Climate and monthly weather forecastHartsburg, IL
Climate and monthly weather forecast
Weather in January
January, like December, in Hartsburg, Illinois, is an icy winter month, with an average temperature varying between 32.2°F (0.1°C) and 19.9°F (-6.7°C). Hartsburg records the coldest temperatures in January, averaging a high of 32.2°F (0.1°C) and a low of 19.9°F (-6.7°C). Weather in January »Weather in February
The last month of the winter, February, is also an icy month in Hartsburg, Illinois, with an average temperature ranging between min 23.9°F (-4.5°C) and max 37.2°F (2.9°C). Hartsburg transitions into February recording an average high-temperature of a still cold 37.2°F (2.9°C), closely aligning with the preceding month's temperature. Weather in February »Weather in March
The first month of the spring, March, is a frosty month in Hartsburg, Illinois, with an average temperature ranging between max 49.8°F (9.9°C) and min 35.2°F (1.8°C). The shift from February to March brings an increase in the average high-temperature, moving from an icy 37.2°F (2.9°C) to a frosty 49.8°F (9.9°C). Weather in March »Weather in April
April is an enjoyable spring month in Hartsburg, Illinois, with temperature in the range of an average low of 45.5°F (7.5°C) and an average high of 61.7°F (16.5°C). Hartsburg sees an increase in average high-temperatures during April, moving from a frosty 49.8°F (9.9°C) in March to a comfortable 61.7°F (16.5°C). Weather in April »Weather in May
May, the last month of the spring in Hartsburg, is an agreeable month, with temperature in the range of an average low of 55.9°F (13.3°C) and an average high of 72.7°F (22.6°C). May's onset brings a temperature rise, moving from a refreshing 61.7°F (16.5°C) in April to a pleasant 72.7°F (22.6°C). Weather in May »Weather in June
June, the first month of the summer in Hartsburg, is a warm month, with an average temperature fluctuating between 80.6°F (27°C) and 63.9°F (17.7°C). As Hartsburg transitions into June, a marginal rise in the average high-temperature is observed, moving from an agreeable 72.7°F (22.6°C) in May to a warm 80.6°F (27°C). Weather in June »Weather in July
July, the same as June, is another warm summer month in Hartsburg, Illinois, with an average temperature varying between 82°F (27.8°C) and 65.5°F (18.6°C). July, recording an average high temperature of 82°F (27.8°C) and a low temperature of 65.5°F (18.6°C), is Hartsburg's warmest month. For most parts of July, the heat index is computed to be a tropical 89.6°F (32°C). Weather in July »Weather in August
The last month of the summer, August, is also a moderately hot month in Hartsburg, Illinois, with an average temperature varying between 81.3°F (27.4°C) and 63.9°F (17.7°C). Hartsburg marks the onset of August with an average high-temperature of a still warm 81.3°F (27.4°C), a subtle shift from July's 82°F (27.8°C). Weather in August »Weather in September
September, the first month of the autumn in Hartsburg, is also a moderately hot month, with an average temperature ranging between max 76.6°F (24.8°C) and min 58.3°F (14.6°C). Hartsburg measures an average high-temperature of a still warm 76.6°F (24.8°C) in September, nearly consistent with the preceding month. Weather in September »Weather in October
October, like September, in Hartsburg, Illinois, is another refreshing autumn month, with temperature in the range of an average high of 63.7°F (17.6°C) and an average low of 47.3°F (8.5°C). Onset of October comes with a temperature decline, the average high falling from a warm 76.6°F (24.8°C) in September to a refreshing 63.7°F (17.6°C). Weather in October »Weather in November
November, the last month of the autumn in Hartsburg, is also a frosty month, with an average temperature ranging between max 49.6°F (9.8°C) and min 35.6°F (2°C). The onset of November coincides with a reduction in the average high-temperature, falling from a refreshing 63.7°F (17.6°C) in October to a chilly 49.6°F (9.8°C). Weather in November »Weather in December
December, the first month of the winter in Hartsburg, is still a cold month, with an average temperature fluctuating between 27.3°F (-2.6°C) and 38.3°F (3.5°C). The onset of December coincides with a reduction in the average high-temperature, falling from a chilly 49.6°F (9.8°C) in November to a wintry 38.3°F (3.5°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
The coldest period in Hartsburg is January, when temperatures fluctuate between an average high of 32.2°F (0.1°C) and a low of 19.9°F (-6.7°C).
In Hartsburg, Illinois, during the entire year, the rain falls for 135 days and collects up to 20.28" (515mm) of precipitation.
January through April, November and December are months with snowfall in Hartsburg, Illinois.
The month with the most snowfall in Hartsburg is January, when snow falls for 8.2 days and typically aggregates up to 2.76" (70mm) of snow.
Throughout the year, there are 24.9 snowfall days, and 7.64" (194mm) of snow is accumulated.
The month with the least sunshine is January, with an average of 4h of sunshine.
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Hartsburg.
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.
May is the month with the most rainfall in Hartsburg, Illinois. Rain falls for 18 days and accumulates 2.76" (70mm) of precipitation.
May through October are months without snowfall.
With an average of 15h and 0min of daylight, June has the longest days of the year.
The month with the most sunshine is June, with an average of 10.3h of sunshine.
The months with the highest UV index in Hartsburg are June through August, with an average maximum UV index of 6.
Hartsburg, Illinois, reaches its average highest temperatures in July, measuring 82°F (27.8°C) at the peak and 65.5°F (18.6°C) at the lowest.
July is the most humid month in Hartsburg, with an average relative humidity of 84%.
With an average relative humidity of 70%, October is the least humid month in Hartsburg.
The month with the least rainfall is December, when the rain falls for 6.7 days and typically collects 1.02" (26mm) of precipitation.
The month with the shortest days in Hartsburg, Illinois, is December, with an average of 9h and 24min of daylight.
Average temperature
Hartsburg, IL
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (32.2°F).
The month with the highest average low temperature is July (65.5°F).
The coldest month (with the lowest average low temperature) is January (19.9°F).
Average pressure
Hartsburg, 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:
29.94"Hg - Average pressure in May:
29.95"Hg - Average pressure in June:
29.91"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:
30.02"Hg - Average pressure in November:
30.11"Hg - Average pressure in December:
30.12"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
Hartsburg, IL
- Average wind speed in January:
10.3mph - Average wind speed in February:
10.3mph - 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:
7.6mph
- Average wind speed in July:
6.3mph - Average wind speed in August:
6.3mph - Average wind speed in September:
7.3mph - Average wind speed in October:
9mph - Average wind speed in November:
9.8mph - Average wind speed in December:
9.7mph
The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest months (with the lowest average wind speed) are July and August (6.3mph).
Average humidity
Hartsburg, IL
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (70%).
Average rainfall
Hartsburg, IL
- Average rainfall in January:
1.1" - Average rainfall in February:
1.1" - Average rainfall in March:
1.54" - Average rainfall in April:
2.13" - Average rainfall in May:
2.76" - Average rainfall in June:
2.4"
- Average rainfall in July:
1.89" - Average rainfall in August:
1.73" - Average rainfall in September:
1.69" - Average rainfall in October:
1.57" - Average rainfall in November:
1.34" - Average rainfall in December:
1.02"
The wettest month (with the highest rainfall) is May (2.76").
The driest month (with the least rainfall) is December (1.02").
Average rainfall days
Hartsburg, IL
- Average rainfall days in January:
6.3 days - Average rainfall days in February:
5.4 days - Average rainfall days in March:
12.8 days - Average rainfall days in April:
13.8 days - Average rainfall days in May:
18 days - Average rainfall days in June:
15.5 days
- Average rainfall days in July:
15.2 days - Average rainfall days in August:
12.2 days - Average rainfall days in September:
10.7 days - Average rainfall days in October:
10.4 days - Average rainfall days in November:
8 days - Average rainfall days in December:
6.7 days
The month with the highest number of rainy days is May (18 days).
The month with the least rainy days is February (5.4 days).
Average snowfall
Hartsburg, IL
The month with the highest snowfall is January (2.76").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days
Hartsburg, IL
- Average snowfall days in January:
8.2 days - Average snowfall days in February:
5.8 days - Average snowfall days in March:
2.8 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:
0.2 days - Average snowfall days in November:
1.8 days - Average snowfall days in December:
5.6 days
The month with the highest number of snowfall days is January (8.2 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Hartsburg, IL
- Average daylight in January:
9h and 42min - Average daylight in February:
10h and 42min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 18min - Average daylight in May:
14h and 24min - Average daylight in June:
15h and 0min
- Average daylight in July:
14h and 42min - Average daylight in August:
13h and 42min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 6min - Average daylight in November:
10h and 0min - Average daylight in December:
9h and 24min
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 0min - Average sunshine in February:
4h and 24min - Average sunshine in March:
6h and 30min - Average sunshine in April:
8h and 6min - Average sunshine in May:
9h and 18min - Average sunshine in June:
10h and 18min
- Average sunshine in July:
10h and 0min - Average sunshine in August:
9h and 54min - Average sunshine in September:
9h and 12min - Average sunshine in October:
6h and 0min - Average sunshine in November:
5h and 18min - Average sunshine in December:
4h and 30min
The month with the most sunshine is June (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days
Hartsburg, IL
- Average sunshine days in January:
18.9 days - Average sunshine days in February:
17.6 days - Average sunshine days in March:
16.1 days - Average sunshine days in April:
14.5 days - Average sunshine days in May:
10.8 days - Average sunshine days in June:
12.3 days
- Average sunshine days in July:
12.2 days - Average sunshine days in August:
15 days - Average sunshine days in September:
18.2 days - Average sunshine days in October:
19 days - Average sunshine days in November:
20.4 days - Average sunshine days in December:
19.2 days
The month with the most sunshine days is November (20.4 days).
The month with the least sunshine days is May (10.8 days).
Average UV index
Hartsburg, 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
Hartsburg, IL
The month with the most cloud cover is January (Cloud cover 56).
The months with the least cloud cover are August and September (Cloud cover 30).
Average visibility
Hartsburg, 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).
