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Muscatine, Iowa climate

Dfa Hot-summer humid continental

Muscatine has a strongly seasonal cool-temperate climate (Hot-summer humid continental, Köppen Dfa). The hottest month is July with an average daily high near 29°C, while the coldest is January averaging around −10°C at night. Precipitation totals about 926 mm a year and is strongly seasonal — June alone averages 127 mm while January barely receives 30 mm.

☀️ Summers

Warm

Highs near 29°C in July.

About 11 days a year above 32 °C

❄️ Winters

Very cold

Lows near −10°C in January.

About 69 freezing nights a year

🌧️ Rain

Moderate rainfall

About 926 mm of rain a year.

Wettest in June

⛅ Sky & trend

Partly cloudy

A roughly even mix of sun and cloud.

−0.4 °C 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

Muscatine climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	−1	2	9	16	22	27	29	28	25	18	9	2
Avg temp (°C)	−6	−3	4	10	17	22	24	23	19	12	4	−2
Avg low (°C)	−10	−8	−1	4	11	16	18	17	13	6	−1	−7
Precipitation (mm)	30	39	58	88	122	127	102	100	91	71	54	43

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	−1	2	9	16	22	27
Avg temp (°C)	−6	−3	4	10	17	22
Avg low (°C)	−10	−8	−1	4	11	16
Precipitation (mm)	30	39	58	88	122	127

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	29	28	25	18	9	2
Avg temp (°C)	24	23	19	12	4	−2
Avg low (°C)	18	17	13	6	−1	−7
Precipitation (mm)	102	100	91	71	54	43

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	11	10	12	12	13	13	9	10	9	10	9	11
Days with high ≥ 32°C (days)	—	—	—	—	0.7	3	4	3	1.0	0.1	—	—
Days with low ≤ 0°C (days)	16	14	10	3	0.2	—	—	—	—	2	9	15
Days with snowfall ≥ 2.5 cm (days)	2	2	0.7	0.1	—	—	—	—	—	—	0.1	2

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	11	10	12	12	13	13
Days with high ≥ 32°C (days)	—	—	—	—	0.7	3
Days with low ≤ 0°C (days)	16	14	10	3	0.2	—
Days with snowfall ≥ 2.5 cm (days)	2	2	0.7	0.1	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	9	10	9	10	9	11
Days with high ≥ 32°C (days)	4	3	1.0	0.1	—	—
Days with low ≤ 0°C (days)	—	—	—	2	9	15
Days with snowfall ≥ 2.5 cm (days)	—	—	—	—	0.1	2

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	65	66	65	65	65	58	50	50	47	58	63	66
Clear days (≤ 30% cloud)	5	4	5	6	5	7	9	10	12	8	6	5
Partly cloudy days (30–70%)	11	10	11	9	10	10	13	12	10	9	10	10
Cloudy days (≥ 70%)	15	14	15	16	16	13	9	9	9	14	15	16
Relative humidity (%)	86	82	77	74	75	76	73	71	70	73	79	85
Wind speed (m/s)	3.7	3.7	3.8	3.8	3.2	2.6	2.3	2.2	2.6	3.1	3.4	3.4

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	65	66	65	65	65	58
Clear days (≤ 30% cloud)	5	4	5	6	5	7
Partly cloudy days (30–70%)	11	10	11	9	10	10
Cloudy days (≥ 70%)	15	14	15	16	16	13
Relative humidity (%)	86	82	77	74	75	76
Wind speed (m/s)	3.7	3.7	3.8	3.8	3.2	2.6

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	50	50	47	58	63	66
Clear days (≤ 30% cloud)	9	10	12	8	6	5
Partly cloudy days (30–70%)	13	12	10	9	10	10
Cloudy days (≥ 70%)	9	9	9	14	15	16
Relative humidity (%)	73	71	70	73	79	85
Wind speed (m/s)	2.3	2.2	2.6	3.1	3.4	3.4

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Illinois City Dam 16 (NOAA GHCN station USC00114355), about 3 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 →