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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).
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 figuresClear vs cloudy days
Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day countsBloomington 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 (m/s) | 1.9 | 1.9 | 1.8 | 1.6 | 1.2 | 1.0 | 0.9 | 0.9 | 1.0 | 1.2 | 1.4 | 1.6 |
| 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 (m/s) | 1.9 | 1.9 | 1.8 | 1.6 | 1.2 | 1.0 |
| 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 (m/s) | 0.9 | 0.9 | 1.0 | 1.2 | 1.4 | 1.6 |
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.