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Bloomington, Indiana climate

Cfa Humid subtropical

Bloomington has a strongly seasonal cool-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is July with an average daily high near 30°C, while the coldest is January averaging around −6°C at night. Precipitation is fairly even year-round, totalling about 1254 mm. Light snow accumulates each winter (44 cm of snow per year on average).

☀️ Summers

Warm

Highs near 30°C in July.

About 21 days a year above 32 °C

❄️ Winters

Cold

Lows near −6°C in January.

About 108 freezing nights a year

🌧️ Rain & snow

Wet

About 1254 mm of rain a year, plus 44 cm of snow.

Snow falls through the winter months

⛅ Sky & trend

Partly cloudy

A roughly even mix of sun and cloud.

−0.0 °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

Bloomington climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	3	5	11	18	23	28	30	29	26	19	12	5
Avg temp (°C)	−2	0	6	12	17	22	24	23	20	13	6	1
Avg low (°C)	−6	−5	0	6	12	17	18	18	13	7	1	−3
Precipitation (mm)	96	75	93	132	136	137	116	86	97	97	100	89
Snowfall (cm)	18	11	3	0	—	—	—	—	—	0	1	11

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	3	5	11	18	23	28
Avg temp (°C)	−2	0	6	12	17	22
Avg low (°C)	−6	−5	0	6	12	17
Precipitation (mm)	96	75	93	132	136	137
Snowfall (cm)	18	11	3	0	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	30	29	26	19	12	5
Avg temp (°C)	24	23	20	13	6	1
Avg low (°C)	18	18	13	7	1	−3
Precipitation (mm)	116	86	97	97	100	89
Snowfall (cm)	—	—	—	0	1	11

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	12	10	11	12	13	11	10	8	7	9	9	11
Days with high ≥ 32°C (days)	—	—	—	—	0.4	4	7	6	3	0.0	—	—
Days with low ≤ 0°C (days)	26	22	17	4	0.1	—	—	—	—	2	13	23
Days with snowfall ≥ 2.5 cm (days)	2	1	0.5	—	—	—	—	—	—	0.0	0.1	1

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	12	10	11	12	13	11
Days with high ≥ 32°C (days)	—	—	—	—	0.4	4
Days with low ≤ 0°C (days)	26	22	17	4	0.1	—
Days with snowfall ≥ 2.5 cm (days)	2	1	0.5	—	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	10	8	7	9	9	11
Days with high ≥ 32°C (days)	7	6	3	0.0	—	—
Days with low ≤ 0°C (days)	—	—	—	2	13	23
Days with snowfall ≥ 2.5 cm (days)	—	—	—	0.0	0.1	1

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	71	71	68	66	65	58	53	50	48	56	64	71
Clear days (≤ 30% cloud)	3	3	4	5	5	6	8	10	11	8	6	4
Partly cloudy days (30–70%)	10	9	9	9	9	12	12	12	10	10	7	8
Cloudy days (≥ 70%)	18	17	17	16	16	12	11	9	9	13	16	19
Relative humidity (%)	87	85	82	79	80	79	76	70	68	72	79	86
Wind speed (km/h)	6.9	6.9	6.6	5.8	4.5	3.7	3.3	3.3	3.7	4.3	4.9	5.6

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	71	71	68	66	65	58
Clear days (≤ 30% cloud)	3	3	4	5	5	6
Partly cloudy days (30–70%)	10	9	9	9	9	12
Cloudy days (≥ 70%)	18	17	17	16	16	12
Relative humidity (%)	87	85	82	79	80	79
Wind speed (km/h)	6.9	6.9	6.6	5.8	4.5	3.7

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	53	50	48	56	64	71
Clear days (≤ 30% cloud)	8	10	11	8	6	4
Partly cloudy days (30–70%)	12	12	10	10	7	8
Cloudy days (≥ 70%)	11	9	9	13	16	19
Relative humidity (%)	76	70	68	72	79	86
Wind speed (km/h)	3.3	3.3	3.7	4.3	4.9	5.6

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Bloomington Indiana Univ (NOAA GHCN station USC00120784), about 1 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 →