| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | -0.1° | -11.6° | 7.8mm | 5 | 20 |
| February | -0.8° | -12.3° | 12.1mm | 6 | 18 |
| March | 3.6° | -8.1° | 15mm | 7 | 19 |
| April | 10.4° | -2.2° | 24.3mm | 7.2 | 49 |
| May | 16.7° | 3.3° | 44.7mm | 8.9 | 72 |
| June | 20.3° | 7.9° | 92.8mm | 12.3 | 75 |
| July | 24.4° | 10.6° | 46.9mm | 9.8 | 80 |
| August | 23.6° | 9.3° | 46.4mm | 10.2 | 80 |
| September | 18.7° | 5° | 29.3mm | 7.6 | 81 |
| October | 11.5° | -1.3° | 19.4mm | 6.2 | 55 |
| November | 4.3° | -7.6° | 11.5mm | 5.6 | 24 |
| December | -0.5° | -12.2° | 12.5mm | 7.1 | 16 |
January in Calgary averages a daily high of -0.1°C with nights around -11.6°C. Expect roughly 5 wet days totalling 7.8mm. A hard month to visit for comfort alone.
February in Calgary averages a daily high of -0.8°C with nights around -12.3°C. Expect roughly 6 wet days totalling 12.1mm. A hard month to visit for comfort alone.
March in Calgary averages a daily high of 3.6°C with nights around -8.1°C. Expect roughly 7 wet days totalling 15mm. A hard month to visit for comfort alone.
April in Calgary averages a daily high of 10.4°C with nights around -2.2°C. Expect roughly 7.2 wet days totalling 24.3mm. Demanding conditions — pack for it and plan indoor options.
May in Calgary averages a daily high of 16.7°C with nights around 3.3°C. Expect roughly 8.9 wet days totalling 44.7mm. Generally workable, with some weather to plan around.
June in Calgary averages a daily high of 20.3°C with nights around 7.9°C. Expect roughly 12.3 wet days totalling 92.8mm. Comfortable conditions for being outdoors all day.
July in Calgary averages a daily high of 24.4°C with nights around 10.6°C. Expect roughly 9.8 wet days totalling 46.9mm. Comfortable conditions for being outdoors all day.
August in Calgary averages a daily high of 23.6°C with nights around 9.3°C. Expect roughly 10.2 wet days totalling 46.4mm. Comfortable conditions for being outdoors all day.
September in Calgary averages a daily high of 18.7°C with nights around 5°C. Expect roughly 7.6 wet days totalling 29.3mm. Comfortable conditions for being outdoors all day.
October in Calgary averages a daily high of 11.5°C with nights around -1.3°C. Expect roughly 6.2 wet days totalling 19.4mm. Generally workable, with some weather to plan around.
November in Calgary averages a daily high of 4.3°C with nights around -7.6°C. Expect roughly 5.6 wet days totalling 11.5mm. A hard month to visit for comfort alone.
December in Calgary averages a daily high of -0.5°C with nights around -12.2°C. Expect roughly 7.1 wet days totalling 12.5mm. 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. Calgary peaks at 81.
Based on 30 years of records, June–September scores highest for comfort in Calgary, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 24.4°C.
June is the wettest, averaging 92.8mm of rain across roughly 12.3 wet days.
February is the coolest month, with average daily highs around -0.8°C.