Climate and monthly weather forecastWestmont, IL
Climate and monthly weather forecast
Weather in January
January, like December, is another subzero cold winter month in Westmont, Illinois, with an average temperature ranging between min 17.1°F (-8.3°C) and max 28.8°F (-1.8°C). Westmont experiences its lowest average temperatures in January, reaching a peak of 28.8°F (-1.8°C) and a minimum of 17.1°F (-8.3°C). Weather in January »Weather in February
The last month of the winter, February, is an icy month in Westmont, Illinois, with an average temperature varying between 32.5°F (0.3°C) and 19.9°F (-6.7°C). February's advent denotes a minor fluctuation in the average high-temperature to a cold 32.5°F (0.3°C) from January's 28.8°F (-1.8°C). Weather in February »Weather in March
The first month of the spring, March, is a chilly month in Westmont, Illinois, with temperature in the range of an average low of 31.5°F (-0.3°C) and an average high of 45.1°F (7.3°C). March marks a rise in the average high-temperature, moving from February's cold 32.5°F (0.3°C) to a chilly 45.1°F (7.3°C). Weather in March »Weather in April
April is a mild spring month in Westmont, Illinois, with temperature in the range of an average low of 40.6°F (4.8°C) and an average high of 56.5°F (13.6°C). With the onset of April, the average high-temperature slightly shifts from March's chilly 45.1°F (7.3°C) to a moderate 56.5°F (13.6°C). Weather in April »Weather in May
The last month of the spring, May, is a pleasant month in Westmont, Illinois, with an average temperature varying between 52.2°F (11.2°C) and 68.9°F (20.5°C). An escalation in the average high-temperature is seen with the onset of May, moving from a mild 56.5°F (13.6°C) in April to a pleasant 68.9°F (20.5°C). Weather in May »Weather in June
June, the first month of the summer in Westmont, is a warm month, with an average temperature fluctuating between 61.7°F (16.5°C) and 78.3°F (25.7°C). Westmont in June shows a temperature shift, moving from an average high of an agreeable 68.9°F (20.5°C) in May to a warm 78.3°F (25.7°C). Weather in June »Weather in July
July, like June, in Westmont, Illinois, is a moderately hot summer month, with an average temperature ranging between min 66.4°F (19.1°C) and max 82.4°F (28°C). The month of July sees the highest average temperatures, reaching 82.4°F (28°C) at the peak and 66.4°F (19.1°C) at the low. During July, the heat index is computed to be a tropical 89.6°F (32°C). Weather in July »Weather in August
The last month of the summer, August, is another warm month in Westmont, Illinois, with temperature in the range of an average high of 81.1°F (27.3°C) and an average low of 64.8°F (18.2°C). The arrival of August brings an average high-temperature of a still warm 81.1°F (27.3°C), subtly diverging from July's 82.4°F (28°C). Weather in August »Weather in September
September, the first month of the autumn in Westmont, is still a warm month, with an average temperature varying between 57.9°F (14.4°C) and 74.3°F (23.5°C). September signifies a minor drop in average high-temperature, transitioning from a moderately hot 81.1°F (27.3°C) in August to a still warm 74.3°F (23.5°C). Weather in September »Weather in October
October, the same as September, in Westmont, Illinois, is another refreshing autumn month, with temperature in the range of an average high of 60.6°F (15.9°C) and an average low of 45.7°F (7.6°C). With October's onset, the average high-temperature recedes from September's moderately hot 74.3°F (23.5°C) to a moderate 60.6°F (15.9°C). Weather in October »Weather in November
November, the last month of the autumn in Westmont, is another chilly month, with an average temperature ranging between min 33.6°F (0.9°C) and max 45.7°F (7.6°C). The changeover to November signals a significant decrease in the average high-temperature, dropping from a mild 60.6°F (15.9°C) in October to a frosty 45.7°F (7.6°C). Weather in November »Weather in December
The first month of the winter, December, is also an icy month in Westmont, Illinois, with an average temperature varying between 34.5°F (1.4°C) and 25°F (-3.9°C). Westmont in December experiences a subtle temperature decline, with average high-temperatures reducing from a frosty 45.7°F (7.6°C) in November to an icy 34.5°F (1.4°C). Weather in December »Updated: Aug 17, 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
January is the coldest month, with an average high-temperature of 28.8°F (-1.8°C) and an average low-temperature of 17.1°F (-8.3°C).
January and February, with an average relative humidity of 82%, are most humid months.
Throughout the year, in Westmont, there are 118.5 rainfall days, and 13.74" (349mm) of precipitation is accumulated.
Months with snowfall in Westmont are January through April, October through December.
Throughout the year, there are 34.9 snowfall days, and 7.2" (183mm) of snow is accumulated.
January has the least sunshine of the year, with an average of 3.7h of sunshine.
January is the month with the lowest UV index, with an average maximum UV index of 1.
The month with the most snowfall is February, when snow falls for 8.6 days and typically aggregates up to 2.28" (58mm) of snow.
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.
May is the month with the most rainfall. Rain falls for 14.9 days and accumulates 1.97" (50mm) of precipitation.
May through September are months without snowfall.
With an average of 15h and 12min of daylight, June has the longest days of the year.
June through August, with an average maximum UV index of 6, are months with the highest UV index.
July stands out as Westmont's warmest month, with an average high-temperature of 82.4°F (28°C) and a low-temperature of 66.4°F (19.1°C).
The month with the most sunshine is August, with an average of 10h of sunshine.
With an average relative humidity of 72%, October is the least humid month.
December is the month with the least rainfall. Rain falls for 4.9 days and accumulates 0.63" (16mm) of precipitation.
December has the shortest days of the year, with an average of 9h and 12min of daylight.
Average temperature
Westmont, IL
The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (28.8°F).
The month with the highest average low temperature is July (66.4°F).
The coldest month (with the lowest average low temperature) is January (17.1°F).
Average pressure
Westmont, 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:
30.09"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
Westmont, IL
- Average wind speed in January:
9.7mph - Average wind speed in February:
9.6mph - Average wind speed in March:
9.2mph - Average wind speed in April:
9.4mph - Average wind speed in May:
8mph - Average wind speed in June:
7.1mph
- Average wind speed in July:
6.3mph - Average wind speed in August:
6.1mph - Average wind speed in September:
7mph - Average wind speed in October:
8.6mph - Average wind speed in November:
9.3mph - Average wind speed in December:
9mph
The windiest month (with the highest average wind speed) is January (9.7mph).
The calmest month (with the lowest average wind speed) is August (6.1mph).
Average humidity
Westmont, IL
The months with the highest relative humidity are January and February (82%).
The month with the lowest relative humidity is October (72%).
Average rainfall
Westmont, IL
- Average rainfall in January:
0.67" - Average rainfall in February:
0.71" - Average rainfall in March:
0.75" - Average rainfall in April:
1.38" - Average rainfall in May:
1.97" - Average rainfall in June:
1.61"
- Average rainfall in July:
1.61" - Average rainfall in August:
1.34" - Average rainfall in September:
1.18" - Average rainfall in October:
1.22" - Average rainfall in November:
0.67" - Average rainfall in December:
0.63"
The wettest month (with the highest rainfall) is May (1.97").
The driest month (with the least rainfall) is December (0.63").
Average rainfall days
Westmont, IL
- Average rainfall days in January:
4.3 days - Average rainfall days in February:
4.2 days - Average rainfall days in March:
9.1 days - Average rainfall days in April:
12.8 days - Average rainfall days in May:
14.9 days - Average rainfall days in June:
14.3 days
- Average rainfall days in July:
14.6 days - Average rainfall days in August:
12.2 days - Average rainfall days in September:
11.5 days - Average rainfall days in October:
9.8 days - Average rainfall days in November:
5.9 days - Average rainfall days in December:
4.9 days
The month with the highest number of rainy days is May (14.9 days).
The month with the least rainy days is February (4.2 days).
Average snowfall
Westmont, IL
The month with the highest snowfall is February (2.28").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Westmont, IL
- Average snowfall days in January:
9.7 days - Average snowfall days in February:
8.6 days - Average snowfall days in March:
4.9 days - Average snowfall days in April:
1.4 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:
0.4 days - Average snowfall days in November:
2.6 days - Average snowfall days in December:
7.2 days
The month with the highest number of snowfall days is January (9.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Westmont, 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 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 42min - Average sunshine in February:
3h and 54min - Average sunshine in March:
6h and 0min - Average sunshine in April:
7h and 36min - Average sunshine in May:
8h and 30min - Average sunshine in June:
9h and 36min
- Average sunshine in July:
9h and 54min - Average sunshine in August:
10h and 0min - 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 month with the most sunshine is August (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days
Westmont, IL
- Average sunshine days in January:
19.7 days - Average sunshine days in February:
17.3 days - Average sunshine days in March:
17.4 days - Average sunshine days in April:
13.8 days - Average sunshine days in May:
13.7 days - Average sunshine days in June:
12.3 days
- Average sunshine days in July:
11.8 days - Average sunshine days in August:
14.8 days - Average sunshine days in September:
16.1 days - Average sunshine days in October:
19.6 days - Average sunshine days in November:
20.4 days - Average sunshine days in December:
20.7 days
The month with the most sunshine days is December (20.7 days).
The month with the least sunshine days is July (11.8 days).
Average UV index
Westmont, IL
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover
Westmont, IL
The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility
Westmont, 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).
