Cergy
Reaching Cergy from Brussels emits 7.6 kg CO₂e return by rail (5h 30m each way) against 65.2 kg by air — 9× the carbon. It averages 19.7 °C in August and 4.8 °C in January.
Getting there
| From | Distance | By rail | Rail time | By air | Air time |
|---|---|---|---|---|---|
| Amsterdam | 421 km | 12.4 kg | 7h 48m | 106 kg | 4h 6m |
| Barcelona | 850 km | 25.1 kg | 13h 36m | 214 kg | 4h 36m |
| Berlin | 885 km | 26.1 kg | 14h 6m | 223 kg | 4h 42m |
| Birmingham | 474 km | 22.4 kg | 8h 36m | 119 kg | 4h 6m |
| Bristol | 427 km | 23.1 kg | 8h 42m | 108 kg | 4h 6m |
| Brussels | 259 km | 7.6 kg | 5h 30m | 65.2 kg | 3h 48m |
| Cardiff | 462 km | 26.3 kg | 9h 12m | 116 kg | 4h 6m |
| Copenhagen | 1,024 km | 30.2 kg | 16h | 258 kg | 4h 54m |
| Dublin | 751 km | — | — | 189 kg | 4h 30m |
| Edinburgh | 847 km | 52.2 kg | 13h 36m | 213 kg | 4h 36m |
| Frankfurt | 491 km | 14.5 kg | 8h 42m | 124 kg | 4h 12m |
| Glasgow | 871 km | 54.0 kg | 13h 54m | 219 kg | 4h 42m |
| Leeds | 586 km | 31.2 kg | 10h | 147 kg | 4h 18m |
| Lisbon | 1,454 km | 42.9 kg | 21h 54m | 366 kg | 5h 24m |
| Liverpool | 600 km | 32.4 kg | 10h 12m | 151 kg | 4h 18m |
| London | 316 km | 9.3 kg | 6h 18m | 79.5 kg | 3h 54m |
| Madrid | 1,061 km | 31.3 kg | 16h 30m | 267 kg | 4h 54m |
| Manchester | 578 km | 30.4 kg | 9h 54m | 145 kg | 4h 18m |
| Milan | 667 km | 19.7 kg | 11h 6m | 168 kg | 4h 24m |
| Munich | 705 km | 20.8 kg | 11h 42m | 177 kg | 4h 24m |
| Newcastle | 707 km | 41.3 kg | 11h 48m | 178 kg | 4h 24m |
| Nottingham | 490 km | 23.4 kg | 8h 42m | 123 kg | 4h 12m |
| Oslo | 1,330 km | 39.3 kg | 20h 12m | 335 kg | 5h 18m |
| Prague | 897 km | 26.5 kg | 14h 18m | 226 kg | 4h 42m |
| Rome | 1,135 km | 33.5 kg | 17h 30m | 286 kg | 5h |
| Sheffield | 542 km | 27.6 kg | 9h 24m | 136 kg | 4h 12m |
| Southampton | 324 km | 18.3 kg | 7h 54m | 81.5 kg | 3h 54m |
| Stockholm | 1,539 km | 45.4 kg | 23h 6m | 387 kg | 5h 36m |
| Vienna | 1,053 km | 31.1 kg | 16h 24m | 265 kg | 4h 54m |
| Warsaw | 1,377 km | 40.6 kg | 20h 48m | 347 kg | 5h 18m |
| Zurich | 514 km | 15.2 kg | 9h | 129 kg | 4h 12m |
The year in Cergy
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temp °C | 4.8 | 7.0 | 8.6 | 10.1 | 14.2 | 18.3 | 19.5 | 19.7 | 17.5 | 13.7 | 8.4 | 6.6 |
| Sun h/day | 3.9 | 4.0 | 6.7 | 8.9 | 10.8 | 12.5 | 11.3 | 10.5 | 8.7 | 6.2 | 4.2 | 2.5 |
| Rain mm/day | 2.4 | 2.0 | 3.3 | 2.7 | 2.8 | 2.6 | 1.9 | 3.7 | 3.4 | 3.5 | 2.6 | 1.9 |
When to go
Cergy is warmest in August at 19.7 °C but brightest in June, averaging 12.5 hours of sun a day — the two do not always coincide, which is worth knowing before booking. Its coldest is January at 4.8 °C.
Staying there
A hotel room in France emits about 6.7 kg CO₂e per night under UK Government 2026 factors, so a week adds roughly 47 kg — about 6.2× the carbon of getting there by rail from Brussels.
How busy it gets
Val-d’Oise records 3.4 overnight stays per resident a year (4,468,470 nights in 2025). Comparatively quiet by European standards.
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 Cergy
Places to stay in Cergy, France, on a live map. Prices and availability come from Stay22 and its booking partners.
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.