Mississauga is 1.8°C (3.2°F) warmer by day, Mississauga has 7.2°C (13°F) warmer nights, Mississauga gets 161 mm (6.3 in) more rain a year.
Calgary is at its warmest in July and coolest in December, while Mississauga peaks in July and bottoms out in January. Month for month, Mississauga is the warmer of the two in 12 of 12 months.
Mississauga is the wetter of the two, collecting 685 mm (27 in) of rain a year against 524 mm (20.6 in) in Calgary. The most comfortable time to visit is June, July and August in Calgary and July, August and September in Mississauga.
| Calgary | Metric | Mississauga |
|---|---|---|
| 🌡️ Temperature | ||
| 9.6°C | 🌡️Average daytime high | 11.4°C |
| -1.8°C | 🌙Average nighttime low | 5.4°C |
| July | 🔥Hottest month | July |
| December | ❄️Coldest month | January |
| 🌧️ Rain | ||
| 524 mm | 🌧️Annual rainfall | 685 mm |
| June | ☔Wettest month | July |
| January | 🏜️Driest month | February |
| 💨 Climate | ||
| 71% | 💧Average humidity | 78% |
| 1.3 m/s | 💨Average wind speed | 4.1 m/s |
Overnight, Calgary typically falls to around -1.8°C (28.8°F) while Mississauga settles near 5.4°C (41.7°F).
Calgary is hottest in July and coldest in December, whereas Mississauga peaks in July and is coolest in January.
Calgary sees the most rain in June and the least in January; Mississauga is wettest in July and driest in February.
Mississauga feels the more humid of the two, averaging 78% relative humidity against 71%.
For Mississauga, the pick of the year is July, August and September.
Month by month, here is the coldest night, the average day and the hottest afternoon each city can expect. Switch Compare to read rainfall, humidity, wind or solar instead, and Period to move between the long-term 45-year average and any single year — the shading is a quick warm-to-cool guide.
| Month | Calgary | Mississauga | ||||
|---|---|---|---|---|---|---|
| Min | Avg | Max | Min | Avg | Max | |
| January | -11.7 | -7.3 | -2.9 | -5.7 | -3.2❄️ | -0.7 |
| February | -11.2 | -6 | -0.9 | -5.7 | -2.9 | -0.1 |
| March | -7.2 | -1.6 | 3.9 | -2.5 | 0.6 | 3.7 |
| April | -3 | 3.2 | 9.3 | 2 | 5.5 | 8.9 |
| May | 2.1 | 8.7 | 15.2 | 7.4 | 11.1 | 14.8 |
| June | 6.4 | 12.7 | 19 | 13.2 | 16.8 | 20.5 |
| July | 9.4 | 16.2🔥 | 22.9 | 17.1 | 20.6🔥 | 24.1 |
| August | 8.9 | 15.8 | 22.6 | 17.1 | 20.4 | 23.6 |
| September | 4.3 | 10.9 | 17.6 | 13.8 | 16.9 | 20 |
| October | -1.2 | 4.6 | 10.3 | 7.9 | 10.7 | 13.4 |
| November | -7 | -2.7 | 1.6 | 2.3 | 4.7 | 7.1 |
| December | -11.8 | -7.7❄️ | -3.5 | -2.3 | -0.1 | 2 |
| Annual Avg | -1.8 | 3.9 | 9.6 | 5.4 | 8.4 | 11.4 |
Min / mean / max temperature (°C). 🔥 marks each city's hottest month, ❄️ its coldest; shading runs cool blue to warm red.
The same figures plotted out, so the shape of a typical year is easier to see than in a grid. Where the two lines run close together Calgary and Mississauga feel alike; where they separate, they are genuinely different places to be.
Hover or tap any point to read the exact figures. Calgary Mississauga
See how Calgary and Mississauga stack up against other cities. Swipe for more.
Choose which city to keep, then search for any other city in our database — we'll build the comparison for you.
Quick answers to the questions people ask most when comparing Calgary and Mississauga — each drawn straight from the climate figures above.
Mississauga is the warmer of the two. It averages daytime highs of 11.4°C (52.5°F) against 9.6°C (49.3°F) in Calgary — roughly 1.8°C (3.2°F) warmer by day. Nights are milder in Mississauga, with average lows of 5.4°C (41.7°F) versus -1.8°C (28.8°F).
Calgary is hottest in July, averaging highs of about 22.9°C (73.3°F), while Mississauga peaks in July at around 24.1°C (75.3°F). That makes Mississauga the hotter of the two at the height of summer.
Calgary gets colder. In its coldest month (December) overnight lows average about -11.8°C (10.8°F), compared with -5.7°C (21.7°F) at the low point of the year in Mississauga.
Mississauga is the wetter city, collecting about 685 mm (27 in) of rain a year versus 524 mm (20.6 in) in Calgary. Calgary is wettest in June and driest in January; Mississauga is wettest in July and driest in February.
Mississauga is the more humid of the two, averaging 78% relative humidity over the year against 71% in Calgary.
The most comfortable months in Calgary are June, July and August, when average temperatures are at their mildest.
Mississauga is at its most pleasant around July, August and September, based on the mildest average temperatures of the year.
Mississauga is the warmer city in all 12 months of the year. The gap is widest in December, about 7.6°C (13.7°F), and narrowest in March, about 2.2°C (4°F).
Both have a similar seasonal range — around 23.9°C (43°F) between the coldest and hottest months — so neither climate is noticeably more extreme than the other.
It depends what matters most to you: choose Mississauga for warmer weather, pick Calgary if you prefer drier conditions and go for Calgary if you want lower humidity. There is no single "better" climate — it comes down to whether you value warmth, dryness or comfort most.
Every figure on this page is calculated from NASA POWER satellite climate data spanning 1981–2025 (45 years). The averages describe the long-term climate of Calgary and Mississauga, not a single year's weather or a short-range forecast.
