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Contents
- The climate of Naperville
- The best time to visit Naperville
- The worst time to visit Naperville
- Spring Weather in Naperville
- Summer Weather in Naperville
- Autumn Weather in Naperville
- 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
A covered bridge over a river along the famous Naperville Riverwalk in Naperville, Illinois
The climate of Naperville
Located in Illinois, USA, Naperville experiences a Dfa type climate as per the Köppen climate classification. The city rests within a Humid Continental climate zone with hot summers and no dry season. Throughout the year, the city witnesses distinct changes in its weather conditions that significantly vary with each passing month.
The temperatures fluctuate considerably as the year progresses. High temperatures in the summer rise to 81.7°F (27.6°C) in July, while the winter months see them descend to a chilly 28.4°F (-2°C) in January. Likewise, a similar pattern is identifiable in the low temperatures, which peak at 65.1°F (18.4°C) during July before falling to 17.1°F (-8.3°C) in January.
Humidity remains relatively high all year round, hovering between 73% and 83%. The city experiences rainfall throughout the year, ranging from 0.71" (18mm) up in December to 2.09" (53mm) in May. Despite showing a consistent pattern, rainfall in Naperville peaks in the months of May and July, adding a unique nuance to the weather profile of the city.
The temperatures fluctuate considerably as the year progresses. High temperatures in the summer rise to 81.7°F (27.6°C) in July, while the winter months see them descend to a chilly 28.4°F (-2°C) in January. Likewise, a similar pattern is identifiable in the low temperatures, which peak at 65.1°F (18.4°C) during July before falling to 17.1°F (-8.3°C) in January.
Humidity remains relatively high all year round, hovering between 73% and 83%. The city experiences rainfall throughout the year, ranging from 0.71" (18mm) up in December to 2.09" (53mm) in May. Despite showing a consistent pattern, rainfall in Naperville peaks in the months of May and July, adding a unique nuance to the weather profile of the city.
The best time to visit Naperville
The period from May to September presents the finest weather for visitors in Naperville. During these months, the city experiences high temperatures ranging from a warm 69.1°F (20.6°C) to a hot 81.7°F (27.6°C). With ample daylight ranging from 13.4 hours in April to 15.2 hours in June, tourists have plenty of time to explore the city. Despite the relatively high rainfall during these months (between 1.85" (47mm) in June and 2.09" (53mm) in May), the number of sunshine hours remains high, thereby ensuring a pleasant overall climate.
The worst time to visit Naperville
January and February are considered the least ideal months to visit Naperville due to the freezing winter temperatures. The high temperatures during these months range from 28.4°F (-2°C) to 32.4°F (0.2°C) and the low temperatures drop between 17.1°F (-8.3°C) to 19.9°F (-6.7°C), accompanied by substantial snowfall. Further, these months only have 9.6 to 10.6 daylight hours, making outdoor activities quite challenging.
Spring Weather in Naperville
Spring in Naperville, spanning from March to May, witnesses a consistent rise in temperatures. The city experiences high temperatures that vary from a moderate 45.1°F (7.3°C) in March and peak at a warm 69.1°F (20.6°C) in May. The number of daylight hours also increases progressively, from 12 hours in March to 14.6 hours in May. Despite the relative increase in rainfall (from 0.87" (22mm) in March to 2.09" (53mm) in May), the overall climate remains pleasant and mild.
Summer Weather in Naperville
Summers in Naperville, from June through August, are typically warm. The city experiences average high temperatures hovering from 78.4°F (25.8°C) to 81.7°F (27.6°C). This period also witnesses long daylight hours, from 14.6 hours in June to 13.8 hours in August. However, the warmer months also see high levels of rainfall, especially in June and July, but these downpours are usually brief.
Autumn Weather in Naperville
During the autumn months, from September to November, Naperville sees a steady drop in temperatures. The highs decrease from 73.8°F (23.2°C) in September to 45.9°F (7.7°C) in November. Similarly, daylight hours diminish from 12.5 hours to 9.8 hours over the course of the season. With reduced rainfall as autumn progresses. Daylight hours are minimal, ranging from 9.6 hours in December to 10.6 hours in February. Despite these challenging conditions, the city takes on a winter wonderland appearance, offering a unique appeal for winter enthusiasts.
Weather in January
The city of Naperville welcomes the new year with cold and frosty weather conditions. The city witnesses a high of 28.4°F (-2°C) and a low of 17.1°F (-8.3°C). Snow showers blanket the city, making the cityscape resemble a picture-perfect winter postcard. Weather in January »
Weather in February
As temperatures slightly rise from January, Naperville experiences continued winter conditions in February. The city sees a slight increase in temperature with highs of 32.4°F (0.2°C) and lows of 19.9°F (-6.7°C) dominating. Weather in February »
Weather in March
March sees the transition from winter to spring in Naperville, with a significant rise in temperatures. The climatic data shows the monthly average high reaching up to 45.1°F (7.3°C), and lows settling down to a comfortable 31.1°F (-0.5°C). Weather in March »
Weather in April
April usually brings warmer weather and brighter skies to Naperville. Temperatures take a warm turn, reaching an average high of 56.8°F (13.8°C) and an average low of 40.5°F (4.7°C). The cityscape changes dramatically as trees burst into different shades of green. Weather in April »
Weather in May
Although May announces the arrival of spring in Naperville, temperatures often fluctuate. The climate data reveals average highs of up to 69.1°F (20.6°C) and lows of 51.8°F (11°C). While afternoons can get quite warm, mornings and evenings remain pleasantly cool. Weather in May »
Weather in June
June is the first month of summer, and the weather in Naperville shifts from mild to warm. With temperatures soaring to an average high of 78.4°F (25.8°C) and dipping to an average low of 61.3°F (16.3°C), summer is truly underway. Weather in June »
Weather in July
No month is hotter in Naperville than July, reaching high averages of 81.7°F (27.6°C) and lows of 65.1°F (18.4°C). While summer is in full swing, the weather tends to be humid, creating some discomfort for residents and visitors. Weather in July »
Weather in August
August weather in Naperville still exhibits summer conditions but with a slight dip in temperature. Although the city experiences highs of 80.1°F (26.7°C) and lows of 63.5°F (17.5°C), there is a clear hint of the approaching autumn. Weather in August »
Weather in September
As a transitional month, September's weather varies between warm and cool in Naperville. The weather data shows highs of 73.8°F (23.2°C) and lows of 57°F (13.9°C). However, the abundance of sunlight gradually lessens and the city slowly starts to change color as fall approaches, painting Naperville with hues of orange and yellow. The transition into September subtly indicates a reduction in the average high-temperature, down to a still warm 73.8°F (23.2°C) from August's moderately hot 80.1°F (26.7°C). Weather in September »
Weather in October
Autumn is in full swing in Naperville during October, with average temperatures dipping noticeably to a high of 60.6°F (15.9°C) and a low of 45.5°F (7.5°C). Step outside and the city’s atmosphere is filled with the faint smell of dry leaves. Weather in October »
Weather in November
The city of Naperville experiences a cool November as winter slowly begins to set in. The weather cools down significantly with an average high of 45.9°F (7.7°C) and a low of 33.1°F (0.6°C). Despite the cold, Naperville maintains a picturesque landscape with red and orange leaves falling from trees and filling the streets. With the beginning of November, Naperville's average high-temperature experiences a significant decrease, moving from a mild 60.6°F (15.9°C) in October to a chilly 45.9°F (7.7°C). Weather in November »
Weather in December
The weather in Naperville takes a sharp turn heading to the holiday season in December. Chilly yet festive, the city's weather ventures into colder territory, with an average high of 34.3°F (1.3°C) and a low of 24.4°F (-4.2°C). Weather in December »
Updated: Aug 28, 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?
January is the coldest month, with the temperature often reaching an average high of 28.4°F (-2°C) and an average low of 17.1°F (-8.3°C).
What is the most humid month?
January and February, with an average relative humidity of 83%, are most humid months.
How much does it rain?
In Naperville, during the entire year, the rain falls for 132.2 days and collects up to 16.22" (412mm) of precipitation.
When does it snow?
Months with snowfall are January through April, October through December.
When does it snow the most?
January is the month with the most snowfall. Snow falls for 11.1 days and accumulates 1.85" (47mm) of snow.
How many days does it snow in Naperville?
In Naperville, during the entire year, snow falls for 38.7 days and aggregates up to 6.93" (176mm) of snow.
What is the month with the least sunshine?
January has the least sunshine of the year, with an average of 3.8h of sunshine.
What are the months with the lowest UV index?
The months with the lowest UV index are January and December, with an average maximum UV index of 1.
When is Daylight Saving Time (DST)?
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?
The month with the most rainfall in Naperville is May, when the rain falls for 14.8 days and typically aggregates up to 2.09" (53mm) of precipitation.
When it does not snow?
May through September are months without snowfall.
When are the longest days in Naperville?
The month with the longest days in Naperville, Illinois, is June, with an average of 15h and 12min of daylight.
What are the months with the highest UV index?
The months with the highest UV index are June through August, with an average maximum UV index of 6.
What month is the hottest?
In Naperville, the average highest temperatures are observed in July, with a high of 81.7°F (27.6°C) and a low of 65.1°F (18.4°C).
What is the month with the most sunshine?
The months with the most sunshine are July and August, with an average of 10h of sunshine.
What is the least humid month?
The least humid month is October, with an average relative humidity of 73%.
What is the driest month?
December is the month with the least rainfall. Rain falls for 6.4 days and accumulates 0.71" (18mm) of precipitation.
What is the month with the shortest days?
December has the shortest days of the year, with an average of 9h and 12min of daylight.
Average temperature
Naperville, IL
The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (28.4°F).
The month with the highest average low temperature is July (65.1°F).
The coldest month (with the lowest average low temperature) is January (17.1°F).
Average pressure
Naperville, 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
Naperville, IL
- Average wind speed in January:
9.7mph - Average wind speed in February:
9.6mph - Average wind speed in March:
9.3mph - Average wind speed in April:
9.6mph - Average wind speed in May:
8.1mph - Average wind speed in June:
7.1mph
- Average wind speed in July:
6.2mph - Average wind speed in August:
6mph - 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:
9.1mph
The windiest month (with the highest average wind speed) is January (9.7mph).
The calmest month (with the lowest average wind speed) is August (6mph).
Average humidity
Naperville, IL
The months with the highest relative humidity are January and February (83%).
The month with the lowest relative humidity is October (73%).
Average rainfall
Naperville, IL
- Average rainfall in January:
0.83" - Average rainfall in February:
0.79" - Average rainfall in March:
0.87" - Average rainfall in April:
1.69" - Average rainfall in May:
2.09" - Average rainfall in June:
1.85"
- Average rainfall in July:
2.05" - Average rainfall in August:
1.81" - Average rainfall in September:
1.38" - Average rainfall in October:
1.42" - Average rainfall in November:
0.75" - Average rainfall in December:
0.71"
The wettest month (with the highest rainfall) is May (2.09").
The driest month (with the least rainfall) is December (0.71").
Average rainfall days
Naperville, IL
- Average rainfall days in January:
4.8 days - Average rainfall days in February:
4.4 days - Average rainfall days in March:
9.8 days - Average rainfall days in April:
13.6 days - Average rainfall days in May:
14.8 days - Average rainfall days in June:
15.3 days
- Average rainfall days in July:
17.3 days - Average rainfall days in August:
15.3 days - Average rainfall days in September:
12.2 days - Average rainfall days in October:
11 days - Average rainfall days in November:
7.3 days - Average rainfall days in December:
6.4 days
The month with the highest number of rainy days is July (17.3 days).
The month with the least rainy days is February (4.4 days).
Average snowfall
Naperville, IL
The month with the highest snowfall is January (1.85").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Naperville, IL
- Average snowfall days in January:
11.1 days - Average snowfall days in February:
9.1 days - Average snowfall days in March:
5.3 days - Average snowfall days in April:
2 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:
8.1 days
The month with the highest number of snowfall days is January (11.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Naperville, 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 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in January:
3h and 5min - Average sunshine in February:
3h and 5min - Average sunshine in March:
6h and 1min - 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:
10h and 0min - Average sunshine in August:
10h and 0min - Average sunshine in September:
8h and 5min - Average sunshine in October:
5h and 4min - Average sunshine in November:
5h and 1min - Average sunshine in December:
4h and 1min
The months with the most sunshine are July and August (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days
Naperville, IL
- Average sunshine days in January:
17.8 days - Average sunshine days in February:
15.7 days - Average sunshine days in March:
16 days - Average sunshine days in April:
12.8 days - Average sunshine days in May:
12.9 days - Average sunshine days in June:
12.2 days
- Average sunshine days in July:
10.2 days - Average sunshine days in August:
11.3 days - Average sunshine days in September:
14.5 days - Average sunshine days in October:
17.7 days - Average sunshine days in November:
19.6 days - Average sunshine days in December:
19.1 days
The month with the most sunshine days is November (19.6 days).
The month with the least sunshine days is July (10.2 days).
Average UV index
Naperville, IL
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover
Naperville, 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 31).
Average visibility
Naperville, 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).
Naperville, Illinois, USA
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