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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 Harristown, Illinois, with temperature in the range of an average high of 32.9°F (0.5°C) and an average low of 21.2°F (-6°C). In Harristown, January is the coldest month, with temperatures averaging a high of 32.9°F (0.5°C) and a low of 21.2°F (-6°C). Weather in January »
Weather in February
The last month of the winter, February, is another cold month in Harristown, Illinois, with an average temperature varying between 37.8°F (3.2°C) and 25.2°F (-3.8°C). Harristown measures an average high-temperature of a still cold 37.8°F (3.2°C) in February, nearly consistent with the preceding month. Weather in February »
Weather in March
March, the first month of the spring in Harristown, is a fresh month, with temperature in the range of an average low of 35.6°F (2°C) and an average high of 50.5°F (10.3°C). The shift into March is marked by a rise in the average high-temperature, moving from February's cold 37.8°F (3.2°C) to a fresh 50.5°F (10.3°C). Weather in March »
Weather in April
April is a comfortable spring month in Harristown, Illinois, with an average temperature ranging between min 46°F (7.8°C) and max 61.9°F (16.6°C). The beginning of April signals a rise in the average high-temperature, moving from a fresh 50.5°F (10.3°C) in March to an enjoyable 61.9°F (16.6°C). Weather in April »
Weather in May
May, the last month of the spring in Harristown, is a pleasant month, with an average temperature ranging between max 72.9°F (22.7°C) and min 56.7°F (13.7°C). As April transitions into May, Harristown sees a rise in the average high-temperature, moving from a refreshing 61.9°F (16.6°C) to an agreeable 72.9°F (22.7°C). Weather in May »
Weather in June
June, the first month of the summer in Harristown, is a warm month, with an average temperature fluctuating between 80.6°F (27°C) and 64°F (17.8°C). A soft shift in the average high-temperature is noticeable in June, transitioning from a pleasant 72.9°F (22.7°C) in May to a moderately hot 80.6°F (27°C). Weather in June »
Weather in July
July, like June, in Harristown, Illinois, is a moderately hot summer month, with an average temperature ranging between min 65.7°F (18.7°C) and max 82°F (27.8°C). The month of July sees the highest average temperatures, reaching 82°F (27.8°C) at the peak and 65.7°F (18.7°C) at the low. For most parts of July, the heat index is evaluated at a hot 89.6°F (32°C). Weather in July »
Weather in August
August, the last month of the summer in Harristown, is another warm month, with temperature in the range of an average low of 63.9°F (17.7°C) and an average high of 81.1°F (27.3°C). As Harristown steps into August, the average high-temperature is measured at a still warm 81.1°F (27.3°C), displaying minor differences from July's 82°F (27.8°C). Weather in August »
Weather in September
September, the first month of the autumn in Harristown, is still a warm month, with an average temperature varying between 58.5°F (14.7°C) and 77°F (25°C). The commencement of September brings an average high-temperature of a still warm 77°F (25°C), marking an inconsequential divergence from August. Weather in September »
Weather in October
October, like September, in Harristown, Illinois, is another comfortable autumn month, with an average temperature ranging between max 64°F (17.8°C) and min 48°F (8.9°C). Harristown in October undergoes a mild reduction in the average high-temperature, shifting from September's moderately hot 77°F (25°C) to a refreshing 64°F (17.8°C). Weather in October »
Weather in November
The last month of the autumn, November, is also a frosty month in Harristown, Illinois, with an average temperature varying between 36.1°F (2.3°C) and 49.8°F (9.9°C). November implies a gentle temperature shift, with average high-temperatures reducing from October's enjoyable 64°F (17.8°C) to a chilly 49.8°F (9.9°C). Weather in November »
Weather in December
The first month of the winter, December, is also a wintry month in Harristown, Illinois, with temperature in the range of an average high of 38.5°F (3.6°C) and an average low of 27.9°F (-2.3°C). The arrival of December corresponds with a reduction in the average high-temperature, down from November's chilly 49.8°F (9.9°C) to an icy 38.5°F (3.6°C). Weather in December »
[Resources]Frequently asked questions
What is the coldest time of year in Harristown?
Harristown's coldest month, January, registers temperatures that range from a high of 32.9°F (0.5°C) to a low of 21.2°F (-6°C).
How much does it rain in Harristown?
Throughout the year, there are 130.2 rainfall days, and 16.34" (415mm) of precipitation is accumulated.
When does it snow in Harristown?
January through April, November and December are months with snowfall.
What is the snowiest month in Harristown?
January is the month with the most snowfall. Snow falls for 7.2 days and accumulates 1.85" (47mm) of snow.
How much does it snow in Harristown?
Throughout the year, in Harristown, Illinois, there are 23.1 snowfall days, and 5.67" (144mm) of snow is accumulated.
What is the month with the least sunshine in Harristown?
The month with the least sunshine in Harristown, Illinois, is January, with an average of 4.1h of sunshine.
What are the months with the lowest UV index in Harristown?
The months with the lowest UV index in Harristown, Illinois, are January, February, November and December, with an average maximum UV index of 2.
What is the driest month in Harristown?
February and December are months with the least rain when the rain falls for 5.8 days and typically aggregates up to 0.87" (22mm) of rain.
When is Daylight Saving Time (DST) in Harristown?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Harristown, 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 Harristown?
The month with the most rainfall in Harristown is May, when the rain falls for 17 days and typically aggregates up to 2.01" (51mm) of precipitation.
When it does not snow in Harristown?
May through October are months without snowfall in Harristown, Illinois.
When are the longest days in Harristown?
The month with the longest days in Harristown is June, with an average of 15h and 0min of daylight.
What month has the most sunshine in Harristown?
June has the most sunshine of the year, with an average of 10.4h of sunshine.
What are the months with the highest UV index in Harristown?
The months with the highest UV index in Harristown are June through August, with an average maximum UV index of 6.
What is the hottest time of year in Harristown?
July, marked by an average high-temperature of 82°F (27.8°C) and a low-temperature of 65.7°F (18.7°C), is the warmest month.
What is the most humid month in Harristown?
July is the most humid month in Harristown, Illinois, with an average relative humidity of 84%.
What is the least humid month in Harristown?
With an average relative humidity of 70%, October is the least humid month in Harristown.
What is the month with the shortest days in Harristown?
December has the shortest days of the year, with an average of 9h and 24min of daylight.
Average temperature
Harristown, IL
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (32.9°F).
The month with the highest average low temperature is July (65.7°F).
The coldest month (with the lowest average low temperature) is January (21.2°F).
Average pressure
Harristown, IL
- Average pressure in January:
30.15"Hg - Average pressure in February:
30.12"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:
30.03"Hg - Average pressure in November:
30.12"Hg - Average pressure in December:
30.12"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed
Harristown, IL
- Average wind speed in January:
10.7mph - Average wind speed in February:
10.6mph - Average wind speed in March:
10.3mph - Average wind speed in April:
10.6mph - Average wind speed in May:
8.8mph - Average wind speed in June:
7.5mph
- Average wind speed in July:
6.3mph - Average wind speed in August:
6.3mph - Average wind speed in September:
7.2mph - Average wind speed in October:
9.4mph - Average wind speed in November:
10.1mph - Average wind speed in December:
10.1mph
The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (6.3mph).
Average humidity
Harristown, IL
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (70%).
Average rainfall
Harristown, IL
- Average rainfall in January:
1.06" - Average rainfall in February:
0.87" - Average rainfall in March:
1.3" - Average rainfall in April:
1.93" - Average rainfall in May:
2.01" - Average rainfall in June:
1.93"
- Average rainfall in July:
1.54" - Average rainfall in August:
1.5" - Average rainfall in September:
1.18" - Average rainfall in October:
1.22" - Average rainfall in November:
0.94" - Average rainfall in December:
0.87"
The wettest month (with the highest rainfall) is May (2.01").
The driest months (with the least rainfall) are February and December (0.87").
Average rainfall days
Harristown, IL
- Average rainfall days in January:
6.3 days - Average rainfall days in February:
5.8 days - Average rainfall days in March:
11.6 days - Average rainfall days in April:
13.6 days - Average rainfall days in May:
17 days - Average rainfall days in June:
13.7 days
- Average rainfall days in July:
14.8 days - Average rainfall days in August:
11.8 days - Average rainfall days in September:
10.6 days - Average rainfall days in October:
9.5 days - Average rainfall days in November:
8.4 days - Average rainfall days in December:
7.1 days
The month with the highest number of rainy days is May (17 days).
The month with the least rainy days is February (5.8 days).
Average snowfall
Harristown, IL
The month with the highest snowfall is January (1.85").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days
Harristown, IL
- Average snowfall days in January:
7.2 days - Average snowfall days in February:
5.9 days - Average snowfall days in March:
2.6 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:
1.6 days - Average snowfall days in December:
5.3 days
The month with the highest number of snowfall days is January (7.2 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Harristown, 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:
4h and 1min - Average sunshine in February:
4h and 2min - Average sunshine in March:
6h and 2min - Average sunshine in April:
8h and 1min - Average sunshine in May:
9h and 2min - Average sunshine in June:
10h and 2min
- Average sunshine in July:
10h and 1min - Average sunshine in August:
9h and 5min - Average sunshine in September:
9h and 1min - Average sunshine in October:
6h and 2min - Average sunshine in November:
5h and 2min - Average sunshine in December:
4h and 4min
The month with the most sunshine is June (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days
Harristown, IL
- Average sunshine days in January:
19.5 days - Average sunshine days in February:
16.7 days - Average sunshine days in March:
16.4 days - Average sunshine days in April:
14.5 days - Average sunshine days in May:
11.5 days - Average sunshine days in June:
13 days
- Average sunshine days in July:
13.3 days - Average sunshine days in August:
16.6 days - Average sunshine days in September:
17.3 days - Average sunshine days in October:
19.8 days - Average sunshine days in November:
19.6 days - Average sunshine days in December:
19.4 days
The month with the most sunshine days is October (19.8 days).
The month with the least sunshine days is May (11.5 days).
Average UV index
Harristown, 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
Harristown, IL
The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is September (Cloud cover 29).
Average visibility
Harristown, 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).
Harristown, Illinois, USA
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