Sion
Reaching Sion from London emits 23.7 kg CO₂e return by rail (10h 54m each way) against 202 kg by air — 9× the carbon. It averages 22.8 °C in August and 3.3 °C in January.
Sion (German: Sitten) is the capital of the canton of Valais in Switzerland. — Wikivoyage, CC BY-SA 4.0
When to go: Sion is warmest in August (22.8 °C), sunniest in July (13.0 h a day); coldest in January (3.3 °C). Month by month
Getting there
| From | Distance | By rail | Rail time | By air | Air time |
|---|---|---|---|---|---|
| Amsterdam | 706 km | 20.8 kg | 11h 18m | 178 kg | 4h 24m |
| Barcelona | 680 km | 20.1 kg | 10h 30m | 171 kg | 4h 24m |
| Berlin | 825 km | 24.4 kg | 11h 54m | 208 kg | 4h 36m |
| Birmingham | 964 km | 36.7 kg | 13h 36m | 243 kg | 4h 48m |
| Bristol | 930 km | 37.4 kg | 13h 54m | 234 kg | 4h 42m |
| Brussels | 560 km | 16.5 kg | 9h 18m | 141 kg | 4h 12m |
| Cardiff | 966 km | 40.7 kg | 14h 12m | 243 kg | 4h 48m |
| Copenhagen | 1,111 km | 32.8 kg | 17h 42m | 280 kg | 5h |
| Dublin | 1,253 km | — | — | 315 kg | 5h 12m |
| Edinburgh | 1,305 km | 66.6 kg | 16h 36m | 328 kg | 5h 12m |
| Frankfurt | 443 km | 13.1 kg | 7h 6m | 112 kg | 4h 6m |
| Glasgow | 1,341 km | 68.3 kg | 16h 48m | 337 kg | 5h 18m |
| Leeds | 1,053 km | 45.5 kg | 14h 30m | 265 kg | 4h 54m |
| Lisbon | 1,585 km | 46.8 kg | 24h 54m | 399 kg | 5h 36m |
| Liverpool | 1,088 km | 46.7 kg | 14h 30m | 274 kg | 5h |
| London | 802 km | 23.7 kg | 10h 54m | 202 kg | 4h 36m |
| Madrid | 1,102 km | 32.5 kg | 14h 6m | 277 kg | 5h |
| Manchester | 1,058 km | 44.7 kg | 14h 24m | 266 kg | 4h 54m |
| Milan | 165 km | 4.9 kg | 4h 24m | 41.6 kg | 3h 42m |
| Munich | 383 km | 11.3 kg | 7h 30m | 96.4 kg | 4h |
| Newcastle | 1,158 km | 55.6 kg | 15h 6m | 291 kg | 5h |
| Nottingham | 966 km | 37.8 kg | 14h | 243 kg | 4h 48m |
| Oslo | 1,538 km | 45.4 kg | 24h 12m | 387 kg | 5h 36m |
| Paris | 476 km | 14.0 kg | 6h 30m | 120 kg | 4h 6m |
| Prague | 677 km | 20.0 kg | 11h 48m | 170 kg | 4h 24m |
| Rome | 634 km | 18.7 kg | 7h 54m | 159 kg | 4h 18m |
| Sheffield | 1,015 km | 41.9 kg | 14h 18m | 255 kg | 4h 54m |
| Southampton | 827 km | 32.6 kg | 13h 36m | 208 kg | 4h 36m |
| Stockholm | 1,621 km | 47.8 kg | 23h 6m | 408 kg | 5h 42m |
| Vienna | 715 km | 21.1 kg | 11h 42m | 180 kg | 4h 30m |
| Warsaw | 1,192 km | 35.2 kg | 19h 12m | 300 kg | 5h 6m |
| Zurich | 156 km | 4.6 kg | 3h 48m | 39.2 kg | 3h 42m |
The year in Sion
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temp °C | 3.3 | 6.4 | 7.1 | 9.2 | 14.6 | 19.9 | 22.5 | 22.8 | 17.8 | 14.4 | 6.9 | 3.7 |
| Sun h/day | 5.9 | 7.8 | 7.5 | 9.1 | 10.3 | 12.0 | 13.0 | 11.6 | 9.6 | 7.6 | 5.8 | 5.2 |
| Rain mm/day | 3.2 | 1.7 | 6.7 | 4.1 | 5.6 | 4.2 | 2.9 | 2.3 | 3.7 | 3.7 | 7.0 | 7.0 |
When to go
Sion is warmest in August at 22.8 °C but brightest in July, averaging 13.0 hours of sun a day — the two do not always coincide, which is worth knowing before booking. Its coldest is January at 3.3 °C.
On these lists
Three months worth booking
The same year of measurements, decided rather than tabulated. Each opens the map below on dates in that month.
Staying there
A hotel room in Switzerland emits about 6.6 kg CO₂e per night under UK Government 2026 factors — a country average per occupied room, not this or any particular hotel. 7 nights in one room adds roughly 46 kg — about 10.0× the carbon of one person getting there by rail from Zurich. Two sharing the room halve that share each; the journey does not halve.
How busy it gets
Valais / Wallis records 23.4 overnight stays per resident a year (8,697,998 nights in 2025). A well-visited region, busy in season but not overwhelmed.
Eurostat, nights spent at tourist accommodation by NUTS 3 region, against resident population. Shown for context only — it plays no part in which destinations appear or in what order. Eurostat does not cover the United Kingdom after 2016, nor North Africa or the Levant at all, so this figure is absent for roughly a third of the destinations here.
Where to stay in Sion
Places to stay in Sion, Switzerland, on a live map. Prices and availability come from Stay22 and its booking partners.
Search places to stay in Sion →Opens the booking search in a new tab. Same partners as the map below.
Affiliate disclosure. A booking made through this map may earn 0xCarbon a commission, at no extra cost to you. It changes nothing above it: the emissions figures come from UK Government conversion factors and are computed before anyone is paid anything.See the method.
Distances are great-circle. Rail assumes international rail at 0.01135 kg CO₂e per passenger-km with a 1.3× track detour allowance; flights use 0.12576 kg per passenger-km including radiative forcing. Journey times are modelled, not timetabled. Full method.