| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 0.8° | -6° | 37.9mm | 10 | 13 |
| February | 2.4° | -5.4° | 34.3mm | 8 | 18 |
| March | 8° | -1.3° | 53.3mm | 9.7 | 37 |
| April | 14.7° | 4.1° | 67.9mm | 12.2 | 59 |
| May | 21.2° | 10.3° | 90.4mm | 13.1 | 74 |
| June | 26.7° | 16.2° | 75.1mm | 10 | 80 |
| July | 29.1° | 18.8° | 86.2mm | 10.6 | 70 |
| August | 27.9° | 18.2° | 84.6mm | 9.5 | 77 |
| September | 24.1° | 14.1° | 70.7mm | 8.7 | 83 |
| October | 16.9° | 7.7° | 56.7mm | 10.7 | 69 |
| November | 9.7° | 1.9° | 55.3mm | 9.7 | 47 |
| December | 3.5° | -2.8° | 49.6mm | 11 | 18 |
January in Detroit averages a daily high of 0.8°C with nights around -6°C. Expect roughly 10 wet days totalling 37.9mm. A hard month to visit for comfort alone.
February in Detroit averages a daily high of 2.4°C with nights around -5.4°C. Expect roughly 8 wet days totalling 34.3mm. A hard month to visit for comfort alone.
March in Detroit averages a daily high of 8°C with nights around -1.3°C. Expect roughly 9.7 wet days totalling 53.3mm. Demanding conditions — pack for it and plan indoor options.
April in Detroit averages a daily high of 14.7°C with nights around 4.1°C. Expect roughly 12.2 wet days totalling 67.9mm. Generally workable, with some weather to plan around.
May in Detroit averages a daily high of 21.2°C with nights around 10.3°C. Expect roughly 13.1 wet days totalling 90.4mm. Generally workable, with some weather to plan around.
June in Detroit averages a daily high of 26.7°C with nights around 16.2°C. Expect roughly 10 wet days totalling 75.1mm. Comfortable conditions for being outdoors all day.
July in Detroit averages a daily high of 29.1°C with nights around 18.8°C. Expect roughly 10.6 wet days totalling 86.2mm. Generally workable, with some weather to plan around.
August in Detroit averages a daily high of 27.9°C with nights around 18.2°C. Expect roughly 9.5 wet days totalling 84.6mm. Comfortable conditions for being outdoors all day.
September in Detroit averages a daily high of 24.1°C with nights around 14.1°C. Expect roughly 8.7 wet days totalling 70.7mm. Comfortable conditions for being outdoors all day.
October in Detroit averages a daily high of 16.9°C with nights around 7.7°C. Expect roughly 10.7 wet days totalling 56.7mm. Generally workable, with some weather to plan around.
November in Detroit averages a daily high of 9.7°C with nights around 1.9°C. Expect roughly 9.7 wet days totalling 55.3mm. Demanding conditions — pack for it and plan indoor options.
December in Detroit averages a daily high of 3.5°C with nights around -2.8°C. Expect roughly 11 wet days totalling 49.6mm. 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. Detroit peaks at 83.
Based on 30 years of records, August–September scores highest for comfort in Detroit, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 29.1°C.
May is the wettest, averaging 90.4mm of rain across roughly 13.1 wet days.
January is the coolest month, with average daily highs around 0.8°C.