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Cairo, Illinois climate

Cfa Humid subtropical

Cairo has a seasonal mild-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is July with an average daily high near 32°C, while the coldest is January averaging around −3°C at night. Precipitation is fairly even year-round, totalling about 1278 mm. Light snow accumulates each winter (23 cm of snow per year on average).

☀️ Summers

Hot

Highs near 32°C in July.

About 50 days a year above 32 °C

❄️ Winters

Cold

Lows near −3°C in January.

About 83 freezing nights a year

🌧️ Rain & snow

Wet

About 1278 mm of rain a year, plus 23 cm of snow.

Snow falls through the winter months

⛅ Sky & trend

Partly cloudy

A roughly even mix of sun and cloud.

+0.6 °C vs 50 years ago

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation split into rain and snow · 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

Cairo climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	7	10	15	21	26	31	32	32	28	22	15	9
Avg temp (°C)	2	5	9	15	20	25	27	26	22	15	9	4
Avg low (°C)	−3	−1	4	9	14	19	21	19	15	9	3	−1
Precipitation (mm)	98	100	118	131	124	115	109	79	90	101	104	109
Snowfall (cm)	7	8	3	—	—	—	—	—	—	0	1	5

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	7	10	15	21	26	31
Avg temp (°C)	2	5	9	15	20	25
Avg low (°C)	−3	−1	4	9	14	19
Precipitation (mm)	98	100	118	131	124	115
Snowfall (cm)	7	8	3	—	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	32	32	28	22	15	9
Avg temp (°C)	27	26	22	15	9	4
Avg low (°C)	21	19	15	9	3	−1
Precipitation (mm)	109	79	90	101	104	109
Snowfall (cm)	—	—	—	0	1	5

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	10	9	11	11	11	9	9	8	7	8	9	10
Days with high ≥ 32°C (days)	—	—	—	—	1	11	17	14	7	0.4	—	—
Days with low ≤ 0°C (days)	22	17	10	2	—	—	—	—	—	2	11	19
Days with snowfall ≥ 2.5 cm (days)	0.8	0.8	0.2	0.0	—	—	—	—	—	0.0	0.1	0.4

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	10	9	11	11	11	9
Days with high ≥ 32°C (days)	—	—	—	—	1	11
Days with low ≤ 0°C (days)	22	17	10	2	—	—
Days with snowfall ≥ 2.5 cm (days)	0.8	0.8	0.2	0.0	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	9	8	7	8	9	10
Days with high ≥ 32°C (days)	17	14	7	0.4	—	—
Days with low ≤ 0°C (days)	—	—	—	2	11	19
Days with snowfall ≥ 2.5 cm (days)	—	—	—	0.0	0.1	0.4

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	66	69	65	61	63	54	50	47	46	51	58	66
Clear days (≤ 30% cloud)	5	4	6	7	6	9	10	11	12	11	8	5
Partly cloudy days (30–70%)	9	8	9	9	10	10	12	11	9	9	8	10
Cloudy days (≥ 70%)	17	16	16	14	15	11	9	9	9	11	14	16
Relative humidity (%)	84	83	81	79	80	79	76	69	66	70	77	84
Wind speed (m/s)	2.8	2.9	2.9	2.8	2.2	1.8	1.7	1.6	1.8	2.1	2.4	2.5

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	66	69	65	61	63	54
Clear days (≤ 30% cloud)	5	4	6	7	6	9
Partly cloudy days (30–70%)	9	8	9	9	10	10
Cloudy days (≥ 70%)	17	16	16	14	15	11
Relative humidity (%)	84	83	81	79	80	79
Wind speed (m/s)	2.8	2.9	2.9	2.8	2.2	1.8

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	50	47	46	51	58	66
Clear days (≤ 30% cloud)	10	11	12	11	8	5
Partly cloudy days (30–70%)	12	11	9	9	8	10
Cloudy days (≥ 70%)	9	9	9	11	14	16
Relative humidity (%)	76	69	66	70	77	84
Wind speed (m/s)	1.7	1.6	1.8	2.1	2.4	2.5

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Paducah (NOAA GHCN station USW00003816), about 37 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 →