| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | -5.1° | -14.7° | 23.6mm | 9.9 | 10 |
| February | -3.5° | -13.4° | 15.7mm | 8.5 | 13 |
| March | 0.4° | -10.3° | 19.7mm | 10.2 | 10 |
| April | 8.8° | -2.6° | 16.5mm | 6.8 | 44 |
| May | 16.4° | 3.4° | 39.7mm | 8.5 | 71 |
| June | 20.3° | 7.7° | 61.9mm | 11.6 | 77 |
| July | 22.3° | 9.6° | 67mm | 12.2 | 76 |
| August | 21.3° | 8.2° | 53.5mm | 10.3 | 79 |
| September | 16.4° | 3.9° | 29.4mm | 8.9 | 71 |
| October | 8.7° | -1.6° | 27.4mm | 9 | 40 |
| November | -0.5° | -9.3° | 25mm | 11 | 8 |
| December | -5.5° | -14.7° | 13.1mm | 8.3 | 13 |
January in Grande Prairie averages a daily high of -5.1°C with nights around -14.7°C. Expect roughly 9.9 wet days totalling 23.6mm. A hard month to visit for comfort alone.
February in Grande Prairie averages a daily high of -3.5°C with nights around -13.4°C. Expect roughly 8.5 wet days totalling 15.7mm. A hard month to visit for comfort alone.
March in Grande Prairie averages a daily high of 0.4°C with nights around -10.3°C. Expect roughly 10.2 wet days totalling 19.7mm. A hard month to visit for comfort alone.
April in Grande Prairie averages a daily high of 8.8°C with nights around -2.6°C. Expect roughly 6.8 wet days totalling 16.5mm. Demanding conditions — pack for it and plan indoor options.
May in Grande Prairie averages a daily high of 16.4°C with nights around 3.4°C. Expect roughly 8.5 wet days totalling 39.7mm. Generally workable, with some weather to plan around.
June in Grande Prairie averages a daily high of 20.3°C with nights around 7.7°C. Expect roughly 11.6 wet days totalling 61.9mm. Comfortable conditions for being outdoors all day.
July in Grande Prairie averages a daily high of 22.3°C with nights around 9.6°C. Expect roughly 12.2 wet days totalling 67mm. Comfortable conditions for being outdoors all day.
August in Grande Prairie averages a daily high of 21.3°C with nights around 8.2°C. Expect roughly 10.3 wet days totalling 53.5mm. Comfortable conditions for being outdoors all day.
September in Grande Prairie averages a daily high of 16.4°C with nights around 3.9°C. Expect roughly 8.9 wet days totalling 29.4mm. Generally workable, with some weather to plan around.
October in Grande Prairie averages a daily high of 8.7°C with nights around -1.6°C. Expect roughly 9 wet days totalling 27.4mm. Demanding conditions — pack for it and plan indoor options.
November in Grande Prairie averages a daily high of -0.5°C with nights around -9.3°C. Expect roughly 11 wet days totalling 25mm. A hard month to visit for comfort alone.
December in Grande Prairie averages a daily high of -5.5°C with nights around -14.7°C. Expect roughly 8.3 wet days totalling 13.1mm. 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. Grande Prairie peaks at 79.
Based on 30 years of records, May–September scores highest for comfort in Grande Prairie, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 22.3°C.
July is the wettest, averaging 67mm of rain across roughly 12.2 wet days.
December is the coolest month, with average daily highs around -5.5°C.