Naperville (IL) Temperature by Month

This graph shows the average minimum and maximum temperatures throughout the year in Naperville (Illinois), the United States of America. The minimum temperature is often recorded between 4 AM and 6 AM, while the highest temperature is usually reached at 3 PM. During this time the sun's heating effect is the strongest.

Temperature patterns do vary with the seasons. In winter, the time of minimum and maximum temperatures can shift slightly compared to summer.

• The months of May, June, July, August and September have nice average temperatures.
• On average, the warmest month(s) are July and August.
• Cold season / winter is in the months January and February.
• On average, the warmest month is July with 29°C.
• On average, the coolest month is January with -1°C.
• The average annual maximum temperature is 15°C.
• The average annual minimum temperature is 4°C.