0xCarbon
Frankfurt · May · relief from the heat

Coolest places to go from Frankfurt in May

In May, the coolest well-known place within 15 hours of Frankfurt is Tromsø, Norway, 9.3 °C cooler than Frankfurt and 7.0 h sun a day, about 6h 30m each way by air. Without flying, it is La Chaux-de-Fonds, Switzerland, 4.4 °C cooler than Frankfurt, about 6h 6m each way by train, for about 53× less carbon (10.7 kg CO₂e return against 563 kg).

The 10 coolest places within 15 hours of Frankfurt

Ranked on relief from the heat in May 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. Tromsø, Norway9.3 °C cooler · 7.0 h sun a day · 4.9 mm rain a dayair ≈ 6h 30m · 563 kg CO₂e return
  2. Reykjavik, Iceland8.6 °C cooler · 6.4 h sun a day · 5.9 mm rain a day · sea 7.5 °Cair ≈ 6h 42m · 597 kg CO₂e return
  3. Rovaniemi, Finland7.4 °C cooler · 13.4 h sun a day · mostly dryair ≈ 6h 12m · 518 kg CO₂e return
  4. Luleå, Sweden7.3 °C cooler · 14.8 h sun a day · mostly dry · sea 1.5 °Cair ≈ 6h · 475 kg CO₂e return
  5. Bodø, Norway6.9 °C cooler · 9.4 h sun a day · 4.4 mm rain a day · sea 6.4 °Cair ≈ 6h 6m · 487 kg CO₂e return
  6. Oulu, Finland6.9 °C cooler · 14.4 h sun a day · mostly dry · sea 2.2 °Cair ≈ 6h 6m · 483 kg CO₂e return
  7. Umeå, Sweden6.2 °C cooler · 15.0 h sun a day · mostly dry · sea 3.8 °Cair ≈ 5h 42m · 421 kg CO₂e return
  8. Erzurum, Turkey5.7 °C cooler · 10.8 h sun a day · 4.7 mm rain a dayair ≈ 7h 12m · 698 kg CO₂e return
  9. Kars, Turkey5.7 °C cooler · 10.5 h sun a day · 4.1 mm rain a dayair ≈ 7h 18m · 719 kg CO₂e return
  10. Vaasa, Finland5.4 °C cooler · 14.8 h sun a day · mostly dry · sea 5.2 °Cair ≈ 5h 42m · 412 kg CO₂e return

Without flying

The coolest places the train reaches within 15 hours. La Chaux-de-Fonds is 4.4 °C cooler for 10.7 kg — about 53× less carbon than flying to Tromsø.

  1. La Chaux-de-Fonds, Switzerland4.4 °C cooler · 9.6 h sun a day · 4.8 mm rain a dayrail ≈ 6h 6m · 10.7 kg CO₂e return
  2. Zakopane, Poland3.8 °C cooler · 11.1 h sun a day · 3.9 mm rain a dayrail ≈ 13h 48m · 24.0 kg CO₂e return
  3. Scarborough, United Kingdom3.7 °C cooler · 10.9 h sun a day · 1.9 mm rain a day · sea 9.8 °Crail ≈ 12h 54m · 43.6 kg CO₂e return
  4. Edinburgh, United Kingdom3.3 °C cooler · 9.7 h sun a day · 3.5 mm rain a day · sea 10.6 °Crail ≈ 14h · 61.7 kg CO₂e return
  5. Oldham, United Kingdom3.1 °C cooler · 10.2 h sun a day · 3.2 mm rain a dayrail ≈ 11h 48m · 40.0 kg CO₂e return
  6. Newcastle upon Tyne, United Kingdom2.9 °C cooler · 9.8 h sun a day · 2.7 mm rain a day · sea 10.1 °Crail ≈ 12h 30m · 50.8 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 Frankfurt in May within 15 hours is Tromsø, 9.3 °C cooler, costing 563 kg CO₂e return. The lowest-carbon option is Ilmenau at 5.0 kg — 113× less carbon, for 6.3 degrees less relief from the heat.

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

IlmenauTromsø
Where they are. Solid lines are rail or ferry, dashed are flights, from Frankfurt. Pick one to compare.
Carbon against relief from the heat, May, departing Frankfurt. Journeys of up to 15 hours each way.7 destinations. Lowest carbon Ilmenau at 5.0 kilograms and 3.0 °C cooler; best for relief from the heat Tromsø at 563 kilograms and 9.3 °C cooler. Ilmenau · 5.0 kgLa Chaux-de-Fonds · 10.7 kgÖstersund · 376 kgTromsø · 563 kg

By rail or ferry By air

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

What the 15-hour limit costs: at this budget Östersund can only be reached by air — 376 kg CO₂e, in 5h 30m. Allow up to 24 hours and the train does the same journey for 44.1 kg in 22h 6m — 9× less carbon for 16h 36m more travelling.

May from Frankfurt — 7 destinations on the frontier, 3 without flying.
DestinationHowCO₂e returnTempSun/dayRain/dayJourney
Ilmenau, GermanyRail5.0 kg12.2 °C10.4 h3.0 mm4h
Villingen-Schwenningen, GermanyRail6.7 kg12.0 °C9.6 h3.8 mm4h 48m
La Chaux-de-Fonds, SwitzerlandRail10.7 kg10.8 °C9.6 h4.8 mm6h 6m
Östersund, SwedenAir376 kg9.9 °C14.2 h0.7 mm5h 30m
Umeå, SwedenAir421 kg9.0 °C15.0 h0.6 mm5h 42m
Tornio, FinlandAir493 kg7.1 °C14.6 h0.7 mm6h 6m
Tromsø, NorwayAir563 kg5.9 °C7.0 h4.9 mm6h 30m

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 La Chaux-de-Fonds (10.7 kg, 4.4 °C cooler) to Östersund (376 kg, 5.3 °C cooler) buys 0.9 °C more relief from the heat for an extra 366 kg — 406 kg of CO₂e per degree. That single step is the most expensive relief from the heat on the whole curve.

The pick of them

IlmenauGermany5.0 kg CO₂e return12.2 °C · 10.4 h sun · 4h by railmild and brightLa Chaux-de-FondsSwitzerland10.7 kg CO₂e return10.8 °C · 9.6 h sun · 6h 6m by railmild and brightTromsø, NorwayTromsøNorway563 kg CO₂e return5.9 °C · 7.0 h sun · 6h 30m by aircold but bright

The same month, asked differently

May 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 Tromsø

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

Search places to stay in Tromsø →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 Frankfurt

May from elsewhere

Photo credits

Questions

Where is the coolest place to go from Frankfurt in May?

Tromsø, Norway, at 9.3 °C cooler. Reaching it emits 563 kg CO₂e return, travelling 6h 30m each way by air (modelled).

Can I get somewhere cool from Frankfurt in May without flying?

Yes. La Chaux-de-Fonds reaches 4.4 °C cooler and is reachable by rail or ferry in 6h 6m (modelled), emitting 10.7 kg CO₂e return — though Tromsø is cooler still, if you fly.

How much carbon does a return trip from Frankfurt to Tromsø produce?

563 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.