Climate and monthly weather forecastMarengo, IL
Climate and monthly weather forecast
Weather in January
January, the same as December, in Marengo, Illinois, is another subzero cold winter month, with an average temperature varying between 26.1°F (-3.3°C) and 13.8°F (-10.1°C). January, on average, is the coldest month, registering a high temperature of 26.1°F (-3.3°C) and a low of 13.8°F (-10.1°C). Weather in January »Weather in February
February, the last month of the winter in Marengo, is also a subzero cold month, with an average temperature varying between 17.1°F (-8.3°C) and 30°F (-1.1°C). Marengo experiences a transition to a still subzero cold 30°F (-1.1°C) in average high-temperatures with the arrival of February, not greatly differing from January's 26.1°F (-3.3°C). Weather in February »Weather in March
The first month of the spring, March, is a chilly month in Marengo, Illinois, with an average temperature ranging between min 29.1°F (-1.6°C) and max 43.7°F (6.5°C). The rise of average high-temperatures is seen in March, with an increase from a freezing cold 30°F (-1.1°C) in February to a frosty 43.7°F (6.5°C). Weather in March »Weather in April
April in Marengo, Illinois, is a refreshing spring month, with temperature in the range of an average high of 55.6°F (13.1°C) and an average low of 38.8°F (3.8°C). With the onset of April, Marengo experiences a temperature shift, with the average high-temperature moving from a frosty 43.7°F (6.5°C) in March to a moderate 55.6°F (13.1°C). Weather in April »Weather in May
May, the last month of the spring in Marengo, is a refreshing month, with an average temperature ranging between max 67.6°F (19.8°C) and min 50.2°F (10.1°C). With the onset of May, Marengo's average high-temperature experiences a rise, moving from April's 55.6°F (13.1°C) to a still refreshing 67.6°F (19.8°C). Weather in May »Weather in June
The first month of the summer, June, is a moderately hot month in Marengo, Illinois, with an average temperature ranging between min 59°F (15°C) and max 76.5°F (24.7°C). Marengo's weather in June shows a minor rise in the average high-temperature, moving slightly up from May's comfortable 67.6°F (19.8°C) to a warm 76.5°F (24.7°C). Weather in June »Weather in July
July, like June, in Marengo, Illinois, is another warm summer month, with an average temperature ranging between min 62.6°F (17°C) and max 79.7°F (26.5°C). Temperature records mark July as the warmest month, with highs averaging 79.7°F (26.5°C) and lows at 62.6°F (17°C). Weather in July »Weather in August
The last month of the summer, August, is also a moderately hot month in Marengo, Illinois, with an average temperature ranging between max 78.1°F (25.6°C) and min 60.4°F (15.8°C). In August, Marengo experiences a barely noticeable shift in meteorological conditions, with average high-temperatures moving from 79.7°F (26.5°C) in July to a still moderately hot 78.1°F (25.6°C). Weather in August »Weather in September
The first month of the autumn, September, is still a pleasant month in Marengo, Illinois, with temperature in the range of an average low of 54.1°F (12.3°C) and an average high of 72.1°F (22.3°C). Marengo in September undergoes a slight reduction in the average high-temperature, shifting from August's warm 78.1°F (25.6°C) to an agreeable 72.1°F (22.3°C). Weather in September »Weather in October
October, like September, is a moderate autumn month in Marengo, Illinois, with an average temperature ranging between min 43.2°F (6.2°C) and max 58.8°F (14.9°C). Marengo in October undergoes a mild reduction in the average high-temperature, shifting from September's pleasant 72.1°F (22.3°C) to a refreshing 58.8°F (14.9°C). Weather in October »Weather in November
The last month of the autumn, November, is also a frosty month in Marengo, Illinois, with an average temperature ranging between max 44.4°F (6.9°C) and min 31.1°F (-0.5°C). As November arrives, a noticeable drop in the average high-temperature is witnessed, moving from a moderate 58.8°F (14.9°C) in October to a frosty 44.4°F (6.9°C). Weather in November »Weather in December
December, the first month of the winter in Marengo, is also an icy month, with an average temperature fluctuating between 22.3°F (-5.4°C) and 32.5°F (0.3°C). Marengo in December undergoes a mild reduction in the average high-temperature, shifting from November's frosty 44.4°F (6.9°C) to an icy 32.5°F (0.3°C). Weather in December »Updated: Jul 25, 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 lowest temperatures are recorded in January, with averages reaching a high of 26.1°F (-3.3°C) and a low of 13.8°F (-10.1°C).
January is the most humid month in Marengo, with an average relative humidity of 86%.
In Marengo, during the entire year, the rain falls for 154.6 days and collects up to 30.31" (770mm) of precipitation.
Months with snowfall are January through April, October through December.
January is the month with the most snowfall. Snow falls for 12.3 days and accumulates 5.28" (134mm) of snow.
Throughout the year, there are 44.9 snowfall days, and 17.24" (438mm) of snow is accumulated.
January has the least sunshine of the year, with an average of 3.6h of sunshine.
January and December, with an average maximum UV index of 1, are months with the lowest UV index.
February and November are months with the least rain when the rain falls for 4.8 days and typically aggregates up to 1.5" (38mm) of rain.
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.
In Marengo, snow does not fall in May through September.
The months with the highest UV index are May through August, with an average maximum UV index of 5.
The month with the most rainfall is June, when the rain falls for 18.6 days and typically aggregates up to 4.21" (107mm) of precipitation.
With an average of 15h and 12min of daylight, June has the longest days of the year.
Marengo registers the average highest temperatures during July, with peaks of 79.7°F (26.5°C) and lows of 62.6°F (17°C).
The month with the most sunshine is July, with an average of 9.6h of sunshine.
With an average relative humidity of 76%, October is the least humid month.
With an average of 9h and 12min of daylight, December has the shortest days of the year.
Average temperature
Marengo, IL
The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is January (26.1°F).
The month with the highest average low temperature is July (62.6°F).
The coldest month (with the lowest average low temperature) is January (13.8°F).
Average pressure
Marengo, IL
- Average pressure in January:
30.11"Hg - Average pressure in February:
30.1"Hg - Average pressure in March:
30.09"Hg - Average pressure in April:
29.95"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:
29.97"Hg - Average pressure in September:
30.03"Hg - Average pressure in October:
30"Hg - Average pressure in November:
30.09"Hg - Average pressure in December:
30.09"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed
Marengo, IL
- Average wind speed in January:
9.7mph - Average wind speed in February:
9.8mph - Average wind speed in March:
9.5mph - Average wind speed in April:
9.9mph - Average wind speed in May:
8.3mph - Average wind speed in June:
7.3mph
- Average wind speed in July:
6.4mph - Average wind speed in August:
6.1mph - Average wind speed in September:
7.1mph - Average wind speed in October:
8.6mph - Average wind speed in November:
9.3mph - Average wind speed in December:
9.1mph
The windiest month (with the highest average wind speed) is April (9.9mph).
The calmest month (with the lowest average wind speed) is August (6.1mph).
Average humidity
Marengo, IL
The month with the highest relative humidity is January (86%).
The month with the lowest relative humidity is October (76%).
Average rainfall
Marengo, IL
- Average rainfall in January:
1.61" - Average rainfall in February:
1.5" - Average rainfall in March:
1.77" - Average rainfall in April:
3.54" - Average rainfall in May:
3.74" - Average rainfall in June:
4.21"
The wettest month (with the highest rainfall) is June (4.21").
The driest months (with the least rainfall) are February and November (1.5").
Average rainfall days
Marengo, IL
- Average rainfall days in January:
5.6 days - Average rainfall days in February:
4.8 days - Average rainfall days in March:
11.5 days - Average rainfall days in April:
16.3 days - Average rainfall days in May:
18.8 days - Average rainfall days in June:
18.6 days
- Average rainfall days in July:
19.3 days - Average rainfall days in August:
16.1 days - Average rainfall days in September:
12.8 days - Average rainfall days in October:
13.3 days - Average rainfall days in November:
9.5 days - Average rainfall days in December:
8 days
The month with the highest number of rainy days is July (19.3 days).
The month with the least rainy days is February (4.8 days).
Average snowfall
Marengo, IL
The month with the highest snowfall is January (5.28").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Marengo, IL
- Average snowfall days in January:
12.3 days - Average snowfall days in February:
10.4 days - Average snowfall days in March:
5.5 days - Average snowfall days in April:
2 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:
0.5 days - Average snowfall days in November:
4 days - Average snowfall days in December:
10.2 days
The month with the highest number of snowfall days is January (12.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Marengo, IL
- Average daylight in January:
9h and 30min - Average daylight in February:
10h and 36min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 24min - Average daylight in May:
14h and 36min - Average daylight in June:
15h and 12min
- Average daylight in July:
14h and 54min - Average daylight in August:
13h and 48min - Average daylight in September:
12h and 30min - Average daylight in October:
11h and 6min - Average daylight in November:
9h and 48min - Average daylight in December:
9h and 12min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in January:
3h and 36min - Average sunshine in February:
3h and 42min - Average sunshine in March:
6h and 0min - Average sunshine in April:
7h and 24min - Average sunshine in May:
8h and 30min - Average sunshine in June:
9h and 30min
- Average sunshine in July:
9h and 36min - Average sunshine in August:
9h and 30min - Average sunshine in September:
8h and 30min - Average sunshine in October:
5h and 24min - Average sunshine in November:
5h and 0min - Average sunshine in December:
3h and 48min
The month with the most sunshine is July (Average sunshine: 9h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days
Marengo, IL
- Average sunshine days in January:
14.8 days - Average sunshine days in February:
14.1 days - Average sunshine days in March:
15.2 days - Average sunshine days in April:
11.3 days - Average sunshine days in May:
10.6 days - Average sunshine days in June:
9.5 days
- Average sunshine days in July:
9.8 days - Average sunshine days in August:
12.3 days - Average sunshine days in September:
14.8 days - Average sunshine days in October:
16.4 days - Average sunshine days in November:
17.5 days - Average sunshine days in December:
16.5 days
The month with the most sunshine days is November (17.5 days).
The month with the least sunshine days is June (9.5 days).
Average UV index
Marengo, IL
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover
Marengo, IL
The month with the most cloud cover is January (Cloud cover 63).
The months with the least cloud cover are August and September (Cloud cover 35).
Average visibility
Marengo, IL
The months with the highest visibility are March, April, May, June, October, November and December (6mi).
The months with the lowest visibility are January, February, July, August and September (5mi).
