Naperville, IL: Climate and Weather (2024)

Seasonal Weather Patterns in Naperville, IL

Temperature

Average Daily Temperature (°F)

	Naperville, IL	U.S. Avg.	Difference
January	23	43	-20
July	75	79	-4

Average Monthly Number of Hot and Freezing Days

	Naperville, IL	U.S. Avg.	Difference
Summer: Hot Days	2	11	-9
Winter: Freezing Days	25	12	+13

Read more in Temperature

Sunshine

Average Annual Number of Clear and Cloudy Days

	Naperville, IL	U.S. Avg.	Difference
Clear Days	170	217	-47
Cloudy Days	195	148	+47

Average Daylight Hours per Day

	Naperville, IL	U.S. Avg.	Difference
January	9	10	-1
July	15	15	No difference

Read more in Sunshine

Precipitation

Average Annual Number of Rainy and Snow Days

	Naperville, IL	U.S. Avg.	Difference
Rainy Days	115	102	+13
Snow Days	20	7	+13

Average Monthly Humidity (%) in Naperville, IL

	Naperville, IL	U.S. Avg.	Difference
January	75	68	+7%
July	69	61	+8%

Read more in Precipitation

Is Naperville, IL, Hot or Cold?

Low, Average, and High Temperatures (°F)

	Low	Average	High
January	17	23	31
February	20	26	35
March	31	38	47
April	41	53	60
May	51	63	69
June	62	70	79
July	64	75	82
August	62	71	79
September	54	67	73
October	43	53	61
November	32	41	47
December	22	28	34

Average Monthly Number of Hot Days

	Naperville, IL	U.S. Avg.	Difference
January	0	0	No difference
February	0	0	No difference
March	0	0	No difference
April	0	1	-1
May	0	3	-3
June	2	8	-6
July	2	13	-11
August	2	12	-10
September	1	6	-5
October	0	2	-2
November	0	0	No difference
December	0	0	No difference

Average Monthly Number of Freezing Days

	Naperville, IL	U.S. Avg.	Difference
January	26	13	+13
February	23	10	+13
March	20	7	+13
April	7	2	+5
May	0	0	No difference
June	0	0	No difference
July	0	0	No difference
August	0	0	No difference
September	0	0	No difference
October	6	2	+4
November	16	6	+10
December	26	12	+14

Naperville, IL: Clear/Cloudy Skies, and Daylight Hours

Average Number of Clear Days

	Naperville, IL	U.S. Avg.	Difference
January	14	17	-3
February	13	16	-3
March	14	17	-3
April	13	17	-4
May	14	18	-4
June	14	19	-5
July	14	20	-6
August	14	20	-6
September	15	19	-4
October	16	19	-3
November	15	18	-3
December	14	17	-3

Average Number of Cloudy Days

	Naperville, IL	U.S. Avg.	Difference
January	17	14	+3
February	15	12	+3
March	17	14	+3
April	17	13	+4
May	17	13	+4
June	16	11	+5
July	17	11	+6
August	17	11	+6
September	15	11	+4
October	15	12	+3
November	15	12	+3
December	17	14	+3

Average Daylight Hours per Day

	Naperville, IL	U.S. Avg.	Difference
January	9	10	-1
February	11	11	No difference
March	12	12	No difference
April	14	13	+1
May	15	14	+1
June	16	15	+1
July	15	15	No difference
August	14	14	No difference
September	13	13	No difference
October	12	12	No difference
November	10	10	No difference
December	9	10	-1

Naperville, IL: Rainy Days, Snow Days, and Humidity

Average Number of Rainy Days

	Naperville, IL	U.S. Avg.	Difference
January	10	9	+1
February	8	8	No difference
March	10	9	+1
April	10	7	+3
May	9	7	+2
June	10	7	+3
July	10	7	+3
August	10	6	+4
September	10	7	+3
October	8	7	+1
November	10	8	+2
December	10	8	+2

Average Number of Snow Days

	Naperville, IL	U.S. Avg.	Difference
January	6	2	+4
February	5	2	+3
March	2	1	+1
April	0	0	No difference
May	0	0	No difference
June	0	0	No difference
July	0	0	No difference
August	0	0	No difference
September	0	0	No difference
October	0	0	No difference
November	1	1	No difference
December	6	2	+4

Average Humidity (%)

	Naperville, IL	U.S. Avg.	Difference
January	75	68	+7%
February	72	66	+6%
March	69	63	+6%
April	64	59	+5%
May	64	61	+3%
June	65	60	+5%
July	69	61	+8%
August	70	62	+8%
September	69	63	+6%
October	68	63	+5%
November	71	65	+6%
December	75	68	+7%

The assessments presented on this website, including those related to crime, safety, cost of living, and other location characteristics (e.g., states, cities, towns, villages, neighborhoods, areas, landmarks), are based on various sources and our internal research methods. These assessments are not guaranteed to be accurate or complete and should not be used as the sole basis for making any decisions.