days - Average rainfall days in May:
17.3 days - Average rainfall days in June:
16.5 days
- Average rainfall days in July:
14.1 days - Average rainfall days in August:
12.5 days - Average rainfall days in September:
9.7 days - Average rainfall days in October:
10.8 days - Average rainfall days in November:
7.9 days - Average rainfall days in December:
5.7 days
The month with the highest number of rainy days is May (17.3 days).
The month with the least rainy days is January (4.8 days).
Average snowfall
Harmon, IL
The month with the highest snowfall is January (2.56").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Harmon, IL
- Average snowfall days in January:
10.2 days - Average snowfall days in February:
8.2 days - Average snowfall days in March:
4.4 days - Average snowfall days in April:
1 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:
0.5 days - Average snowfall days in November:
2.5 days - Average snowfall days in December:
7.4 days
The month with the highest number of snowfall days is January (10.2 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Harmon, 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 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 5min - Average sunshine in February:
4h and 0min - Average sunshine in March:
6h and 2min - Average sunshine in April:
7h and 4min - Average sunshine in May:
8h and 4min - Average sunshine in June:
9h and 4min
- Average sunshine in July:
9h and 5min - Average sunshine in August:
9h and 4min - Average sunshine in September:
9h and 1min - Average sunshine in October:
5h and 3min - Average sunshine in November:
5h and 1min - Average sunshine in December:
4h and 1min
The month with the most sunshine is July (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days
Harmon, IL
- Average sunshine days in January:
17 days - Average sunshine days in February:
16.2 days - Average sunshine days in March:
16.7 days - Average sunshine days in April:
13.1 days - Average sunshine days in May:
11.4 days - Average sunshine days in June:
11.3 days
- Average sunshine days in July:
12.7 days - Average sunshine days in August:
15.8 days - Average sunshine days in September:
18.4 days - Average sunshine days in October:
18.6 days - Average sunshine days in November:
18.8 days - Average sunshine days in December:
18.8 days
The months with the most sunshine days are November and December (18.8 days).
The month with the least sunshine days is June (11.3 days).
Average UV index
Harmon, IL
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover
Harmon, IL
The month with the most cloud cover is January (Cloud cover 60).
The month with the least cloud cover is September (Cloud cover 31).
Average visibility
Harmon, 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).
Harmon, Illinois, USA
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