Boulogne-sur-Mer
Reaching Boulogne-sur-Mer from Brussels emits 5.7 kg CO₂e return by rail (4h 12m each way) against 48.5 kg by air — 9× the carbon. It averages 18.1 °C in August and 5.9 °C in January.
Boulogne-sur-Mer or Boulogne is a city and port in the Côte d'Opale region of Hauts-de-France. — Wikivoyage, CC BY-SA 4.0
When to go: Boulogne-sur-Mer is warmest in August (18.1 °C), sunniest in June (13.0 h a day); coldest in January (5.9 °C). Month by month
Getting there
| From | Distance | By rail | Rail time | By air | Air time |
|---|---|---|---|---|---|
| Amsterdam | 291 km | 8.6 kg | 6h 12m | 73.3 kg | 3h 54m |
| Barcelona | 1,039 km | 30.7 kg | 12h 12m | 261 kg | 4h 54m |
| Berlin | 838 km | 24.7 kg | 12h 18m | 211 kg | 4h 36m |
| Birmingham | 311 km | 17.5 kg | 8h 18m | 78.3 kg | 3h 54m |
| Bristol | 305 km | 18.2 kg | 8h 36m | 76.7 kg | 3h 54m |
| Brussels | 193 km | 5.7 kg | 4h 12m | 48.5 kg | 3h 48m |
| Cardiff | 345 km | 21.4 kg | 8h 54m | 86.8 kg | 4h |
| Copenhagen | 912 km | 26.9 kg | 15h 12m | 229 kg | 4h 42m |
| Dublin | 611 km | — | — | 154 kg | 4h 18m |
| Edinburgh | 663 km | 47.3 kg | 11h 18m | 167 kg | 4h 24m |
| Frankfurt | 505 km | 14.9 kg | 8h 18m | 127 kg | 4h 12m |
| Glasgow | 692 km | 49.1 kg | 11h 30m | 174 kg | 4h 24m |
| Leeds | 404 km | 26.3 kg | 9h 12m | 102 kg | 4h |
| Lisbon | 1,579 km | 46.6 kg | 24h 36m | 397 kg | 5h 36m |
| Liverpool | 433 km | 27.4 kg | 9h 12m | 109 kg | 4h 6m |
| Madrid | 1,218 km | 35.9 kg | 15h 48m | 306 kg | 5h 6m |
| Manchester | 404 km | 25.5 kg | 9h 6m | 102 kg | 4h |
| Milan | 811 km | 23.9 kg | 12h 30m | 204 kg | 4h 36m |
| Munich | 775 km | 22.9 kg | 11h 12m | 195 kg | 4h 30m |
| Newcastle | 520 km | 36.4 kg | 9h 48m | 131 kg | 4h 12m |
| Nottingham | 312 km | 18.5 kg | 8h 42m | 78.5 kg | 3h 54m |
| Oslo | 1,171 km | 34.6 kg | 18h 54m | 295 kg | 5h 6m |
| Paris | 215 km | 6.3 kg | 4h 36m | 54.0 kg | 3h 48m |
| Prague | 909 km | 26.8 kg | 15h 6m | 229 kg | 4h 42m |
| Rome | 1,288 km | 38.0 kg | 16h 30m | 324 kg | 5h 12m |
| Sheffield | 363 km | 22.7 kg | 9h | 91.3 kg | 4h |
| Southampton | 213 km | 13.4 kg | 8h 18m | 53.6 kg | 3h 48m |
| Stockholm | 1,413 km | 41.7 kg | 20h 24m | 355 kg | 5h 24m |
| Vienna | 1,101 km | 32.5 kg | 16h 18m | 277 kg | 5h |
| Warsaw | 1,350 km | 39.8 kg | 19h 48m | 340 kg | 5h 18m |
| Zurich | 628 km | 18.5 kg | 9h 36m | 158 kg | 4h 18m |
The year in Boulogne-sur-Mer
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temp °C | 5.9 | 7.6 | 8.2 | 9.5 | 12.8 | 16.2 | 17.6 | 18.1 | 17.3 | 13.8 | 9.5 | 8.1 |
| Sun h/day | 4.4 | 4.4 | 6.0 | 9.2 | 11.4 | 13.0 | 11.4 | 11.2 | 8.7 | 6.4 | 3.6 | 2.8 |
| Rain mm/day | 4.3 | 3.9 | 4.2 | 3.6 | 2.4 | 1.0 | 3.2 | 3.2 | 3.6 | 5.1 | 6.0 | 3.8 |
| Sea °C | 9.9 | 8.4 | 8.7 | 10.2 | 12.3 | 15.3 | 17.6 | 19.1 | 18.9 | 16.8 | 14.1 | 11.0 |
When to go
Boulogne-sur-Mer is warmest in August at 18.1 °C but brightest in June, 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 5.9 °C.
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 France emits about 6.7 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 47 kg — about 8.2× the carbon of one person getting there by rail from Brussels. Two sharing the room halve that share each; the journey does not halve.
How busy it gets
Pas-de-Calais records 2.9 overnight stays per resident a year (4,185,081 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 Boulogne-sur-Mer
Places to stay in Boulogne-sur-Mer, France, on a live map. Prices and availability come from Stay22 and its booking partners.
Search places to stay in Boulogne-sur-Mer →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.