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Contents
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
Weather in January
January, the same as December, in Posen, Illinois, is another subzero cold winter month, with temperature in the range of an average high of 29.7°F (-1.3°C) and an average low of 18.9°F (-7.3°C). January proves to be the coldest month, recording an average maximum temperature of 29.7°F (-1.3°C) and a minimum temperature of 18.9°F (-7.3°C). Weather in January »
Weather in February
February, the last month of the winter in Posen, is a wintry month, with an average temperature ranging between min 21.2°F (-6°C) and max 33.1°F (0.6°C). February's weather displays an average high-temperature of a wintry 33.1°F (0.6°C), slightly varied from January's 29.7°F (-1.3°C). Weather in February »
Weather in March
March, the first month of the spring in Posen, is a chilly month, with an average temperature varying between 32.4°F (0.2°C) and 45.5°F (7.5°C). The onset of March brings a rise in the average high-temperature, elevating from an icy 33.1°F (0.6°C) in February to a frosty 45.5°F (7.5°C). Weather in March »
Weather in April
April is a moderate spring month in Posen, Illinois, with an average temperature varying between 56.7°F (13.7°C) and 41.7°F (5.4°C). Posen sees an increase in average high-temperatures during April, moving from a chilly 45.5°F (7.5°C) in March to a mild 56.7°F (13.7°C). Weather in April »
Weather in May
The last month of the spring, May, is an agreeable month in Posen, Illinois, with an average temperature varying between 52.3°F (11.3°C) and 68.7°F (20.4°C). The start of May is characterized by an increase in the average high-temperature, transitioning from a refreshing 56.7°F (13.7°C) in April to a pleasant 68.7°F (20.4°C). Weather in May »
Weather in June
June, the first month of the summer in Posen, is a moderately hot month, with an average temperature ranging between max 77.7°F (25.4°C) and min 61.7°F (16.5°C). As May transitions into June, a change in temperatures is observed, with average highs moving from a pleasant 68.7°F (20.4°C) to a moderately hot 77.7°F (25.4°C). Weather in June »
Weather in July
July, the same as June, is a moderately hot summer month in Posen, Illinois, with temperature in the range of an average high of 81.3°F (27.4°C) and an average low of 65.8°F (18.8°C). Posen experiences its highest average temperatures in July, reaching a peak of 81.3°F (27.4°C) and a minimum of 65.8°F (18.8°C). The heat index for July is calculated to be a hot 87.8°F (31°C). Weather in July »
Weather in August
The last month of the summer, August, is also a moderately hot month in Posen, Illinois, with an average temperature varying between 80.1°F (26.7°C) and 64.6°F (18.1°C). August's weather records an average high-temperature of a still warm 80.1°F (26.7°C), showing little deviation from July. Weather in August »
Weather in September
September, the first month of the autumn in Posen, is still a warm month, with an average temperature fluctuating between 73.9°F (23.3°C) and 58.3°F (14.6°C). The commencement of September includes a gentle temperature shift, with the average high-temperature dropping a bit from a warm 80.1°F (26.7°C) in August to a still moderately hot 73.9°F (23.3°C). Weather in September »
Weather in October
October, like September, in Posen, Illinois, is another enjoyable autumn month, with temperature in the range of an average high of 61.2°F (16.2°C) and an average low of 46.9°F (8.3°C). October's onset brings a reduction in the average high-temperature, from a warm 73.9°F (23.3°C) in September to an enjoyable 61.2°F (16.2°C). Weather in October »
Weather in November
The last month of the autumn, November, is another chilly month in Posen, Illinois, with temperature in the range of an average low of 34.9°F (1.6°C) and an average high of 46.9°F (8.3°C). In Posen, the average high-temperature in November decreases from an enjoyable 61.2°F (16.2°C) in October to a chilly 46.9°F (8.3°C). Weather in November »
Weather in December
The first month of the winter, December, is still a cold month in Posen, Illinois, with an average temperature ranging between min 25.9°F (-3.4°C) and max 35.6°F (2°C). During Posen's transition into December, the average high-temperature lessens, moving from a frosty 46.9°F (8.3°C) in November to a cold 35.6°F (2°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
What is the coldest month in Posen?
January is Posen's coldest month, registering average high temperatures of 29.7°F (-1.3°C) and lows of 18.9°F (-7.3°C).
What is the most humid month in Posen?
January and February, with an average relative humidity of 82%, are most humid months in Posen, Illinois.
How many days does it rain in Posen?
In Posen, Illinois, during the entire year, the rain falls for 155.6 days and collects up to 31.3" (795mm) of precipitation.
When does it snow in Posen?
Months with snowfall in Posen are January through April, October through December.
When does it snow the most in Posen?
January is the month with the most snowfall in Posen, Illinois. Snow falls for 12.6 days and accumulates 4.53" (115mm) of snow.
How many days does it snow in Posen?
In Posen, during the entire year, snow falls for 44.6 days and aggregates up to 16.46" (418mm) of snow.
What is the month with the least sunshine in Posen?
January has the least sunshine of the year, with an average of 3.6h of sunshine.
When is Daylight Saving Time (DST) in Posen?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Posen, Illinois, 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.
What is the wettest month in Posen?
May is the month with the most rainfall in Posen, Illinois. Rain falls for 17.4 days and accumulates 4.17" (106mm) of precipitation.
When it does not snow in Posen?
May through September are months without snowfall.
When are the longest days in Posen?
With an average of 15h and 6min of daylight, June has the longest days of the year in Posen.
What are the months with the highest UV index in Posen?
June and July, with an average maximum UV index of 6, are months with the highest UV index.
What time of the year is the hottest in Posen?
Posen's temperatures tend to reach their peak averages in July, with a high of 81.3°F (27.4°C) and a low of 65.8°F (18.8°C).
What month has the most sunshine in Posen?
With an average of 10.1h of sunshine, August has the most sunshine of the year.
What is the least humid month in Posen?
With an average relative humidity of 73%, October is the least humid month in Posen.
What is the driest month in Posen?
The month with the least rainfall is December, when the rain falls for 7.9 days and typically collects 1.54" (39mm) of precipitation.
What is the month with the shortest days in Posen?
December has the shortest days of the year in Posen, Illinois, with an average of 9h and 12min of daylight.
When is the lowest UV index in Posen?
The month with the lowest UV index in Posen, Illinois, is December, with an average maximum UV index of 1.
Average temperature
Posen, IL
The warmest month (with the highest average high temperature) is July (81.3°F).
The month with the lowest average high temperature is January (29.7°F).
The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).
Average pressure
Posen, 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:
29.98"Hg - Average pressure in September:
30.03"Hg - Average pressure in October:
30.01"Hg - Average pressure in November:
30.1"Hg - Average pressure in December:
30.1"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
Posen, IL
- Average wind speed in January:
10.2mph - Average wind speed in February:
9.9mph - Average wind speed in March:
9.5mph - Average wind speed in April:
9.8mph - Average wind speed in May:
8.3mph - Average wind speed in June:
7.4mph
- Average wind speed in July:
6.4mph - Average wind speed in August:
6.3mph - Average wind speed in September:
7.3mph - Average wind speed in October:
9.1mph - Average wind speed in November:
9.8mph - Average wind speed in December:
9.5mph
The windiest month (with the highest average wind speed) is January (10.2mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).
Average humidity
Posen, IL
The months with the highest relative humidity are January and February (82%).
The month with the lowest relative humidity is October (73%).
Average rainfall
Posen, IL
- Average rainfall in January:
1.77" - Average rainfall in February:
1.69" - Average rainfall in March:
2.09" - Average rainfall in April:
3.43" - Average rainfall in May:
4.17" - Average rainfall in June:
3.82"
- Average rainfall in July:
3.31" - Average rainfall in August:
2.56" - Average rainfall in September:
2.48" - Average rainfall in October:
2.76" - Average rainfall in November:
1.69" - Average rainfall in December:
1.54"
The wettest month (with the highest rainfall) is May (4.17").
The driest month (with the least rainfall) is December (1.54").
Average rainfall days
Posen, IL
- Average rainfall days in January:
6.8 days - Average rainfall days in February:
6.1 days - Average rainfall days in March:
12.7 days - Average rainfall days in April:
16.8 days - Average rainfall days in May:
17.4 days - Average rainfall days in June:
17.4 days
- Average rainfall days in July:
17.6 days - Average rainfall days in August:
14.8 days - Average rainfall days in September:
13.4 days - Average rainfall days in October:
14.3 days - Average rainfall days in November:
10.4 days - Average rainfall days in December:
7.9 days
The month with the highest number of rainy days is July (17.6 days).
The month with the least rainy days is February (6.1 days).
Average snowfall
Posen, IL
The month with the highest snowfall is January (4.53").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Posen, IL
- Average snowfall days in January:
12.6 days - Average snowfall days in February:
10.5 days - Average snowfall days in March:
6.1 days - Average snowfall days in April:
1.9 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:
0.3 days - Average snowfall days in November:
4 days - Average snowfall days in December:
9.1 days
The month with the highest number of snowfall days is January (12.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Posen, IL
- Average daylight in January:
9h and 4min - Average daylight in February:
10h and 4min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 2min - Average daylight in May:
14h and 4min - Average daylight in June:
15h and 1min
- Average daylight in July:
14h and 5min - Average daylight in August:
13h and 5min - Average daylight in September:
12h and 3min - Average daylight in October:
11h and 1min - Average daylight in November:
9h and 5min - Average daylight in December:
9h and 1min
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 4min - Average sunshine in February:
3h and 5min - Average sunshine in March:
6h and 0min - Average sunshine in April:
7h and 4min - Average sunshine in May:
8h and 4min - Average sunshine in June:
9h and 4min
- Average sunshine in July:
9h and 5min - Average sunshine in August:
10h and 1min - Average sunshine in September:
8h and 5min - Average sunshine in October:
5h and 5min - Average sunshine in November:
5h and 1min - Average sunshine in December:
4h and 0min
The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days
Posen, IL
- Average sunshine days in January:
13 days - Average sunshine days in February:
11.8 days - Average sunshine days in March:
13.8 days - Average sunshine days in April:
10.2 days - Average sunshine days in May:
11.8 days - Average sunshine days in June:
10.4 days
- Average sunshine days in July:
11.1 days - Average sunshine days in August:
13.3 days - Average sunshine days in September:
14 days - Average sunshine days in October:
14.4 days - Average sunshine days in November:
16.4 days - Average sunshine days in December:
15 days
The month with the most sunshine days is November (16.4 days).
The month with the least sunshine days is April (10.2 days).
Average UV index
Posen, IL
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover
Posen, IL
The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility
Posen, IL
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
Posen, Illinois, USA
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