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Copenhagen · December · relief from the heat

Coolest places to go from Copenhagen in December

In December, the coolest well-known place within 15 hours of Copenhagen is Rovaniemi, Finland, 12.1 °C cooler than Copenhagen and 0.1 h sun a day, about 5h 24m each way by air. Without flying, it is Östersund, Sweden, 10.1 °C cooler than Copenhagen, about 14h 6m each way by train, for about 14× less carbon (24.9 kg CO₂e return against 349 kg).

The 10 coolest places within 15 hours of Copenhagen

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.

  1. Rovaniemi, Finland12.1 °C cooler · 0.1 h sun a day · 1.2 mm rain a dayair ≈ 5h 24m · 349 kg CO₂e return
  2. Tromsø, Norway10.3 °C cooler · 0.0 h sun a day · 3.8 mm rain a dayair ≈ 5h 36m · 399 kg CO₂e return
  3. Joensuu, Finland10.2 °C cooler · 0.9 h sun a day · 1.7 mm rain a dayair ≈ 5h 12m · 312 kg CO₂e return
  4. Östersund, Sweden10.1 °C cooler · 0.9 h sun a day · 1.8 mm rain a dayrail ≈ 14h 6m · 24.9 kg CO₂e return
  5. Oulu, Finland10.0 °C cooler · 0.4 h sun a day · mostly dry · sea 0.2 °Cair ≈ 5h 12m · 315 kg CO₂e return
  6. Luleå, Sweden9.7 °C cooler · 0.3 h sun a day · 1.9 mm rain a day · sea 0.8 °Cair ≈ 5h 6m · 306 kg CO₂e return
  7. Umeå, Sweden9.4 °C cooler · 0.9 h sun a day · 2.1 mm rain a day · sea 2.0 °Crail ≈ 14h 48m · 29.6 kg CO₂e return
  8. Bodø, Norway8.4 °C cooler · 0.0 h sun a day · 7.8 mm rain a day · sea 6.7 °Cair ≈ 5h 12m · 326 kg CO₂e return
  9. Oslo, Norway7.1 °C cooler · 1.8 h sun a day · 1.7 mm rain a dayrail ≈ 9h · 14.3 kg CO₂e return
  10. Erzurum, Turkey7.1 °C cooler · 6.9 h sun a day · mostly dryair ≈ 7h 6m · 688 kg CO₂e return

Without flying

The coolest places the train reaches within 15 hours. Östersund is 10.1 °C cooler for 24.9 kg — about 14× less carbon than flying to Rovaniemi.

  1. Östersund, Sweden10.1 °C cooler · 0.9 h sun a day · 1.8 mm rain a dayrail ≈ 14h 6m · 24.9 kg CO₂e return
  2. Umeå, Sweden9.4 °C cooler · 0.9 h sun a day · 2.1 mm rain a day · sea 2.0 °Crail ≈ 14h 48m · 29.6 kg CO₂e return
  3. Sundsvall, Sweden9.3 °C cooler · 1.5 h sun a day · 1.5 mm rain a day · sea 2.7 °Crail ≈ 12h 18m · 23.4 kg CO₂e return
  4. Falun, Sweden8.2 °C cooler · 1.6 h sun a day · 1.8 mm rain a dayrail ≈ 10h 12m · 17.0 kg CO₂e return
  5. Oslo, Norway7.1 °C cooler · 1.8 h sun a day · 1.7 mm rain a dayrail ≈ 9h · 14.3 kg CO₂e return
  6. Turku, Finland6.4 °C cooler · 1.1 h sun a day · 1.7 mm rain a dayrail ≈ 14h 6m · 23.0 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 Copenhagen in December within 15 hours is Rovaniemi, 12.1 °C cooler, costing 349 kg CO₂e return. The lowest-carbon option is Vaxjo at 5.7 kg — 61× less carbon, for 8.8 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.

VaxjoRovaniemi
Where they are. Solid lines are rail or ferry, dashed are flights, from Copenhagen. Pick one to compare.
Carbon against relief from the heat, December, departing Copenhagen. Journeys of up to 15 hours each way.8 destinations. Lowest carbon Vaxjo at 5.7 kilograms and 3.3 °C cooler; best for relief from the heat Rovaniemi at 349 kilograms and 12.1 °C cooler. Vaxjo · 5.7 kgLillehammer · 18.2 kgTornio · 324 kgRovaniemi · 349 kg

By rail or ferry By air

Carbon against relief from the heat, December, departing Copenhagen. Journeys of up to 15 hours each way.
December from Copenhagen — 8 destinations on the frontier, 6 without flying.
DestinationHowCO₂e returnTempSun/dayRain/dayJourney
Vaxjo, SwedenRail5.7 kg1.0 °C1.3 h1.7 mm4h 48m
Skövde, SwedenRail9.2 kg-0.1 °C1.5 h2.1 mm6h 30m
Karlstad, SwedenRail12.3 kg-1.5 °C2.1 h2.3 mm8h
Karlskoga, SwedenRail12.5 kg-2.0 °C1.6 h2.7 mm8h 6m
Drammen, NorwayRail14.0 kg-3.4 °C2.1 h2.8 mm8h 48m
Lillehammer, NorwayRail18.2 kg-6.0 °C1.9 h1.9 mm10h 54m
Tornio, FinlandAir324 kg-7.0 °C0.1 h1.4 mm5h 12m
Rovaniemi, FinlandAir349 kg-7.8 °C0.1 h1.2 mm5h 24m

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 (18.2 kg, 10.3 °C cooler) to Tornio (324 kg, 11.3 °C cooler) buys 1.0 °C more relief from the heat for an extra 306 kg — 306 kg of CO₂e per degree. That single step is the most expensive relief from the heat on the whole curve.

The pick of them

Vaxjo, SwedenVaxjoSweden5.7 kg CO₂e return1.0 °C · 1.3 h sun · 4h 48m by railcoolLillehammer, NorwayLillehammerNorway18.2 kg CO₂e return-6.0 °C · 1.9 h sun · 10h 54m by railcoolRovaniemiFinland349 kg CO₂e return-7.8 °C · 0.1 h sun · 5h 24m 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 Copenhagen

December from elsewhere

Photo credits

Questions

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

Rovaniemi, Finland, at 12.1 °C cooler. Reaching it emits 349 kg CO₂e return, travelling 5h 24m each way by air (modelled).

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

Yes. Lillehammer reaches 10.3 °C cooler and is reachable by rail or ferry in 10h 54m (modelled), emitting 18.2 kg CO₂e return — though Rovaniemi is cooler still, if you fly.

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

349 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.