| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 3° | -5.9° | 98.5mm | 11.5 | 11 |
| February | 5.6° | -4.6° | 77.7mm | 9.7 | 25 |
| March | 11.7° | 0.2° | 99.9mm | 10.8 | 49 |
| April | 18.1° | 6° | 133.1mm | 12.3 | 69 |
| May | 23.4° | 11.8° | 142.7mm | 13.4 | 73 |
| June | 27.8° | 16.7° | 143.4mm | 11.6 | 74 |
| July | 29.5° | 18.4° | 116.4mm | 9.7 | 71 |
| August | 29.4° | 17.8° | 81mm | 7.6 | 75 |
| September | 26.1° | 13.6° | 91.2mm | 7.3 | 85 |
| October | 19.2° | 7.3° | 90.7mm | 9.2 | 79 |
| November | 11.8° | 1.3° | 90.3mm | 8.7 | 55 |
| December | 5.5° | -3° | 91.8mm | 11.5 | 23 |
January in Bloomington averages a daily high of 3°C with nights around -5.9°C. Expect roughly 11.5 wet days totalling 98.5mm. A hard month to visit for comfort alone.
February in Bloomington averages a daily high of 5.6°C with nights around -4.6°C. Expect roughly 9.7 wet days totalling 77.7mm. A hard month to visit for comfort alone.
March in Bloomington averages a daily high of 11.7°C with nights around 0.2°C. Expect roughly 10.8 wet days totalling 99.9mm. Demanding conditions — pack for it and plan indoor options.
April in Bloomington averages a daily high of 18.1°C with nights around 6°C. Expect roughly 12.3 wet days totalling 133.1mm. Generally workable, with some weather to plan around.
May in Bloomington averages a daily high of 23.4°C with nights around 11.8°C. Expect roughly 13.4 wet days totalling 142.7mm. Generally workable, with some weather to plan around.
June in Bloomington averages a daily high of 27.8°C with nights around 16.7°C. Expect roughly 11.6 wet days totalling 143.4mm. Generally workable, with some weather to plan around.
July in Bloomington averages a daily high of 29.5°C with nights around 18.4°C. Expect roughly 9.7 wet days totalling 116.4mm. Generally workable, with some weather to plan around.
August in Bloomington averages a daily high of 29.4°C with nights around 17.8°C. Expect roughly 7.6 wet days totalling 81mm. Comfortable conditions for being outdoors all day.
September in Bloomington averages a daily high of 26.1°C with nights around 13.6°C. Expect roughly 7.3 wet days totalling 91.2mm. Comfortable conditions for being outdoors all day.
October in Bloomington averages a daily high of 19.2°C with nights around 7.3°C. Expect roughly 9.2 wet days totalling 90.7mm. Comfortable conditions for being outdoors all day.
November in Bloomington averages a daily high of 11.8°C with nights around 1.3°C. Expect roughly 8.7 wet days totalling 90.3mm. Generally workable, with some weather to plan around.
December in Bloomington averages a daily high of 5.5°C with nights around -3°C. Expect roughly 11.5 wet days totalling 91.8mm. A hard month to visit for comfort alone.
Each month scores out of 100. It starts at 100 and loses points for daytime highs outside a 20–27°C band, for wet days, and for nights below 2°C. Nothing else is weighted in — no crowd data, no prices, no opinion. Bloomington peaks at 85.
Based on 30 years of records, September–October scores highest for comfort in Bloomington, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 29.5°C.
June is the wettest, averaging 143.4mm of rain across roughly 11.6 wet days.
January is the coolest month, with average daily highs around 3°C.