Paris · December · relief from the heat

Coolest places to go from Paris in December

In December, the coolest well-known place within 15 hours of Paris is Rovaniemi, Finland, 14.4 °C cooler than Paris and 0.1 h sun a day, about 6h 42m each way by air. Without flying, it is Klagenfurt, Austria, 6.5 °C cooler than Paris, about 12h 12m each way by train, for about 22× less carbon (27.3 kg CO₂e return against 597 kg).

The 10 coolest places within 15 hours of Paris

Ranked on relief from the heat in December 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, Finland14.4 °C cooler · 0.1 h sun a day · 1.2 mm rain a dayair ≈ 6h 42m · 597 kg CO₂e return
Tromsø, Norway12.6 °C cooler · 0.0 h sun a day · 3.8 mm rain a dayair ≈ 6h 48m · 623 kg CO₂e return
Joensuu, Finland12.5 °C cooler · 0.9 h sun a day · 1.7 mm rain a dayair ≈ 6h 30m · 570 kg CO₂e return
Östersund, Sweden12.4 °C cooler · 0.9 h sun a day · 1.8 mm rain a dayair ≈ 5h 48m · 443 kg CO₂e return
Oulu, Finland12.3 °C cooler · 0.4 h sun a day · mostly dry · sea 0.2 °Cair ≈ 6h 30m · 566 kg CO₂e return
Luleå, Sweden12.0 °C cooler · 0.3 h sun a day · 1.9 mm rain a day · sea 0.8 °Cair ≈ 6h 24m · 550 kg CO₂e return
Umeå, Sweden11.7 °C cooler · 0.9 h sun a day · 2.1 mm rain a day · sea 2.0 °Cair ≈ 6h 6m · 499 kg CO₂e return
Bodø, Norway10.7 °C cooler · 0.0 h sun a day · 7.8 mm rain a day · sea 6.7 °Cair ≈ 6h 24m · 543 kg CO₂e return
Oslo, Norway9.4 °C cooler · 1.8 h sun a day · 1.7 mm rain a dayair ≈ 5h 18m · 338 kg CO₂e return
Erzurum, Turkey9.4 °C cooler · 6.9 h sun a day · mostly dryair ≈ 7h 48m · 807 kg CO₂e return

Without flying

The coolest places the train reaches within 15 hours. Klagenfurt is 6.5 °C cooler for 27.3 kg — about 22× less carbon than flying to Rovaniemi.

Klagenfurt, Austria6.5 °C cooler · 5.3 h sun a day · 2.2 mm rain a dayrail ≈ 12h 12m · 27.3 kg CO₂e return
La Chaux-de-Fonds, Switzerland5.6 °C cooler · 4.0 h sun a day · 5.1 mm rain a dayrail ≈ 6h 12m · 11.4 kg CO₂e return
Suhl, Germany5.2 °C cooler · 1.8 h sun a day · 3.7 mm rain a dayrail ≈ 8h · 18.6 kg CO₂e return
České Budějovice, Czechia5.0 °C cooler · 4.4 h sun a day · 2.3 mm rain a dayrail ≈ 11h 24m · 26.1 kg CO₂e return
Brno, Czechia5.0 °C cooler · 3.2 h sun a day · 2.1 mm rain a dayrail ≈ 13h 36m · 30.7 kg CO₂e return
Ljubljana, Slovenia5.0 °C cooler · 4.6 h sun a day · 2.6 mm rain a dayrail ≈ 12h 48m · 28.5 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 Paris in December within 15 hours is Rovaniemi, 14.4 °C cooler, costing 597 kg CO₂e return. The lowest-carbon option is Charleville-Mézières at 5.9 kg — 101× less carbon, for 12.2 degrees less relief from the heat.

Every destination here is on the efficiency frontier: nowhere else this site covers is both cooler in December 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 Paris. Pick one to compare.

By rail or ferry By air

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

What the 15-hour limit costs: at this budget Porsgrunn can only be reached by air — 311 kg CO₂e, in 5h 12m. Allow up to 24 hours and the train does the same journey for 36.5 kg in 17h 36m — 9× less carbon for 12h 24m more travelling.

December from Paris — 10 destinations on the frontier, 5 without flying.
Destination	How	CO₂e return	Temp	Sun/day	Rain/day	Journey
Charleville-Mézières, France	Rail	5.9 kg	4.4 °C	2.1 h	3.3 mm	4h 24m
Arlon, Belgium	Rail	7.9 kg	3.6 °C	1.8 h	3.0 mm	5h
Pontarlier, France	Rail	10.9 kg	2.1 °C	3.8 h	6.1 mm	5h 18m
La Chaux-de-Fonds, Switzerland	Rail	11.4 kg	1.0 °C	4.0 h	5.1 mm	6h 12m
Klagenfurt, Austria	Rail	27.3 kg	0.1 °C	5.3 h	2.2 mm	12h 12m
Porsgrunn, Norway	Air	311 kg	-1.8 °C	2.3 h	3.2 mm	5h 12m
Drammen, Norway	Air	330 kg	-3.4 °C	2.1 h	2.8 mm	5h 12m
Lillehammer, Norway	Air	366 kg	-6.0 °C	1.9 h	1.9 mm	5h 24m
Tornio, Finland	Air	572 kg	-7.0 °C	0.1 h	1.4 mm	6h 30m
Rovaniemi, Finland	Air	597 kg	-7.8 °C	0.1 h	1.2 mm	6h 42m

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 (366 kg, 12.6 °C cooler) to Tornio (572 kg, 13.6 °C cooler) buys 1.0 °C more relief from the heat for an extra 205 kg — 205 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-MézièresFrance5.9 kg CO₂e return4.4 °C · 2.1 h sun · 4h 24m by railgrey and wet

KlagenfurtAustria27.3 kg CO₂e return0.1 °C · 5.3 h sun · 12h 12m by railcool RovaniemiFinland597 kg CO₂e return-7.8 °C · 0.1 h sun · 6h 42m by aircool

The same month, asked differently

December 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 Paris

December from elsewhere

Photo credits

Charleville-Mézières: Scanné par Claude_villetaneuse, Public domain, via Wikimedia Commons
Klagenfurt: Johann Jaritz, CC BY-SA 4.0, via Wikimedia Commons
Tromsø: Diego Delso, CC BY-SA 4.0, via Wikimedia Commons
Östersund: Lars Falkdalen Lindahl (User:Njaelkies Lea), CC BY-SA 3.0, via Wikimedia Commons
Luleå: Andreas Harnemo, CC BY-SA 3.0, via Wikimedia Commons
Umeå: Jonipoon, CC BY-SA 4.0, via Wikimedia Commons
Bodø: Røed 20:41, 24 July 2006 (UTC), CC BY-SA 2.5, via Wikimedia Commons
Oslo: Jonipoon, CC BY-SA 3.0, via Wikimedia Commons
České Budějovice: Pavel Rychtecký, CC BY 3.0, via Wikimedia Commons
Brno: Harold, CC BY-SA 3.0, via Wikimedia Commons
Ljubljana: Sieglinde Hankele, CC BY-SA 4.0, via Wikimedia Commons

Questions

Where is the coolest place to go from Paris in December?

Rovaniemi, Finland, at 14.4 °C cooler. Reaching it emits 597 kg CO₂e return, travelling 6h 42m each way by air (modelled).

Can I get somewhere cool from Paris in December without flying?

Yes. Klagenfurt reaches 6.5 °C cooler and is reachable by rail or ferry in 12h 12m (modelled), emitting 27.3 kg CO₂e return — though Rovaniemi is cooler still, if you fly.

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

597 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.