Climate averages 1991–2020
Bloomington (Indiana), United States weather
by month.
See how the year changes. July has the highest average daily maximum; September has the lowest average monthly rainfall.
Pleasant-weather months by our simple rule: September
Long-term climate patterns, not a forecast for a particular trip.
Across the year Bloomington (Indiana), United States averages a daytime high of 17.1°C and a nighttime low of 8.1°C, with about 1,131 mm of rain on roughly 122 days. July is the warmest month (average high 29.3°C) and January the coolest (3.2°C). May is the wettest month with 130 mm; September is the driest with 73 mm.
Months with pleasant weather by a simple rule (average high between 18°C and 29°C, average low of at least 5°C and at most 8 rain days): September. This looks at temperature and rain only, not humidity, wind, sea temperature or crowds.
The annual picture
A year in Bloomington
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Bloomington (Indiana), United States climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 3.2°C-4.7°C | -4.7°C | 87 | 9.5 | 9.810 h |
| February | 5.7°C-3.3°C | -3.3°C | 74 | 8.5 | 10.711 h |
| March | 11.3°C1.4°C | 1.4°C | 101 | 10.8 | 11.912 h |
| April | 17.6°C7.3°C | 7.3°C | 128 | 12.4 | 13.213 h |
| May | 22.5°C13.0°C | 13.0°C | 130 | 13.4 | 14.314 h |
| June | 27.3°C17.9°C | 17.9°C | 111 | 11.9 | 14.915 h |
| July | 29.3°C19.9°C | 19.9°C | 88 | 11.4 | 14.615 h |
| August | 28.8°C19.3°C | 19.3°C | 79 | 8.9 | 13.714 h |
| September | 25.3°C15.6°C | 15.6°C | 73 | 7.9 | 12.512 h |
| October | 18.5°C9.5°C | 9.5°C | 83 | 8.2 | 11.211 h |
| November | 11.0°C3.2°C | 3.2°C | 92 | 8.9 | 10.110 h |
| December | 5.2°C-1.9°C | -1.9°C | 86 | 10.1 | 9.59 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
Nearby cities
- IndianapolisUnited States · 74 kmHigh 16.3°C · Low 7.4°C · 1,075 mm rain a year
- CarmelUnited States · 97 kmHigh 15.9°C · Low 7.0°C · 1,054 mm rain a year
- FishersUnited States · 98 kmHigh 16.0°C · Low 6.9°C · 1,054 mm rain a year
- LouisvilleUnited States · 121 kmHigh 18.6°C · Low 9.2°C · 1,169 mm rain a year
- Lafayette (Indiana), United StatesUnited States · 142 kmHigh 15.9°C · Low 6.7°C · 1,002 mm rain a year
- MuncieUnited States · 150 kmHigh 15.6°C · Low 6.5°C · 1,032 mm rain a year
- EvansvilleUnited States · 160 kmHigh 19.0°C · Low 10.1°C · 1,173 mm rain a year
- CincinnatiUnited States · 174 kmHigh 17.1°C · Low 7.7°C · 1,087 mm rain a year
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsWhat do the high and low temperatures mean?
We average the daily maximum and daily minimum for each calendar month over 1991–2020. They are not record extremes, a forecast range or temperatures at a fixed time of day.
How is a rain day counted?
A local calendar day (standard time, UTC-5, no daylight saving) with at least 1 mm of total precipitation counts as one rain day. We count these for each year and month, then average across 30 years. The average does not predict which days will be wet.
Where do the numbers come from?
ERA5-Land (temperature) and ERA5 (precipitation) reanalysis from the Copernicus Climate Change Service, read from the Open-Meteo open-data archive. Temperature comes from the 0.1° model cell at 39.20°, -86.50° (5 km from the city centre), adjusted down by 0.1°C for the difference between the city's elevation (243 m) and the cell's (233 m). Rain comes from the 0.25° cell at 39.25°, -86.50°. These are model estimates, not weather-station readings; coast, hills and city streets can differ.
Does this page show sunshine, humidity or sea temperature?
No. The data used here contain air temperature and precipitation only. Daylight hours are calculated from the city's latitude (sunrise to sunset), not measured sunshine.