Climate and monthly weather forecastSomonauk, IL
Climate and monthly weather forecast
Weather in January
January, like December, is another subzero cold winter month in Somonauk, Illinois, with temperature in the range of an average low of 15.6°F (-9.1°C) and an average high of 27.5°F (-2.5°C). In Somonauk, January is the coldest month, with temperatures averaging a high of 27.5°F (-2.5°C) and a low of 15.6°F (-9.1°C). Weather in January »Weather in February
February, the last month of the winter in Somonauk, is a cold month, with temperature in the range of an average low of 18.9°F (-7.3°C) and an average high of 32°F (0°C). February is marked by an average high-temperature of an icy 32°F (0°C), almost identical to the preceding month. Weather in February »Weather in March
March, the first month of the spring in Somonauk, is a chilly month, with temperature in the range of an average high of 45.7°F (7.6°C) and an average low of 31.1°F (-0.5°C). March's arrival signals an increase in average high-temperatures, moving from February's wintry 32°F (0°C) to a frosty 45.7°F (7.6°C). Weather in March »Weather in April
April is a mild spring month in Somonauk, Illinois, with temperature in the range of an average high of 57°F (13.9°C) and an average low of 40.8°F (4.9°C). As March transitions into April, a change in temperatures is observed, with average highs moving from a chilly 45.7°F (7.6°C) to a mild 57°F (13.9°C). Weather in April »Weather in May
The last month of the spring, May, is an agreeable month in Somonauk, Illinois, with an average temperature ranging between min 52.2°F (11.2°C) and max 69.3°F (20.7°C). May's arrival coincides with a temperature rise, moving from April's moderate 57°F (13.9°C) to a pleasant 69.3°F (20.7°C). Weather in May »Weather in June
The first month of the summer, June, is a moderately hot month in Somonauk, Illinois, with an average temperature varying between 78.1°F (25.6°C) and 60.6°F (15.9°C). In June, the average high-temperature marginally rises from a pleasant 69.3°F (20.7°C) in May to a warm 78.1°F (25.6°C). Weather in June »Weather in July
July, the same as June, is a moderately hot summer month in Somonauk, Illinois, with an average temperature varying between 80.6°F (27°C) and 63.3°F (17.4°C). Somonauk witnesses the warmest weather in July, with temperatures averaging a high of 80.6°F (27°C) and a low of 63.3°F (17.4°C). The average heat index in July is computed to be a tropical 86°F (30°C). Weather in July »Weather in August
August, the last month of the summer in Somonauk, is also a moderately hot month, with an average temperature fluctuating between 79°F (26.1°C) and 61.5°F (16.4°C). Somonauk observes a minor difference in average high-temperatures between July's 80.6°F (27°C) and August's 79°F (26.1°C). Weather in August »Weather in September
The first month of the autumn, September, is also a moderately hot month in Somonauk, Illinois, with temperature in the range of an average high of 73.8°F (23.2°C) and an average low of 55.4°F (13°C). As Somonauk transitions from August to September, the average high-temperatures adjust to a still warm 73.8°F (23.2°C), nearly the same as the previous 79°F (26.1°C). Weather in September »Weather in October
October, the same as September, in Somonauk, Illinois, is another mild autumn month, with an average temperature varying between 44.8°F (7.1°C) and 60.3°F (15.7°C). Somonauk in October demonstrates a small temperature transition, adjusting from an average high of a moderately hot 73.8°F (23.2°C) in September to a refreshing 60.3°F (15.7°C). Weather in October »Weather in November
The last month of the autumn, November, is another chilly month in Somonauk, Illinois, with an average temperature fluctuating between 45.5°F (7.5°C) and 32.9°F (0.5°C). Somonauk in November sees a clear temperature decline, with average high-temperatures decreasing from a mild 60.3°F (15.7°C) in October to a chilly 45.5°F (7.5°C). Weather in November »Weather in December
The first month of the winter, December, is also a wintry month in Somonauk, Illinois, with an average temperature ranging between max 34.2°F (1.2°C) and min 23.9°F (-4.5°C). Somonauk's December weather comes with a decrease in average high-temperatures, moving from a chilly 45.5°F (7.5°C) in November to an icy 34.2°F (1.2°C). Weather in December »Updated: Aug 3, 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 time of the year is January, with temperatures averaging a high of 27.5°F (-2.5°C) and a low of 15.6°F (-9.1°C).
January is the month with the least rainfall. Rain falls for 5.5 days and accumulates 1.69" (43mm) of precipitation.
Throughout the year, there are 162.1 rainfall days, and 33.54" (852mm) of precipitation is accumulated.
January through April, October through December are months with snowfall.
The month with the most snowfall is January, when snow falls for 12.3 days and typically aggregates up to 4.61" (117mm) of snow.
Throughout the year, there are 43.6 snowfall days, and 16.73" (425mm) of snow is accumulated.
The month with the least sunshine is January, with an average of 3.9h of sunshine.
January and December, with an average maximum UV index of 1, are months with the lowest UV index.
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 is May, when the rain falls for 18.9 days and typically aggregates up to 4.49" (114mm) of precipitation.
In Somonauk, snow does not fall in May through September.
With an average of 15h and 6min of daylight, June has the longest days of the year.
The months with the most sunshine are June through August, with an average of 9.6h of sunshine.
June and August, with an average maximum UV index of 6, are months with the highest UV index.
July temperatures tend to peak at an average high of 80.6°F (27°C) and dip to a low of 63.3°F (17.4°C).
With an average relative humidity of 85%, July is the most humid month.
The least humid month in Somonauk is October, with an average relative humidity of 74%.
With an average of 9h and 12min of daylight, December has the shortest days of the year.
Average temperature
Somonauk, IL
The warmest month (with the highest average high temperature) is July (80.6°F).
The month with the lowest average high temperature is January (27.5°F).
The month with the highest average low temperature is July (63.3°F).
The coldest month (with the lowest average low temperature) is January (15.6°F).
Average pressure
Somonauk, IL
- Average pressure in January:
30.12"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:
29.98"Hg - Average pressure in September:
30.03"Hg - Average pressure in October:
30.01"Hg - Average pressure in November:
30.09"Hg - Average pressure in December:
30.1"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed
Somonauk, IL
- Average wind speed in January:
9.8mph - Average wind speed in February:
9.8mph - Average wind speed in March:
9.6mph - Average wind speed in April:
9.9mph - Average wind speed in May:
8.4mph - Average wind speed in June:
7.3mph
- Average wind speed in July:
6.3mph - Average wind speed in August:
6mph - Average wind speed in September:
7mph - Average wind speed in October:
8.8mph - Average wind speed in November:
9.4mph - Average wind speed in December:
9.2mph
The windiest month (with the highest average wind speed) is April (9.9mph).
The calmest month (with the lowest average wind speed) is August (6mph).
Average humidity
Somonauk, IL
The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (74%).
Average rainfall
Somonauk, IL
- Average rainfall in January:
1.69" - Average rainfall in February:
1.77" - Average rainfall in March:
2.05" - Average rainfall in April:
3.94" - Average rainfall in May:
4.49" - Average rainfall in June:
4.25"
- Average rainfall in July:
3.58" - Average rainfall in August:
2.99" - Average rainfall in September:
2.4" - Average rainfall in October:
2.87" - Average rainfall in November:
1.73" - Average rainfall in December:
1.77"
The wettest month (with the highest rainfall) is May (4.49").
The driest month (with the least rainfall) is January (1.69").
Average rainfall days
Somonauk, IL
- Average rainfall days in January:
5.5 days - Average rainfall days in February:
5.7 days - Average rainfall days in March:
12.8 days - Average rainfall days in April:
17.3 days - Average rainfall days in May:
18.9 days - Average rainfall days in June:
19.3 days
- Average rainfall days in July:
19.3 days - Average rainfall days in August:
17.6 days - Average rainfall days in September:
13.8 days - Average rainfall days in October:
13.5 days - Average rainfall days in November:
10.4 days - Average rainfall days in December:
8 days
The months with the highest number of rainy days are June and July (19.3 days).
The month with the least rainy days is January (5.5 days).
Average snowfall
Somonauk, IL
The month with the highest snowfall is January (4.61").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Somonauk, IL
- Average snowfall days in January:
12.3 days - Average snowfall days in February:
10.8 days - Average snowfall days in March:
6.1 days - Average snowfall days in April:
1.6 days - Average snowfall days in May:
0.1 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:
0.4 days - Average snowfall days in November:
3.4 days - Average snowfall days in December:
8.9 days
The month with the highest number of snowfall days is January (12.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Somonauk, IL
- Average daylight in January:
9h and 36min - 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 6min
- Average daylight in July:
14h and 48min - 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 54min - Average daylight in December:
9h and 12min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in January:
3h and 54min - Average sunshine in February:
4h and 0min - Average sunshine in March:
6h and 6min - Average sunshine in April:
7h and 42min - Average sunshine in May:
8h and 36min - Average sunshine in June:
9h and 36min
- Average sunshine in July:
9h and 36min - Average sunshine in August:
9h and 36min - Average sunshine in September:
8h and 42min - Average sunshine in October:
5h and 36min - Average sunshine in November:
5h and 6min - Average sunshine in December:
4h and 6min
The months with the most sunshine are June, July and August (Average sunshine: 9h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days
Somonauk, IL
- Average sunshine days in January:
15.4 days - Average sunshine days in February:
12.5 days - Average sunshine days in March:
14.2 days - Average sunshine days in April:
9.7 days - Average sunshine days in May:
9.7 days - Average sunshine days in June:
8.9 days
- Average sunshine days in July:
8.2 days - Average sunshine days in August:
10.1 days - Average sunshine days in September:
13.5 days - Average sunshine days in October:
15.3 days - Average sunshine days in November:
17 days - Average sunshine days in December:
15.6 days
The month with the most sunshine days is November (17 days).
The month with the least sunshine days is July (8.2 days).
Average UV index
Somonauk, IL
The months with the highest UV index are June and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover
Somonauk, IL
The month with the most cloud cover is January (Cloud cover 60).
The months with the least cloud cover are August and September (Cloud cover 34).
Average visibility
Somonauk, 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).
