Climate and monthly weather forecastHartsville, IL
Climate and monthly weather forecast
Weather in January
January, the same as December, is another cold winter month in Hartsville, Illinois, with temperature in the range of an average low of 26.2°F (-3.2°C) and an average high of 39.7°F (4.3°C). January is the month when Hartsville experiences its coldest temperatures, averaging a high of 39.7°F (4.3°C) and a low of 26.2°F (-3.2°C). Weather in January »Weather in February
February, the last month of the winter in Hartsville, is a frosty month, with an average temperature varying between 30.2°F (-1°C) and 44.1°F (6.7°C). The advent of February observes an average high-temperature of a chilly 44.1°F (6.7°C), nearly identical to January's 39.7°F (4.3°C). Weather in February »Weather in March
The first month of the spring, March, is a cool month in Hartsville, Illinois, with an average temperature fluctuating between 55°F (12.8°C) and 39.2°F (4°C). The start of March brings a shift in the average high-temperature, increasing from February's frosty 44.1°F (6.7°C) to a fresh 55°F (12.8°C). Weather in March »Weather in April
April in Hartsville, Illinois, is an enjoyable spring month, with an average temperature ranging between max 66.4°F (19.1°C) and min 48.7°F (9.3°C). With the beginning of April, Hartsville's average high-temperature sees an increase, transitioning from a cool 55°F (12.8°C) in March to an enjoyable 66.4°F (19.1°C). Weather in April »Weather in May
May, the last month of the spring in Hartsville, is a warm month, with an average temperature fluctuating between 75.6°F (24.2°C) and 58.1°F (14.5°C). May's onset is marked by a temperature increase, moving from a comfortable 66.4°F (19.1°C) in April to a moderately hot 75.6°F (24.2°C). Weather in May »Weather in June
The first month of the summer, June, is also a moderately hot month in Hartsville, Illinois, with an average temperature fluctuating between 84.7°F (29.3°C) and 66.2°F (19°C). The start of June signals an increase in the average high-temperature, moving from 75.6°F (24.2°C) in May to a still warm 84.7°F (29.3°C). Weather in June »Weather in July
July in Hartsville, Illinois, is a tropical summer month, with an average temperature fluctuating between 87.3°F (30.7°C) and 68.5°F (20.3°C). Hartsville experiences its highest average temperatures in July, reaching a peak of 87.3°F (30.7°C) and a minimum of 68.5°F (20.3°C). For most parts of July, the heat index is computed to be a sweltering 102.2°F (39°C). Weather in July »Weather in August
August, the last month of the summer in Hartsville, is another warm month, with an average temperature ranging between max 85.6°F (29.8°C) and min 66°F (18.9°C). August's climate shows a minor adjustment in average high-temperatures to a warm 85.6°F (29.8°C) from July's 87.3°F (30.7°C). Weather in August »Weather in September
September, the first month of the autumn in Hartsville, is still a warm month, with temperature in the range of an average high of 80.4°F (26.9°C) and an average low of 60.4°F (15.8°C). Hartsville in September witnesses an average high-temperature of a still warm 80.4°F (26.9°C), indicating a slight variation from August's 85.6°F (29.8°C). Weather in September »Weather in October
October, like September, in Hartsville, Illinois, is another enjoyable autumn month, with an average temperature varying between 49.3°F (9.6°C) and 67.8°F (19.9°C). The start of October signals a decrease in the average high-temperature, transitioning from a warm 80.4°F (26.9°C) in September to an enjoyable 67.8°F (19.9°C). Weather in October »Weather in November
November, the last month of the autumn in Hartsville, is also a fresh month, with an average temperature varying between 53.8°F (12.1°C) and 38.7°F (3.7°C). Arrival of November comes with a reduction in the average high-temperature, falling from an enjoyable 67.8°F (19.9°C) in October to a fresh 53.8°F (12.1°C). Weather in November »Weather in December
December, the first month of the winter in Hartsville, is still a chilly month, with an average temperature fluctuating between 44.1°F (6.7°C) and 32.4°F (0.2°C). December's onset brings a reduction in the average high-temperature, from a fresh 53.8°F (12.1°C) in November to a frosty 44.1°F (6.7°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
January, having an average high-temperature of 39.7°F (4.3°C) and an average low-temperature of 26.2°F (-3.2°C), is the coldest month in Hartsville, Illinois.
In Hartsville, Illinois, during the entire year, the rain falls for 158.7 days and collects up to 36.1" (917mm) of precipitation.
January through April, November and December are months with snowfall in Hartsville.
The month with the most snowfall in Hartsville is January, when snow falls for 5.3 days and typically aggregates up to 1.73" (44mm) of snow.
Throughout the year, in Hartsville, Illinois, there are 17.5 snowfall days, and 6.5" (165mm) of snow is accumulated.
January, February and December, with an average maximum UV index of 2, are months with the lowest UV index in Hartsville, Illinois.
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.
The month with the most rainfall in Hartsville, Illinois, is April, when the rain falls for 16.6 days and typically aggregates up to 4.8" (122mm) of precipitation.
With an average relative humidity of 79%, May is the most humid month.
In Hartsville, snow does not fall in May through October.
The months with the highest UV index are May through August, with an average maximum UV index of 6.
With an average of 14h and 42min of daylight, June has the longest days of the year in Hartsville.
June has the most sunshine of the year in Hartsville, with an average of 10.6h of sunshine.
July, with average temperatures reaching a high of 87.3°F (30.7°C) and a low of 68.5°F (20.3°C), is the warmest month.
September is the month with the least rainfall. Rain falls for 10.6 days and accumulates 1.61" (41mm) of precipitation.
With an average relative humidity of 70%, October is the least humid month.
The month with the shortest days is December, with an average of 9h and 36min of daylight.
With an average of 4.5h of sunshine, December has the least sunshine of the year in Hartsville, Illinois.
Average temperature
Hartsville, IL
The warmest month (with the highest average high temperature) is July (87.3°F).
The month with the lowest average high temperature is January (39.7°F).
The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (26.2°F).
Average pressure
Hartsville, 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:
29.96"Hg - Average pressure in May:
29.97"Hg - Average pressure in June:
29.94"Hg
- Average pressure in July:
29.98"Hg - Average pressure in August:
29.98"Hg - Average pressure in September:
30.03"Hg - Average pressure in October:
30.04"Hg - Average pressure in November:
30.14"Hg - Average pressure in December:
30.14"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed
Hartsville, IL
- Average wind speed in January:
9.4mph - Average wind speed in February:
9.4mph - Average wind speed in March:
9.3mph - Average wind speed in April:
9.3mph - Average wind speed in May:
7.8mph - Average wind speed in June:
6.6mph
- Average wind speed in July:
5.8mph - Average wind speed in August:
5.8mph - Average wind speed in September:
6.5mph - Average wind speed in October:
8mph - Average wind speed in November:
8.5mph - Average wind speed in December:
8.8mph
The windiest months (with the highest average wind speed) are January and February (9.4mph).
The calmest months (with the lowest average wind speed) are July and August (5.8mph).
Average humidity
Hartsville, IL
The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is October (70%).
Average rainfall
Hartsville, IL
- Average rainfall in January:
2.68" - Average rainfall in February:
2.8" - Average rainfall in March:
3.39" - Average rainfall in April:
4.8" - Average rainfall in May:
3.86" - Average rainfall in June:
3.46"
- Average rainfall in July:
2.87" - Average rainfall in August:
2.52" - Average rainfall in September:
1.61" - Average rainfall in October:
2.68" - Average rainfall in November:
2.64" - Average rainfall in December:
2.8"
The wettest month (with the highest rainfall) is April (4.8").
The driest month (with the least rainfall) is September (1.61").
Average rainfall days
Hartsville, IL
- Average rainfall days in January:
9.8 days - Average rainfall days in February:
10.8 days - Average rainfall days in March:
15.4 days - Average rainfall days in April:
16.6 days - Average rainfall days in May:
18.5 days - Average rainfall days in June:
15.6 days
- Average rainfall days in July:
17.1 days - Average rainfall days in August:
13.8 days - Average rainfall days in September:
10.6 days - Average rainfall days in October:
10.5 days - Average rainfall days in November:
9.7 days - Average rainfall days in December:
10.3 days
The month with the highest number of rainy days is May (18.5 days).
The month with the least rainy days is November (9.7 days).
Average snowfall
Hartsville, IL
The month with the highest snowfall is January (1.73").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days
Hartsville, IL
- Average snowfall days in January:
5.3 days - Average snowfall days in February:
5.1 days - Average snowfall days in March:
1.8 days - Average snowfall days in April:
0.6 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:
1.2 days - Average snowfall days in December:
3.5 days
The month with the highest number of snowfall days is January (5.3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Hartsville, IL
- Average daylight in January:
9h and 54min - Average daylight in February:
10h and 48min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 12min - Average daylight in May:
14h and 12min - Average daylight in June:
14h and 42min
- Average daylight in July:
14h and 30min - Average daylight in August:
13h and 36min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 12min - Average daylight in November:
10h and 12min - Average daylight in December:
9h and 36min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in January:
4h and 36min - Average sunshine in February:
4h and 42min - Average sunshine in March:
6h and 18min - Average sunshine in April:
8h and 36min - Average sunshine in May:
9h and 12min - Average sunshine in June:
10h and 36min
- Average sunshine in July:
10h and 30min - Average sunshine in August:
10h and 18min - Average sunshine in September:
9h and 12min - Average sunshine in October:
6h and 42min - Average sunshine in November:
5h and 30min - Average sunshine in December:
4h and 30min
The month with the most sunshine is June (Average sunshine: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 4h and 30min).
Average sunshine days
Hartsville, IL
- Average sunshine days in January:
16.2 days - Average sunshine days in February:
13.1 days - Average sunshine days in March:
12.6 days - Average sunshine days in April:
11.5 days - Average sunshine days in May:
9.9 days - Average sunshine days in June:
12.1 days
- Average sunshine days in July:
12.2 days - Average sunshine days in August:
15 days - Average sunshine days in September:
17.3 days - Average sunshine days in October:
19.5 days - Average sunshine days in November:
17.7 days - Average sunshine days in December:
17 days
The month with the most sunshine days is October (19.5 days).
The month with the least sunshine days is May (9.9 days).
Average UV index
Hartsville, IL
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February and December (UV index 2).
Average cloud cover
Hartsville, IL
The months with the most cloud cover are January and February (Cloud cover 51).
The month with the least cloud cover is June (Cloud cover 28).
Average visibility
Hartsville, IL
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
