| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | -8.6° | -17.8° | 11.9mm | 7.2 | 16 |
| February | -6.2° | -16.4° | 14.4mm | 6.6 | 17 |
| March | 1.2° | -8.7° | 23.9mm | 6.8 | 16 |
| April | 10.8° | -0.7° | 37.8mm | 8.3 | 50 |
| May | 19.1° | 6.4° | 80.3mm | 11.2 | 75 |
| June | 25° | 13° | 99.8mm | 12.1 | 76 |
| July | 27.4° | 15.3° | 85.4mm | 9.7 | 79 |
| August | 26.4° | 13.9° | 76.6mm | 9.1 | 82 |
| September | 21.6° | 9.1° | 59.3mm | 8.8 | 82 |
| October | 12.4° | 1.8° | 53.4mm | 8.7 | 58 |
| November | 2.4° | -6.5° | 19.7mm | 6.5 | 19 |
| December | -5.7° | -14.2° | 21.5mm | 8.3 | 13 |
January in Grand Forks averages a daily high of -8.6°C with nights around -17.8°C. Expect roughly 7.2 wet days totalling 11.9mm. A hard month to visit for comfort alone.
February in Grand Forks averages a daily high of -6.2°C with nights around -16.4°C. Expect roughly 6.6 wet days totalling 14.4mm. A hard month to visit for comfort alone.
March in Grand Forks averages a daily high of 1.2°C with nights around -8.7°C. Expect roughly 6.8 wet days totalling 23.9mm. A hard month to visit for comfort alone.
April in Grand Forks averages a daily high of 10.8°C with nights around -0.7°C. Expect roughly 8.3 wet days totalling 37.8mm. Demanding conditions — pack for it and plan indoor options.
May in Grand Forks averages a daily high of 19.1°C with nights around 6.4°C. Expect roughly 11.2 wet days totalling 80.3mm. Comfortable conditions for being outdoors all day.
June in Grand Forks averages a daily high of 25°C with nights around 13°C. Expect roughly 12.1 wet days totalling 99.8mm. Comfortable conditions for being outdoors all day.
July in Grand Forks averages a daily high of 27.4°C with nights around 15.3°C. Expect roughly 9.7 wet days totalling 85.4mm. Comfortable conditions for being outdoors all day.
August in Grand Forks averages a daily high of 26.4°C with nights around 13.9°C. Expect roughly 9.1 wet days totalling 76.6mm. Comfortable conditions for being outdoors all day.
September in Grand Forks averages a daily high of 21.6°C with nights around 9.1°C. Expect roughly 8.8 wet days totalling 59.3mm. Comfortable conditions for being outdoors all day.
October in Grand Forks averages a daily high of 12.4°C with nights around 1.8°C. Expect roughly 8.7 wet days totalling 53.4mm. Generally workable, with some weather to plan around.
November in Grand Forks averages a daily high of 2.4°C with nights around -6.5°C. Expect roughly 6.5 wet days totalling 19.7mm. A hard month to visit for comfort alone.
December in Grand Forks averages a daily high of -5.7°C with nights around -14.2°C. Expect roughly 8.3 wet days totalling 21.5mm. 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. Grand Forks peaks at 82.
Based on 30 years of records, May–September scores highest for comfort in Grand Forks, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 27.4°C.
June is the wettest, averaging 99.8mm of rain across roughly 12.1 wet days.
January is the coolest month, with average daily highs around -8.6°C.