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Cicero, Illinois climate

Dfa Hot-summer humid continental

Cicero has a strongly seasonal cool-temperate climate (Hot-summer humid continental, Köppen Dfa). The hottest month is July with an average daily high near 90°F, while the coldest is January averaging around 15°F at night. Around 41 inches of precipitation falls each year, peaking in May (5.0 inches) and easing off in February (2.0 inches).

☀️ Summers

Hot

Highs near 90°F in July.

About 11 days a year above 90 °F

❄️ Winters

Very cold

Lows near 15°F in January.

About 38 freezing nights a year

🌧️ Rain

Wet

About 41 in of rain a year.

Wettest in May

⛅ Sky & trend

Often cloudy

Cloudy skies much of the year.

+1.8 °F vs 50 years ago

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figures

Clear vs cloudy days

Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day counts

Cicero climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	33	37	49	62	73	84	90	87	80	65	50	38
Avg temp (°F)	24	27	38	51	62	72	77	75	67	54	41	30
Avg low (°F)	15	18	28	39	50	60	64	63	55	43	31	21
Precipitation (in)	2.3	2.0	2.5	4.1	5.0	4.7	4.1	4.5	3.5	3.7	2.7	2.4

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°F)	33	37	49	62	73	84
Avg temp (°F)	24	27	38	51	62	72
Avg low (°F)	15	18	28	39	50	60
Precipitation (in)	2.3	2.0	2.5	4.1	5.0	4.7

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	90	87	80	65	50	38
Avg temp (°F)	77	75	67	54	41	30
Avg low (°F)	64	63	55	43	31	21
Precipitation (in)	4.1	4.5	3.5	3.7	2.7	2.4

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	9	8	9	11	13	12	10	10	8	10	9	10
Days with high ≥ 90°F (days)	—	—	—	—	0.7	3	4	3	1	—	—	—
Days with low ≤ 32°F (days)	9	8	7	2	0.1	—	—	—	—	0.9	4	8
Days with snowfall ≥ 1 in (days)	3	3	1	0.3	—	—	—	—	—	0.1	0.4	2

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	9	8	9	11	13	12
Days with high ≥ 90°F (days)	—	—	—	—	0.7	3
Days with low ≤ 32°F (days)	9	8	7	2	0.1	—
Days with snowfall ≥ 1 in (days)	3	3	1	0.3	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	10	10	8	10	9	10
Days with high ≥ 90°F (days)	4	3	1	—	—	—
Days with low ≤ 32°F (days)	—	—	—	0.9	4	8
Days with snowfall ≥ 1 in (days)	—	—	—	0.1	0.4	2

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	70	70	69	67	66	59	52	51	50	60	67	70
Clear days (≤ 30% cloud)	3	3	4	5	5	6	8	9	10	8	4	3
Partly cloudy days (30–70%)	11	10	10	9	10	11	14	12	10	9	9	9
Cloudy days (≥ 70%)	17	16	17	16	17	13	9	10	10	14	17	18
Relative humidity (%)	86	83	79	76	76	77	76	74	72	74	80	86
Wind speed (mph)	8.6	8.5	8.6	8.6	7.3	5.9	5.1	4.9	5.7	7.0	7.9	7.9

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	70	70	69	67	66	59
Clear days (≤ 30% cloud)	3	3	4	5	5	6
Partly cloudy days (30–70%)	11	10	10	9	10	11
Cloudy days (≥ 70%)	17	16	17	16	17	13
Relative humidity (%)	86	83	79	76	76	77
Wind speed (mph)	8.6	8.5	8.6	8.6	7.3	5.9

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	52	51	50	60	67	70
Clear days (≤ 30% cloud)	8	9	10	8	4	3
Partly cloudy days (30–70%)	14	12	10	9	9	9
Cloudy days (≥ 70%)	9	10	10	14	17	18
Relative humidity (%)	76	74	72	74	80	86
Wind speed (mph)	5.1	4.9	5.7	7.0	7.9	7.9

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Little Red School House (NOAA GHCN station USC00115110), about 18 km from the city centre.

Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.

How we build these numbers →