Climate and monthly weather forecastHerrin, IL
Climate and monthly weather forecast
Weather in January
January, like December, in Herrin, Illinois, is an icy winter month, with an average temperature ranging between min 26.1°F (-3.3°C) and max 39.6°F (4.2°C). The coldest time of the year is January, with temperatures averaging a high of 39.6°F (4.2°C) and a low of 26.1°F (-3.3°C). Weather in January »Weather in February
The last month of the winter, February, is a chilly month in Herrin, Illinois, with an average temperature ranging between max 43.7°F (6.5°C) and min 29.8°F (-1.2°C). February welcomes an average high-temperature of a frosty 43.7°F (6.5°C), not much different from the preceding month. Weather in February »Weather in March
The first month of the spring, March, is a cool month in Herrin, Illinois, with an average temperature fluctuating between 38.8°F (3.8°C) and 55.2°F (12.9°C). Herrin in March shows a temperature shift, moving from an average high of a frosty 43.7°F (6.5°C) in February to a fresh 55.2°F (12.9°C). Weather in March »Weather in April
April is a refreshing spring month in Herrin, Illinois, with an average temperature varying between 66.4°F (19.1°C) and 48.7°F (9.3°C). The beginning of April signals a rise in the average high-temperature, moving from a fresh 55.2°F (12.9°C) in March to a comfortable 66.4°F (19.1°C). Weather in April »Weather in May
May, the last month of the spring in Herrin, is a moderately hot month, with temperature in the range of an average high of 75.4°F (24.1°C) and an average low of 58.1°F (14.5°C). May's onset brings a rise in the average high-temperature, moving from an enjoyable 66.4°F (19.1°C) in April to a warm 75.4°F (24.1°C). Weather in May »Weather in June
June, the first month of the summer in Herrin, is also a moderately hot month, with an average temperature fluctuating between 66.4°F (19.1°C) and 84.7°F (29.3°C). As Herrin, Illinois, welcomes June, the average high-temperature sees a rise, transitioning from 75.4°F (24.1°C) in May to a still moderately hot 84.7°F (29.3°C). Weather in June »Weather in July
July in Herrin, Illinois, is a hot summer month, with temperature in the range of an average high of 87.4°F (30.8°C) and an average low of 68.5°F (20.3°C). July is the month when Herrin sees the highest average temperatures, with a high of 87.4°F (30.8°C) and a low of 68.5°F (20.3°C). July's mean heat index is evaluated at a torrid 102.2°F (39°C). Weather in July »Weather in August
The last month of the summer, August, is also a moderately hot month in Herrin, Illinois, with an average temperature varying between 66.4°F (19.1°C) and 85.6°F (29.8°C). The shift from July to August is characterized by an average high-temperature of a warm 85.6°F (29.8°C), not significantly different from the 87.4°F (30.8°C) of July. Weather in August »Weather in September
September, the first month of the autumn in Herrin, is still a warm month, with an average temperature fluctuating between 60.4°F (15.8°C) and 80.8°F (27.1°C). September's weather records an average high-temperature of a still warm 80.8°F (27.1°C), showing little deviation from August. Weather in September »Weather in October
October, the same as September, is another refreshing autumn month in Herrin, Illinois, with an average temperature varying between 67.3°F (19.6°C) and 49.3°F (9.6°C). With October's arrival, Herrin's weather changes as the average high-temperature falls from a warm 80.8°F (27.1°C) in September to a comfortable 67.3°F (19.6°C). Weather in October »Weather in November
November, the last month of the autumn in Herrin, is another cool month, with an average temperature ranging between max 53.8°F (12.1°C) and min 38.5°F (3.6°C). Herrin's November weather comes with a decrease in average high-temperatures, moving from a refreshing 67.3°F (19.6°C) in October to a fresh 53.8°F (12.1°C). Weather in November »Weather in December
The first month of the winter, December, is still a chilly month in Herrin, Illinois, with temperature in the range of an average low of 31.8°F (-0.1°C) and an average high of 43.9°F (6.6°C). Arrival of December comes with a reduction in the average high-temperature, falling from a fresh 53.8°F (12.1°C) in November to a chilly 43.9°F (6.6°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
In Herrin, the average lowest temperatures are observed in January, with a high of 39.6°F (4.2°C) and a low of 26.1°F (-3.3°C).
In Herrin, Illinois, during the entire year, the rain falls for 137.6 days and collects up to 23.03" (585mm) of precipitation.
Months with snowfall in Herrin, Illinois, are January through April, October through December.
The months with the most snowfall in Herrin are January and February, with an average 0.94" (24mm) of accumulated snow.
In Herrin, during the entire year, snow falls for 14.5 days and aggregates up to 4.13" (105mm) of snow.
The month with the least sunshine is January, with an average of 4.6h of sunshine.
January, February and December, with an average maximum UV index of 2, are months with the lowest UV index.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Herrin, 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.
April is the month with the most rainfall in Herrin, Illinois. Rain falls for 13.8 days and accumulates 3.11" (79mm) of precipitation.
The most humid month in Herrin, Illinois, is May, with an average relative humidity of 79%.
May through September are months without snowfall.
The months with the highest UV index are May through August, with an average maximum UV index of 6.
June has the longest days of the year, with an average of 14h and 42min of daylight.
The months with the most sunshine in Herrin are June and July, with an average of 10.5h of sunshine.
The month of July, characterized by an average high of 87.4°F (30.8°C) and a low of 68.5°F (20.3°C), is recognized as the warmest in Herrin, Illinois.
The month with the least rainfall is September, when the rain falls for 10.5 days and typically collects 1.1" (28mm) of precipitation.
October is the least humid month in Herrin, with an average relative humidity of 71%.
With an average of 9h and 36min of daylight, December has the shortest days of the year in Herrin.
Average temperature
Herrin, IL
The warmest month (with the highest average high temperature) is July (87.4°F).
The month with the lowest average high temperature is January (39.6°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 (26.1°F).
Average pressure
Herrin, 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
Herrin, 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:
9.1mph - Average wind speed in May:
7.6mph - 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:
6.3mph - Average wind speed in October:
8.1mph - Average wind speed in November:
8.6mph - 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
Herrin, IL
The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is October (71%).
Average rainfall
Herrin, IL
- Average rainfall in January:
1.42" - Average rainfall in February:
1.65" - Average rainfall in March:
2.09" - Average rainfall in April:
3.11" - Average rainfall in May:
2.52" - Average rainfall in June:
2.13"
- Average rainfall in July:
2.09" - Average rainfall in August:
1.89" - Average rainfall in September:
1.1" - Average rainfall in October:
1.89" - Average rainfall in November:
1.69" - Average rainfall in December:
1.46"
The wettest month (with the highest rainfall) is April (3.11").
The driest month (with the least rainfall) is September (1.1").
Average rainfall days
Herrin, IL
- Average rainfall days in January:
8.8 days - Average rainfall days in February:
9.1 days - Average rainfall days in March:
12.8 days - Average rainfall days in April:
13.8 days - Average rainfall days in May:
15.1 days - Average rainfall days in June:
13.3 days
- Average rainfall days in July:
15.3 days - Average rainfall days in August:
13.5 days - Average rainfall days in September:
10.5 days - Average rainfall days in October:
8.5 days - Average rainfall days in November:
7.8 days - Average rainfall days in December:
9.1 days
The month with the highest number of rainy days is July (15.3 days).
The month with the least rainy days is November (7.8 days).
Average snowfall
Herrin, IL
The months with the highest snowfall are January and February (0.94").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Herrin, IL
- Average snowfall days in January:
4.1 days - Average snowfall days in February:
4.3 days - Average snowfall days in March:
1.8 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:
0.9 days - Average snowfall days in December:
2.7 days
The month with the highest number of snowfall days is February (4.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Herrin, 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 6min - 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 24min - Average sunshine in April:
8h and 36min - Average sunshine in May:
9h and 12min - Average sunshine in June:
10h and 30min
- Average sunshine in July:
10h and 30min - Average sunshine in August:
10h and 18min - Average sunshine in September:
9h and 18min - Average sunshine in October:
6h and 30min - Average sunshine in November:
5h and 36min - Average sunshine in December:
4h and 42min
The months with the most sunshine are June and July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).
Average sunshine days
Herrin, IL
- Average sunshine days in January:
18.1 days - Average sunshine days in February:
14.8 days - Average sunshine days in March:
14.9 days - Average sunshine days in April:
13.7 days - Average sunshine days in May:
13.3 days - Average sunshine days in June:
13.3 days
- Average sunshine days in July:
12.9 days - Average sunshine days in August:
14.9 days - Average sunshine days in September:
17.5 days - Average sunshine days in October:
20.6 days - Average sunshine days in November:
19.9 days - Average sunshine days in December:
18.6 days
The month with the most sunshine days is October (20.6 days).
The month with the least sunshine days is July (12.9 days).
Average UV index
Herrin, 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
Herrin, IL
The month with the most cloud cover is February (Cloud cover 51).
The months with the least cloud cover are June, August and September (Cloud cover 28).
Average visibility
Herrin, 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).
