London · January · relief from the heat

Coolest places to go from London in January

In January, the coolest well-known place within 15 hours of London is Rovaniemi, Finland, 13.7 °C cooler than London and 0.7 h sun a day, about 6h 24m each way by air. Without flying, it is La Chaux-de-Fonds, Switzerland, 4.8 °C cooler than London, about 10h 30m each way by train, for about 27× less carbon (20.7 kg CO₂e return against 552 kg).

The 10 coolest places within 15 hours of London

Ranked on relief from the heat in January alone, among well-known places (a Wikivoyage travel guide and at least 40,000 Wikipedia readers a year), one per area and at most three per country. The carbon is shown, not used to choose: the list further down is the other question, how much relief from the heat each extra kilogram buys.

Rovaniemi, Finland13.7 °C cooler · 0.7 h sun a day · 1.4 mm rain a dayair ≈ 6h 24m · 552 kg CO₂e return
Joensuu, Finland13.0 °C cooler · 1.2 h sun a day · 1.9 mm rain a dayair ≈ 6h 24m · 543 kg CO₂e return
Luleå, Sweden12.7 °C cooler · 1.5 h sun a day · 1.6 mm rain a day · sea 0.1 °Cair ≈ 6h 12m · 505 kg CO₂e return
Oulu, Finland12.5 °C cooler · 1.2 h sun a day · 1.5 mm rain a day · sea -0.1 °Cair ≈ 6h 18m · 526 kg CO₂e return
Umeå, Sweden11.0 °C cooler · 1.7 h sun a day · 2.8 mm rain a day · sea 0.7 °Cair ≈ 5h 54m · 456 kg CO₂e return
Östersund, Sweden10.9 °C cooler · 1.3 h sun a day · 1.5 mm rain a dayair ≈ 5h 36m · 393 kg CO₂e return
Narva, Estonia10.3 °C cooler · 1.3 h sun a day · 1.8 mm rain a dayair ≈ 6h 6m · 495 kg CO₂e return
Tromsø, Norway10.0 °C cooler · 0.0 h sun a day · 5.6 mm rain a dayair ≈ 6h 30m · 565 kg CO₂e return
Oslo, Norway9.9 °C cooler · 2.5 h sun a day · 3.2 mm rain a dayair ≈ 5h · 290 kg CO₂e return
Tartu, Estonia9.5 °C cooler · 1.1 h sun a day · 1.7 mm rain a dayair ≈ 6h · 468 kg CO₂e return

Without flying

The coolest places the train reaches within 15 hours. La Chaux-de-Fonds is 4.8 °C cooler for 20.7 kg — about 27× less carbon than flying to Rovaniemi.

La Chaux-de-Fonds, Switzerland4.8 °C cooler · 3.6 h sun a day · 3.6 mm rain a dayrail ≈ 10h 30m · 20.7 kg CO₂e return
Suhl, Germany4.2 °C cooler · 2.5 h sun a day · 4.1 mm rain a dayrail ≈ 11h 6m · 22.5 kg CO₂e return
Memmingen, Germany3.9 °C cooler · 4.0 h sun a day · 2.3 mm rain a dayrail ≈ 11h 18m · 24.7 kg CO₂e return
Bern, Switzerland3.7 °C cooler · 4.4 h sun a day · 2.9 mm rain a dayrail ≈ 10h 30m · 22.1 kg CO₂e return
Bayreuth, Germany3.7 °C cooler · 3.0 h sun a day · 3.2 mm rain a dayrail ≈ 11h 54m · 24.8 kg CO₂e return
Augsburg, Germany3.2 °C cooler · 3.8 h sun a day · 1.8 mm rain a dayrail ≈ 11h 30m · 25.4 kg CO₂e return

≈ is the model's estimate (air times include getting to and through the airport); ✓ is a rail journey checked against a real timetable, with the date it was checked. Temperatures are historical daily means for 2023–2024, averaged across day and night, so afternoons run warmer.

The low-carbon trade-off

The coolest place you can reach from London in January within 15 hours is Rovaniemi, 13.7 °C cooler, costing 552 kg CO₂e return. The lowest-carbon option is Charleville-Mézières at 11.6 kg — 48× less carbon, for 11.7 degrees less relief from the heat.

Every destination here is on the efficiency frontier: nowhere else this site covers is both cooler in January and lower in carbon. Anything a better option beats outright has been left out.

Where they are. Solid lines are rail or ferry, dashed are flights, from London. Pick one to compare.

By rail or ferry By air

Carbon against relief from the heat, January, departing London. Journeys of up to 15 hours each way.

What the 15-hour limit costs: at this budget Porsgrunn can only be reached by air — 264 kg CO₂e, in 4h 54m. Allow up to 24 hours and the train does the same journey for 30.9 kg in 18h 48m — 9× less carbon for 13h 54m more travelling.

January from London — 9 destinations on the frontier, 3 without flying.
Destination	How	CO₂e return	Temp	Sun/day	Rain/day	Journey
Charleville-Mézières, France	Rail	11.6 kg	3.0 °C	2.8 h	4.2 mm	6h 18m
Lüdenscheid, Germany	Rail	15.9 kg	1.6 °C	2.8 h	5.0 mm	8h 30m
La Chaux-de-Fonds, Switzerland	Rail	20.7 kg	0.2 °C	3.6 h	3.6 mm	10h 30m
Grimstad, Norway	Air	237 kg	-0.9 °C	2.7 h	7.0 mm	4h 48m
Porsgrunn, Norway	Air	264 kg	-4.1 °C	3.0 h	5.3 mm	4h 54m
Oslo, Norway	Air	290 kg	-4.9 °C	2.5 h	3.2 mm	5h
Lillehammer, Norway	Air	314 kg	-7.0 °C	2.6 h	2.1 mm	5h 12m
Luleå, Sweden	Air	505 kg	-7.7 °C	1.5 h	1.6 mm	6h 12m
Rovaniemi, Finland	Air	552 kg	-8.7 °C	0.7 h	1.4 mm	6h 24m

The flights, in practice

The model measures to the town, not to a runway. For the destinations above reached by air, this is the nearest airport, how far it is, and whether a direct flight from London is listed on the airport's own destination page (researched 2026-09-15; route existence, not availability on a date). "Not checked" means no destination list was read for that airport.

Airports for the air destinations on this frontier, checked 2026-09-15.
Destination	Airport	From town	Direct from London	Onward
Grimstad, Norway	not researched	—	not checked	—
Porsgrunn, Norway	Sandefjord Torp TRF	55 km	yes STN	Shuttle to Torp station, then train towards Porsgrunn.
Oslo, Norway	Oslo Gardermoen OSL	50 km	yes LGW, LHR, STN	Airport train or regional train to Oslo.
Lillehammer, Norway	Oslo Gardermoen OSL	145 km	yes LGW, LHR, STN	Northbound train from the airport to Lillehammer.
Luleå, Sweden	Luleå LLA	10 km	no	Airport bus or taxi to Luleå.
Rovaniemi, Finland	Rovaniemi RVN	10 km	seasonal LGW — British Airways' 2026–27 winter service begins 4 December 2026.	Airport bus or taxi to central Rovaniemi.

Sources for this table

Porsgrunn: torp.no
Oslo: www.avinor.no
Lillehammer: www.avinor.no
Luleå: www.swedavia.com
Rovaniemi: www.finavia.fi

Warm is not the same as pleasant, which is why sunshine and rainfall are shown alongside temperature. All three are ERA5 monthly means for 2023–2024.

Where the curve breaks

The frontier is gentle until it isn't. Going from Lillehammer (314 kg, 12.0 °C cooler) to Luleå (505 kg, 12.7 °C cooler) buys 0.7 °C more relief from the heat for an extra 191 kg — 273 kg of CO₂e per degree. That single step is the most expensive relief from the heat on the whole curve.

The pick of them

Charleville-MézièresFrance11.6 kg CO₂e return3.0 °C · 2.8 h sun · 6h 18m by railgrey and wet La Chaux-de-FondsSwitzerland20.7 kg CO₂e return0.2 °C · 3.6 h sun · 10h 30m by railgrey and wet RovaniemiFinland552 kg CO₂e return-8.7 °C · 0.7 h sun · 6h 24m by aircool

The same month, asked differently

January answers differently depending on what you are after, and the lists genuinely diverge: the brightest places are not the hottest, and in summer the useful question stops being where is warm at all.

Where to stay in Rovaniemi

Places to stay in Rovaniemi, Finland, on a live map. Prices and availability come from Stay22 and its booking partners.

Search places to stay in Rovaniemi →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.

Other months from London

January from elsewhere

Photo credits

Charleville-Mézières: Scanné par Claude_villetaneuse, Public domain, via Wikimedia Commons
Luleå: Andreas Harnemo, CC BY-SA 3.0, via Wikimedia Commons
Umeå: Jonipoon, CC BY-SA 4.0, via Wikimedia Commons
Östersund: Lars Falkdalen Lindahl (User:Njaelkies Lea), CC BY-SA 3.0, via Wikimedia Commons
Tromsø: Diego Delso, CC BY-SA 4.0, via Wikimedia Commons
Oslo: Jonipoon, CC BY-SA 3.0, via Wikimedia Commons

Questions

Where is the coolest place to go from London in January?

Rovaniemi, Finland, at 13.7 °C cooler. Reaching it emits 552 kg CO₂e return, travelling 6h 24m each way by air (modelled).

Can I get somewhere cool from London in January without flying?

Yes. La Chaux-de-Fonds reaches 4.8 °C cooler and is reachable by rail or ferry in 10h 30m (modelled), emitting 20.7 kg CO₂e return — though Rovaniemi is cooler still, if you fly.

How much carbon does a return trip from London to Rovaniemi produce?

552 kg CO₂e for one person, return, by air. That uses the UK Government's 2026 conversion factors, including radiative forcing for flights.

Carbon uses UK Government (DESNZ/DEFRA) 2026 conversion factors applied to great-circle distance, with radiative forcing included for flights. Rail journey times are modelled estimates, not timetabled services. Full method · download the data.