London is 4.7°C (8.5°F) warmer by day, London has 8°C (14.4°F) warmer nights, London gets 181 mm (7.1 in) more rain a year.
Calgary is at its warmest in July and coolest in December, while London peaks in July and bottoms out in February. Month for month, London is the warmer of the two in 12 of 12 months.
London is the wetter of the two, collecting 705 mm (27.8 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 June, July and August in London.
| Calgary | Metric | London |
|---|---|---|
| 🌡️ Temperature | ||
| 9.6°C | 🌡️Average daytime high | 14.3°C |
| -1.8°C | 🌙Average nighttime low | 6.2°C |
| July | 🔥Hottest month | July |
| December | ❄️Coldest month | February |
| 🌧️ Rain | ||
| 524 mm | 🌧️Annual rainfall | 705 mm |
| June | ☔Wettest month | October |
| January | 🏜️Driest month | April |
| 💨 Climate | ||
| 71% | 💧Average humidity | 85% |
| 1.3 m/s | 💨Average wind speed | 3.4 m/s |
Overnight, Calgary typically falls to around -1.8°C (28.8°F) while London settles near 6.2°C (43.2°F).
Calgary is hottest in July and coldest in December, whereas London peaks in July and is coolest in February.
Calgary sees the most rain in June and the least in January; London is wettest in October and driest in April.
London feels the more humid of the two, averaging 85% relative humidity against 71%.
For London, the pick of the year is June, July and August.
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 | London | ||||
|---|---|---|---|---|---|---|
| Min | Avg | Max | Min | Avg | Max | |
| January | -11.7 | -7.3 | -2.9 | 1.3 | 4❄️ | 6.7 |
| February | -11.2 | -6 | -0.9 | 1.2 | 4.4 | 7.5 |
| March | -7.2 | -1.6 | 3.9 | 2.5 | 6.5 | 10.4 |
| April | -3 | 3.2 | 9.3 | 4 | 8.7 | 13.3 |
| May | 2.1 | 8.7 | 15.2 | 7.1 | 11.9 | 16.7 |
| June | 6.4 | 12.7 | 19 | 10 | 14.9 | 19.9 |
| July | 9.4 | 16.2🔥 | 22.9 | 12.3 | 17.4🔥 | 22.4 |
| August | 8.9 | 15.8 | 22.6 | 12.3 | 17.3 | 22.4 |
| September | 4.3 | 10.9 | 17.6 | 10.1 | 14.8 | 19.5 |
| October | -1.2 | 4.6 | 10.3 | 7.5 | 11.3 | 15.1 |
| November | -7 | -2.7 | 1.6 | 4.3 | 7.2 | 10.2 |
| December | -11.8 | -7.7❄️ | -3.5 | 2.4 | 4.9 | 7.3 |
| Annual Avg | -1.8 | 3.9 | 9.6 | 6.3 | 10.3 | 14.3 |
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 London feel alike; where they separate, they are genuinely different places to be.
Hover or tap any point to read the exact figures. Calgary London
See how Calgary and London 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 London — each drawn straight from the climate figures above.
London is the warmer of the two. It averages daytime highs of 14.3°C (57.7°F) against 9.6°C (49.3°F) in Calgary — roughly 4.7°C (8.5°F) warmer by day. Nights are milder in London, with average lows of 6.2°C (43.2°F) versus -1.8°C (28.8°F).
Calgary is hottest in July, averaging highs of about 22.9°C (73.3°F), while London peaks in July at around 22.4°C (72.4°F). That makes Calgary 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 1.2°C (34.2°F) at the low point of the year in London.
London is the wetter city, collecting about 705 mm (27.8 in) of rain a year versus 524 mm (20.6 in) in Calgary. Calgary is wettest in June and driest in January; London is wettest in October and driest in April.
London is the more humid of the two, averaging 85% 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.
London is at its most pleasant around June, July and August, based on the mildest average temperatures of the year.
London is the warmer city in all 12 months of the year. The gap is widest in December, about 12.6°C (22.7°F), and narrowest in July, about 1.2°C (2.2°F).
Calgary has the bigger seasonal swing, about 23.9°C (43°F) between its coldest and hottest months versus 13.4°C (24.1°F) in London — so London has the steadier, more even climate.
It depends what matters most to you: choose London 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 London, not a single year's weather or a short-range forecast.
