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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 Winthrop Harbor, Illinois, is a freezing cold winter month, with an average temperature varying between 18.3°F (-7.6°C) and 27.9°F (-2.3°C). In Winthrop Harbor, the lowest temperatures are generally noted in January, averaging a high of 27.9°F (-2.3°C) and a low of 18.3°F (-7.6°C). Weather in January »
Weather in February
The last month of the winter, February, is also a subzero cold month in Winthrop Harbor, Illinois, with an average temperature varying between 20.7°F (-6.3°C) and 30.6°F (-0.8°C). In February, Winthrop Harbor experiences a barely noticeable shift in meteorological conditions, with average high-temperatures moving from 27.9°F (-2.3°C) in January to a still subzero cold 30.6°F (-0.8°C). Weather in February »
Weather in March
The first month of the spring, March, is a cold month in Winthrop Harbor, Illinois, with temperature in the range of an average high of 41.2°F (5.1°C) and an average low of 30.6°F (-0.8°C). The shift from February to March sees an increase in the average high-temperature, transitioning from a subzero cold 30.6°F (-0.8°C) to an icy 41.2°F (5.1°C). Weather in March »
Weather in April
April in Winthrop Harbor, Illinois, is a fresh spring month, with an average temperature varying between 38.8°F (3.8°C) and 50.7°F (10.4°C). As Winthrop Harbor transitions into April, the average high-temperature shows a change, moving from a cold 41.2°F (5.1°C) in March to a fresh 50.7°F (10.4°C). Weather in April »
Weather in May
The last month of the spring, May, is a comfortable month in Winthrop Harbor, Illinois, with an average temperature fluctuating between 48.6°F (9.2°C) and 61.3°F (16.3°C). With the onset of May, Winthrop Harbor's average high-temperature experiences a rise, moving from April's fresh 50.7°F (10.4°C) to a refreshing 61.3°F (16.3°C). Weather in May »
Weather in June
June, the first month of the summer in Winthrop Harbor, is a pleasant month, with an average temperature ranging between max 70.5°F (21.4°C) and min 58.6°F (14.8°C). June witnesses an increase in the average high-temperature, moving from a refreshing 61.3°F (16.3°C) in May to a pleasant 70.5°F (21.4°C). Weather in June »
Weather in July
July in Winthrop Harbor, Illinois, is a moderately hot summer month, with temperature in the range of an average low of 65.3°F (18.5°C) and an average high of 77.5°F (25.3°C). Winthrop Harbor's temperature records reveal July as the warmest month, marked by average highs of 77.5°F (25.3°C) and lows of 65.3°F (18.5°C). Weather in July »
Weather in August
August, the last month of the summer in Winthrop Harbor, is also a moderately hot month, with an average temperature ranging between min 64.8°F (18.2°C) and max 77°F (25°C). Winthrop Harbor, Illinois, experiences an average high-temperature of a still warm 77°F (25°C) in August, marking an insignificant shift from 77.5°F (25.3°C) in July. Weather in August »
Weather in September
The first month of the autumn, September, is still a pleasant month in Winthrop Harbor, Illinois, with an average temperature fluctuating between 58.5°F (14.7°C) and 70.9°F (21.6°C). In September, the average high-temperature marginally drops from a warm 77°F (25°C) in August to a pleasant 70.9°F (21.6°C). Weather in September »
Weather in October
October, the same as September, in Winthrop Harbor, Illinois, is a moderate autumn month, with temperature in the range of an average high of 58.3°F (14.6°C) and an average low of 46.9°F (8.3°C). With October's onset, the average high-temperature recedes from September's pleasant 70.9°F (21.6°C) to a moderate 58.3°F (14.6°C). Weather in October »
Weather in November
November, the last month of the autumn in Winthrop Harbor, is another chilly month, with an average temperature fluctuating between 45.1°F (7.3°C) and 34.7°F (1.5°C). With November's onset, the average high-temperature recedes from October's refreshing 58.3°F (14.6°C) to a frosty 45.1°F (7.3°C). Weather in November »
Weather in December
The first month of the winter, December, is also an icy month in Winthrop Harbor, Illinois, with temperature in the range of an average low of 25.3°F (-3.7°C) and an average high of 34°F (1.1°C). December is characterized by a reduction in the average high-temperature, from a chilly 45.1°F (7.3°C) in November to a cold 34°F (1.1°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 Winthrop Harbor?
January proves to be the coldest month, recording an average maximum temperature of 27.9°F (-2.3°C) and a minimum temperature of 18.3°F (-7.6°C).
What is the most humid month in Winthrop Harbor?
January is the most humid month in Winthrop Harbor, with an average relative humidity of 83%.
How many days does it rain in Winthrop Harbor?
Throughout the year, there are 142.5 rainfall days, and 21.5" (546mm) of precipitation is accumulated.
When does it snow in Winthrop Harbor?
Months with snowfall are January through April, October through December.
How much does it snow in Winthrop Harbor?
Throughout the year, there are 45.5 snowfall days, and 9.37" (238mm) of snow is accumulated.
What is the month with the least sunshine in Winthrop Harbor?
With an average of 3.7h of sunshine, January has the least sunshine of the year in Winthrop Harbor.
What is the month with the lowest UV index in Winthrop Harbor?
January and December, with an average maximum UV index of 1, are months with the lowest UV index in Winthrop Harbor.
What is the snowiest month in Winthrop Harbor?
The month with the most snowfall in Winthrop Harbor is February, when snow falls for 9.8 days and typically aggregates up to 2.6" (66mm) of snow.
When is Daylight Saving Time (DST) in Winthrop Harbor?
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.
When it does not snow in Winthrop Harbor?
In Winthrop Harbor, Illinois, snow does not fall in May through September.
What is the rainiest month in Winthrop Harbor?
The months with the most rainfall are June and August, with an average 2.68" (68mm) of precipitation.
When are the longest days in Winthrop Harbor?
June has the longest days of the year in Winthrop Harbor, with an average of 15h and 12min of daylight.
What month is the hottest in Winthrop Harbor?
The warmest period in Winthrop Harbor tends to be July, when average temperatures fluctuate between a high of 77.5°F (25.3°C) and a low of 65.3°F (18.5°C).
What is the month with the most sunshine in Winthrop Harbor?
The months with the most sunshine in Winthrop Harbor are July and August, with an average of 10.5h of sunshine.
What is the month with the highest UV index in Winthrop Harbor?
July and August, with an average maximum UV index of 6, are months with the highest UV index in Winthrop Harbor.
What is the least humid month in Winthrop Harbor?
October and November, with an average relative humidity of 75%, are the least humid months in Winthrop Harbor.
What is the driest month in Winthrop Harbor?
The month with the least rainfall is December, when the rain falls for 8.1 days and typically collects 0.91" (23mm) of precipitation.
What is the month with the shortest days in Winthrop Harbor?
December has the shortest days of the year, with an average of 9h and 6min of daylight.
Average temperature
Winthrop Harbor, IL
The warmest month (with the highest average high temperature) is July (77.5°F).
The month with the lowest average high temperature is January (27.9°F).
The month with the highest average low temperature is July (65.3°F).
The coldest month (with the lowest average low temperature) is January (18.3°F).
Average pressure
Winthrop Harbor, IL
- Average pressure in January:
30.1"Hg - Average pressure in February:
30.09"Hg - Average pressure in March:
30.09"Hg - Average pressure in April:
29.96"Hg - Average pressure in May:
29.96"Hg - Average pressure in June:
29.92"Hg
- Average pressure in July:
29.96"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 (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed
Winthrop Harbor, IL
- Average wind speed in January:
11.9mph - Average wind speed in February:
11.6mph - Average wind speed in March:
10.7mph - Average wind speed in April:
10.9mph - Average wind speed in May:
9.2mph - Average wind speed in June:
8.1mph
- Average wind speed in July:
7.4mph - Average wind speed in August:
7.3mph - Average wind speed in September:
8.8mph - Average wind speed in October:
10.5mph - Average wind speed in November:
11.3mph - Average wind speed in December:
11.1mph
The windiest month (with the highest average wind speed) is January (11.9mph).
The calmest month (with the lowest average wind speed) is August (7.3mph).
Average humidity
Winthrop Harbor, IL
The month with the highest relative humidity is January (83%).
The months with the lowest relative humidity are October and November (75%).
Average rainfall
Winthrop Harbor, IL
- Average rainfall in January:
1.06" - Average rainfall in February:
1.06" - Average rainfall in March:
1.1" - Average rainfall in April:
2.44" - Average rainfall in May:
2.48" - Average rainfall in June:
2.68"
- Average rainfall in July:
2.44" - Average rainfall in August:
2.68" - Average rainfall in September:
1.73" - Average rainfall in October:
1.89" - Average rainfall in November:
1.02" - Average rainfall in December:
0.91"
The wettest months (with the highest rainfall) are June and August (2.68").
The driest month (with the least rainfall) is December (0.91").
Average rainfall days
Winthrop Harbor, IL
- Average rainfall days in January:
6.4 days - Average rainfall days in February:
5.2 days - Average rainfall days in March:
10.5 days - Average rainfall days in April:
14.3 days - Average rainfall days in May:
16 days - Average rainfall days in June:
14.8 days
- Average rainfall days in July:
17 days - Average rainfall days in August:
15.7 days - Average rainfall days in September:
12.7 days - Average rainfall days in October:
12.9 days - Average rainfall days in November:
8.9 days - Average rainfall days in December:
8.1 days
The month with the highest number of rainy days is July (17 days).
The month with the least rainy days is February (5.2 days).
Average snowfall
Winthrop Harbor, IL
The month with the highest snowfall is February (2.6").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Winthrop Harbor, IL
- Average snowfall days in January:
12.4 days - Average snowfall days in February:
9.8 days - Average snowfall days in March:
6.2 days - Average snowfall days in April:
2.4 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:
0.7 days - Average snowfall days in November:
4.2 days - Average snowfall days in December:
9.7 days
The month with the highest number of snowfall days is January (12.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Winthrop Harbor, IL
- Average daylight in January:
9h and 3min - 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 0min - 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 12min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- 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 5min - Average sunshine in May:
8h and 4min - Average sunshine in June:
9h and 5min
- Average sunshine in July:
10h and 3min - Average sunshine in August:
10h and 3min - Average sunshine in September:
9h and 1min - Average sunshine in October:
5h and 4min - Average sunshine in November:
5h and 1min - Average sunshine in December:
4h and 0min
The months with the most sunshine are July and August (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days
Winthrop Harbor, IL
- Average sunshine days in January:
12.4 days - Average sunshine days in February:
12.4 days - Average sunshine days in March:
14.8 days - Average sunshine days in April:
12.2 days - Average sunshine days in May:
12.2 days - Average sunshine days in June:
12.2 days
- Average sunshine days in July:
10.8 days - Average sunshine days in August:
11.6 days - Average sunshine days in September:
13.9 days - Average sunshine days in October:
14.6 days - Average sunshine days in November:
16.5 days - Average sunshine days in December:
15.5 days
The month with the most sunshine days is November (16.5 days).
The month with the least sunshine days is July (10.8 days).
Average UV index
Winthrop Harbor, IL
The months with the highest UV index are July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover
Winthrop Harbor, IL
The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility
Winthrop Harbor, 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).
Winthrop Harbor, Illinois, USA
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