Climate and monthly weather forecastHillsboro, IL
Climate and monthly weather forecast
Weather in January
January, like December, in Hillsboro, Illinois, is a wintry winter month, with temperature in the range of an average low of 22.6°F (-5.2°C) and an average high of 35.4°F (1.9°C). January is the coldest month of the year, registering average temperatures as high as 35.4°F (1.9°C) and as low as 22.6°F (-5.2°C). Weather in January »Weather in February
February, the last month of the winter in Hillsboro, is also an icy month, with an average temperature ranging between max 39.7°F (4.3°C) and min 26.4°F (-3.1°C). The initiation of February sees an average high-temperature of a still cold 39.7°F (4.3°C), showing minor variations from the previous month. Weather in February »Weather in March
March, the first month of the spring in Hillsboro, is a cool month, with temperature in the range of an average low of 36.5°F (2.5°C) and an average high of 52.3°F (11.3°C). March's arrival coincides with a temperature rise, moving from February's cold 39.7°F (4.3°C) to a fresh 52.3°F (11.3°C). Weather in March »Weather in April
April in Hillsboro, Illinois, is a refreshing spring month, with an average temperature fluctuating between 46.6°F (8.1°C) and 63.7°F (17.6°C). The average high-temperature increases in April, moving from a cool 52.3°F (11.3°C) in March to a refreshing 63.7°F (17.6°C). Weather in April »Weather in May
May, the last month of the spring in Hillsboro, is a warm month, with temperature in the range of an average high of 73.6°F (23.1°C) and an average low of 56.8°F (13.8°C). With the onset of May, Hillsboro's average high-temperature experiences a rise, moving from April's comfortable 63.7°F (17.6°C) to a moderately hot 73.6°F (23.1°C). Weather in May »Weather in June
June, the first month of the summer in Hillsboro, is still a warm month, with temperature in the range of an average low of 65.5°F (18.6°C) and an average high of 81.9°F (27.7°C). June witnesses a minor rise in the average high-temperature, transitioning from a moderately hot 73.6°F (23.1°C) in May to a still warm 81.9°F (27.7°C). Weather in June »Weather in July
July, the same as June, is a moderately hot summer month in Hillsboro, Illinois, with an average temperature ranging between max 83.8°F (28.8°C) and min 67.1°F (19.5°C). Hillsboro's July weather, marked by an average high temperature of 83.8°F (28.8°C) and an average low temperature of 67.1°F (19.5°C), is the warmest in the year. The heat index value during July is computed to be a torrid 95°F (35°C). Weather in July »Weather in August
August, the last month of the summer in Hillsboro, is another warm month, with an average temperature ranging between max 82.6°F (28.1°C) and min 64.9°F (18.3°C). August's weather displays an average high-temperature of a still moderately hot 82.6°F (28.1°C), slightly varied from July's 83.8°F (28.8°C). Weather in August »Weather in September
September, the first month of the autumn in Hillsboro, is still a warm month, with temperature in the range of an average low of 59.2°F (15.1°C) and an average high of 77.7°F (25.4°C). Hillsboro's September showcases an average high-temperature of a still moderately hot 77.7°F (25.4°C), hardly distinct from August's 82.6°F (28.1°C). Weather in September »Weather in October
October, like September, in Hillsboro, Illinois, is another comfortable autumn month, with an average temperature ranging between min 48.4°F (9.1°C) and max 64.8°F (18.2°C). Hillsboro's progression into October includes a drop in the average high-temperature, from a moderately hot 77.7°F (25.4°C) in September to a refreshing 64.8°F (18.2°C). Weather in October »Weather in November
The last month of the autumn, November, is another cool month in Hillsboro, Illinois, with an average temperature fluctuating between 36.9°F (2.7°C) and 51.4°F (10.8°C). Transition into November marks a drop in the average high-temperature, moving from a comfortable 64.8°F (18.2°C) in October to a fresh 51.4°F (10.8°C). Weather in November »Weather in December
December, the first month of the winter in Hillsboro, is also a wintry month, with temperature in the range of an average high of 40.3°F (4.6°C) and an average low of 28.9°F (-1.7°C). The shift from November to December involves a decrease in the average high-temperature, from a fresh 51.4°F (10.8°C) to an icy 40.3°F (4.6°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
The coldest period in Hillsboro, Illinois, is January, when temperatures fluctuate between an average high of 35.4°F (1.9°C) and a low of 22.6°F (-5.2°C).
In Hillsboro, Illinois, during the entire year, the rain falls for 138.5 days and collects up to 24.33" (618mm) of precipitation.
Months with snowfall in Hillsboro are January through March, November and December.
Throughout the year, in Hillsboro, there are 20.6 snowfall days, and 6.3" (160mm) of snow is accumulated.
The month with the least sunshine is January, with an average of 4.3h of sunshine.
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index.
February is the month with the least rainfall in Hillsboro, Illinois. Rain falls for 7.4 days and accumulates 1.34" (34mm) of precipitation.
The month with the most snowfall in Hillsboro is February, when snow falls for 5.8 days and typically aggregates up to 1.81" (46mm) of snow.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Hillsboro, 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.
In Hillsboro, snow does not fall in April through October.
The month with the most rainfall in Hillsboro is June, when the rain falls for 14.6 days and typically aggregates up to 3.35" (85mm) of precipitation.
With an average of 14h and 54min of daylight, June has the longest days of the year in Hillsboro.
June has the most sunshine of the year in Hillsboro, Illinois, with an average of 10.4h of sunshine.
June through August, with an average maximum UV index of 6, are months with the highest UV index in Hillsboro, Illinois.
With its average high temperature of 83.8°F (28.8°C) and a low of 67.1°F (19.5°C), July is regarded as the warmest month in Hillsboro, Illinois.
With an average relative humidity of 82%, July is the most humid month.
The least humid month in Hillsboro, Illinois, is October, with an average relative humidity of 71%.
The month with the shortest days in Hillsboro, Illinois, is December, with an average of 9h and 30min of daylight.
Average temperature
Hillsboro, IL
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (35.4°F).
The month with the highest average low temperature is July (67.1°F).
The coldest month (with the lowest average low temperature) is January (22.6°F).
Average pressure
Hillsboro, IL
- Average pressure in January:
30.16"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:
30.13"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed
Hillsboro, IL
- Average wind speed in January:
10.3mph - Average wind speed in February:
10.1mph - Average wind speed in March:
9.8mph - Average wind speed in April:
9.9mph - Average wind speed in May:
8.1mph - Average wind speed in June:
7mph
- Average wind speed in July:
5.9mph - Average wind speed in August:
6mph - Average wind speed in September:
6.6mph - Average wind speed in October:
8.7mph - Average wind speed in November:
9.4mph - Average wind speed in December:
9.4mph
The windiest month (with the highest average wind speed) is January (10.3mph).
The calmest month (with the lowest average wind speed) is July (5.9mph).
Average humidity
Hillsboro, IL
The month with the highest relative humidity is July (82%).
The month with the lowest relative humidity is October (71%).
Average rainfall
Hillsboro, IL
- Average rainfall in January:
1.46" - Average rainfall in February:
1.34" - Average rainfall in March:
1.89" - Average rainfall in April:
2.72" - Average rainfall in May:
2.76" - Average rainfall in June:
3.35"
The wettest month (with the highest rainfall) is June (3.35").
The driest month (with the least rainfall) is February (1.34").
Average rainfall days
Hillsboro, IL
- Average rainfall days in January:
7 days - Average rainfall days in February:
7.4 days - Average rainfall days in March:
12.8 days - Average rainfall days in April:
14.8 days - Average rainfall days in May:
16.8 days - Average rainfall days in June:
14.6 days
- Average rainfall days in July:
14.8 days - Average rainfall days in August:
12.3 days - Average rainfall days in September:
11.4 days - Average rainfall days in October:
9.7 days - Average rainfall days in November:
9.1 days - Average rainfall days in December:
7.8 days
The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is January (7 days).
Average snowfall
Hillsboro, IL
The month with the highest snowfall is February (1.81").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days
Hillsboro, IL
- Average snowfall days in January:
6.2 days - Average snowfall days in February:
5.8 days - Average snowfall days in March:
2.4 days - Average snowfall days in April:
0.3 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:
0.1 days - Average snowfall days in November:
1.3 days - Average snowfall days in December:
4.5 days
The month with the highest number of snowfall days is January (6.2 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Hillsboro, IL
- Average daylight in January:
9h and 48min - Average daylight in February:
10h and 48min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 18min - Average daylight in May:
14h and 18min - Average daylight in June:
14h and 54min
- Average daylight in July:
14h and 36min - Average daylight in August:
13h and 42min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 12min - Average daylight in November:
10h and 0min - Average daylight in December:
9h and 30min
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 30min).
- Average sunshine in January:
4h and 18min - Average sunshine in February:
4h and 30min - Average sunshine in March:
6h and 18min - Average sunshine in April:
8h and 12min - Average sunshine in May:
9h and 12min - Average sunshine in June:
10h and 24min
- Average sunshine in July:
10h and 12min - Average sunshine in August:
9h and 48min - Average sunshine in September:
9h and 18min - Average sunshine in October:
6h and 18min - Average sunshine in November:
5h and 30min - Average sunshine in December:
4h and 48min
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 18min).
Average sunshine days
Hillsboro, IL
- Average sunshine days in January:
19.3 days - Average sunshine days in February:
16.2 days - Average sunshine days in March:
16.1 days - Average sunshine days in April:
14 days - Average sunshine days in May:
11.8 days - Average sunshine days in June:
12.3 days
- Average sunshine days in July:
13.5 days - Average sunshine days in August:
15.5 days - Average sunshine days in September:
15.7 days - Average sunshine days in October:
19.8 days - Average sunshine days in November:
19 days - Average sunshine days in December:
19.2 days
The month with the most sunshine days is October (19.8 days).
The month with the least sunshine days is May (11.8 days).
Average UV index
Hillsboro, 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
Hillsboro, IL
The month with the most cloud cover is January (Cloud cover 53).
The months with the least cloud cover are June and September (Cloud cover 29).
Average visibility
Hillsboro, IL
The months with the highest visibility are January, February, March, April, May, June, July, September, October, November and December (6mi).
The month with the lowest visibility is August (5mi).
