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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, like December, is another subzero cold winter month in Potomac, Illinois, with an average temperature ranging between min 19.8°F (-6.8°C) and max 31.5°F (-0.3°C). In Potomac, the lowest average temperatures are observed in January, with a high of 31.5°F (-0.3°C) and a low of 19.8°F (-6.8°C). Weather in January »
Weather in February
February, the last month of the winter in Potomac, is a cold month, with an average temperature ranging between min 23.4°F (-4.8°C) and max 36°F (2.2°C). In the transition from January to February, Potomac reports an average high-temperature of an icy 36°F (2.2°C), indicating a close resemblance to the prior month. Weather in February »
Weather in March
The first month of the spring, March, is a chilly month in Potomac, Illinois, with an average temperature varying between 48.9°F (9.4°C) and 34.3°F (1.3°C). Potomac, Illinois, sees an increase in the average high-temperature with the arrival of March, moving from February's cold 36°F (2.2°C) to a chilly 48.9°F (9.4°C). Weather in March »
Weather in April
April is a moderate spring month in Potomac, Illinois, with an average temperature ranging between max 60.4°F (15.8°C) and min 44.6°F (7°C). April's arrival is marked by an increase in the average high-temperature, moving from a chilly 48.9°F (9.4°C) in March to a refreshing 60.4°F (15.8°C). Weather in April »
Weather in May
The last month of the spring, May, is a pleasant month in Potomac, Illinois, with an average temperature varying between 71.8°F (22.1°C) and 55°F (12.8°C). May marks a rise in the average high-temperature, moving from April's mild 60.4°F (15.8°C) to a pleasant 71.8°F (22.1°C). Weather in May »
Weather in June
The first month of the summer, June, is a warm month in Potomac, Illinois, with an average temperature varying between 63.1°F (17.3°C) and 79.5°F (26.4°C). June's onset brings a subtle temperature rise, moving from a pleasant 71.8°F (22.1°C) in May to a moderately hot 79.5°F (26.4°C). Weather in June »
Weather in July
July, the same as June, is another warm summer month in Potomac, Illinois, with an average temperature varying between 64.4°F (18°C) and 81.1°F (27.3°C). July, with its high-temperature average of 81.1°F (27.3°C) and a low-temperature average of 64.4°F (18°C), is the warmest month. July's mean heat index 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 Potomac, Illinois, with an average temperature fluctuating between 80.2°F (26.8°C) and 63°F (17.2°C). Potomac experiences a subtle adjustment in high-temperatures to a still moderately hot 80.2°F (26.8°C) with the onset of August, maintaining near parity with July's 81.1°F (27.3°C). Weather in August »
Weather in September
September, the first month of the autumn in Potomac, is also a moderately hot month, with an average temperature ranging between min 57.6°F (14.2°C) and max 75.6°F (24.2°C). The initiation of September sees an average high-temperature of a still moderately hot 75.6°F (24.2°C), showing minor variations from the previous month. Weather in September »
Weather in October
October, like September, in Potomac, Illinois, is another comfortable autumn month, with an average temperature fluctuating between 46.9°F (8.3°C) and 62.8°F (17.1°C). The decrease of average high-temperatures is mild in October, with a decline from a moderately hot 75.6°F (24.2°C) in September to a refreshing 62.8°F (17.1°C). Weather in October »
Weather in November
The last month of the autumn, November, is another chilly month in Potomac, Illinois, with temperature in the range of an average high of 48.4°F (9.1°C) and an average low of 35.4°F (1.9°C). The start of November brings a distinct shift in the average high-temperature, dropping from October's comfortable 62.8°F (17.1°C) to a frosty 48.4°F (9.1°C). Weather in November »
Weather in December
December, the first month of the winter in Potomac, is still a cold month, with an average temperature fluctuating between 37.6°F (3.1°C) and 27.3°F (-2.6°C). Transition into December marks a drop in the average high-temperature, moving from a chilly 48.4°F (9.1°C) in November to an icy 37.6°F (3.1°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 part of the year is the coldest in Potomac?
In Potomac, January is known for its average lowest temperatures, reaching a high of 31.5°F (-0.3°C) and a low of 19.8°F (-6.8°C).
How many days does it rain in Potomac?
Throughout the year, there are 146.3 rainfall days, and 22.76" (578mm) of precipitation is accumulated.
When does it snow in Potomac?
January through April, November and December are months with snowfall in Potomac, Illinois.
How much does it snow in Potomac?
In Potomac, during the entire year, snow falls for 34.2 days and aggregates up to 7.8" (198mm) of snow.
What is the month with the least sunshine in Potomac?
With an average of 3.9h of sunshine, January has the least sunshine of the year.
What is the driest month in Potomac?
February is the month with the least rainfall. Rain falls for 6.7 days and accumulates 1.18" (30mm) of precipitation.
When does it snow the most in Potomac?
The month with the most snowfall in Potomac is February, when snow falls for 8.8 days and typically aggregates up to 2.32" (59mm) of snow.
When is Daylight Saving Time (DST) in Potomac?
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.
What is the wettest month in Potomac?
The month with the most rainfall is May, when the rain falls for 16.6 days and typically aggregates up to 2.76" (70mm) of precipitation.
When it does not snow in Potomac?
In Potomac, snow does not fall in May through October.
When are the longest days in Potomac?
June has the longest days of the year, with an average of 15h and 0min of daylight.
What month has the most sunshine in Potomac?
June has the most sunshine of the year, with an average of 10h of sunshine.
What is the month with the highest UV index in Potomac?
June through August, with an average maximum UV index of 6, are months with the highest UV index in Potomac, Illinois.
What is the warmest month in Potomac?
Potomac experiences its average highest temperatures in July, reaching a peak of 81.1°F (27.3°C) and a minimum of 64.4°F (18°C).
What is the most humid month in Potomac?
With an average relative humidity of 85%, July is the most humid month in Potomac, Illinois.
What is the least humid month in Potomac?
With an average relative humidity of 72%, October is the least humid month.
What is the month with the shortest days in Potomac?
With an average of 9h and 24min of daylight, December has the shortest days of the year.
When is the lowest UV index in Potomac?
With an average maximum UV index of 1, December is the month with the lowest UV index.
Average temperature
Potomac, IL
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (31.5°F).
The month with the highest average low temperature is July (64.4°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).
Average pressure
Potomac, IL
- Average pressure in January:
30.14"Hg - Average pressure in February:
30.11"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.95"Hg - Average pressure in May:
29.96"Hg - Average pressure in June:
29.93"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:
30.02"Hg - Average pressure in November:
30.12"Hg - Average pressure in December:
30.11"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed
Potomac, IL
- Average wind speed in January:
10.5mph - Average wind speed in February:
10.4mph - Average wind speed in March:
10mph - Average wind speed in April:
10.3mph - Average wind speed in May:
8.7mph - Average wind speed in June:
7.6mph
- Average wind speed in July:
6.3mph - Average wind speed in August:
6.3mph - Average wind speed in September:
7.2mph - Average wind speed in October:
9.2mph - Average wind speed in November:
9.9mph - Average wind speed in December:
9.8mph
The windiest month (with the highest average wind speed) is January (10.5mph).
The calmest months (with the lowest average wind speed) are July and August (6.3mph).
Average humidity
Potomac, IL
The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (72%).
Average rainfall
Potomac, IL
- Average rainfall in January:
1.42" - Average rainfall in February:
1.18" - Average rainfall in March:
2.09" - Average rainfall in April:
2.72" - Average rainfall in May:
2.76" - Average rainfall in June:
2.68"
- Average rainfall in July:
2.13" - Average rainfall in August:
2.13" - Average rainfall in September:
1.3" - Average rainfall in October:
1.73" - Average rainfall in November:
1.38" - Average rainfall in December:
1.26"
The wettest month (with the highest rainfall) is May (2.76").
The driest month (with the least rainfall) is February (1.18").
Average rainfall days
Potomac, IL
- Average rainfall days in January:
7.3 days - Average rainfall days in February:
6.7 days - Average rainfall days in March:
11.9 days - Average rainfall days in April:
14.8 days - Average rainfall days in May:
16.6 days - Average rainfall days in June:
16.3 days
- Average rainfall days in July:
17.7 days - Average rainfall days in August:
14.3 days - Average rainfall days in September:
12.1 days - Average rainfall days in October:
11.9 days - Average rainfall days in November:
8.2 days - Average rainfall days in December:
8.5 days
The month with the highest number of rainy days is July (17.7 days).
The month with the least rainy days is February (6.7 days).
Average snowfall
Potomac, IL
The month with the highest snowfall is February (2.32").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days
Potomac, IL
- Average snowfall days in January:
9.8 days - Average snowfall days in February:
8.8 days - Average snowfall days in March:
4.4 days - Average snowfall days in April:
1.1 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:
1.9 days - Average snowfall days in December:
8 days
The month with the highest number of snowfall days is January (9.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Potomac, 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 2min - Average daylight in June:
15h and 0min
- Average daylight in July:
14h and 4min - Average daylight in August:
13h and 4min - Average daylight in September:
12h and 2min - Average daylight in October:
11h and 1min - Average daylight in November:
10h and 0min - Average daylight in December:
9h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in January:
3h and 5min - Average sunshine in February:
4h and 0min - Average sunshine in March:
6h and 1min - Average sunshine in April:
8h and 0min - Average sunshine in May:
8h and 4min - Average sunshine in June:
10h and 0min
- Average sunshine in July:
9h and 5min - Average sunshine in August:
9h and 5min - Average sunshine in September:
8h and 4min - Average sunshine in October:
6h and 1min - Average sunshine in November:
5h and 2min - Average sunshine in December:
4h and 2min
The month with the most sunshine is June (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days
Potomac, IL
- Average sunshine days in January:
15.9 days - Average sunshine days in February:
13.3 days - Average sunshine days in March:
15.1 days - Average sunshine days in April:
12.3 days - Average sunshine days in May:
10.4 days - Average sunshine days in June:
10.7 days
- Average sunshine days in July:
9.5 days - Average sunshine days in August:
12.1 days - Average sunshine days in September:
15.3 days - Average sunshine days in October:
17.1 days - Average sunshine days in November:
18.7 days - Average sunshine days in December:
15.9 days
The month with the most sunshine days is November (18.7 days).
The month with the least sunshine days is July (9.5 days).
Average UV index
Potomac, IL
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover
Potomac, IL
The month with the most cloud cover is January (Cloud cover 59).
The months with the least cloud cover are June, August and September (Cloud cover 33).
Average visibility
Potomac, IL
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
Potomac, Illinois, USA
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