Coolest places to go from Madrid in May
In May, the coolest well-known place within 15 hours of Madrid is Tromsø, Norway, 11.7 °C cooler than Madrid and 7.0 h sun a day, about 8h 12m each way by air. Without flying, it is La Chaux-de-Fonds, Switzerland, 6.8 °C cooler than Madrid, about 14h 18m each way by train, for about 27× less carbon (33.2 kg CO₂e return against 882 kg).
The 10 coolest places within 15 hours of Madrid
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.
Tromsø, Norway11.7 °C cooler · 7.0 h sun a day · 4.9 mm rain a dayair ≈ 8h 12m · 882 kg CO₂e return
Reykjavik, Iceland11.0 °C cooler · 6.4 h sun a day · 5.9 mm rain a day · sea 7.5 °Cair ≈ 7h 24m · 727 kg CO₂e return- Rovaniemi, Finland9.8 °C cooler · 13.4 h sun a day · mostly dryair ≈ 8h 6m · 861 kg CO₂e return
Luleå, Sweden9.7 °C cooler · 14.8 h sun a day · mostly dry · sea 1.5 °Cair ≈ 7h 48m · 815 kg CO₂e return
Bodø, Norway9.3 °C cooler · 9.4 h sun a day · 4.4 mm rain a day · sea 6.4 °Cair ≈ 7h 42m · 801 kg CO₂e return- Oulu, Finland9.3 °C cooler · 14.4 h sun a day · mostly dry · sea 2.2 °Cair ≈ 7h 54m · 831 kg CO₂e return
Umeå, Sweden8.6 °C cooler · 15.0 h sun a day · mostly dry · sea 3.8 °Cair ≈ 7h 30m · 763 kg CO₂e return- Erzurum, Turkey8.1 °C cooler · 10.8 h sun a day · 4.7 mm rain a dayair ≈ 8h 30m · 885 kg CO₂e return
Kars, Turkey8.1 °C cooler · 10.5 h sun a day · 4.1 mm rain a dayair ≈ 8h 42m · 915 kg CO₂e return- Vaasa, Finland7.8 °C cooler · 14.8 h sun a day · mostly dry · sea 5.2 °Cair ≈ 7h 30m · 760 kg CO₂e return
Without flying
The coolest places the train reaches within 15 hours. La Chaux-de-Fonds is 6.8 °C cooler for 33.2 kg — about 27× less carbon than flying to Tromsø.
- La Chaux-de-Fonds, Switzerland6.8 °C cooler · 9.6 h sun a day · 4.8 mm rain a dayrail ≈ 14h 18m · 33.2 kg CO₂e return
Andorra la Vella, Andorra5.5 °C cooler · 12.4 h sun a day · 4.3 mm rain a dayrail ≈ 7h 6m · 14.6 kg CO₂e return- Bern, Switzerland4.9 °C cooler · 9.7 h sun a day · 4.9 mm rain a dayrail ≈ 14h 36m · 34.0 kg CO₂e return
Vitoria-Gasteiz, Spain4.8 °C cooler · 10.4 h sun a day · 2.7 mm rain a dayrail ≈ 5h 36m · 8.4 kg CO₂e return
Lugo, Spain4.6 °C cooler · 10.5 h sun a day · 3.3 mm rain a dayrail ≈ 6h 36m · 12.7 kg CO₂e return- Saint-Etienne, France4.5 °C cooler · 9.6 h sun a day · 3.9 mm rain a dayrail ≈ 11h 24m · 25.5 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 Madrid in May within 15 hours is Reykjavik, 11.0 °C cooler, costing 727 kg CO₂e return. The lowest-carbon option is Valladolid at 4.8 kg — 151× less carbon, for 8.1 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.
By rail or ferry By air
| Destination | How | CO₂e return | Temp | Sun/day | Rain/day | Journey |
|---|---|---|---|---|---|---|
| Valladolid, Spain | Rail | 4.8 kg | 14.7 °C | 12.4 h | 1.7 mm | 2h 30m |
| Soria, Spain | Rail | 5.4 kg | 12.5 °C | 12.8 h | 1.6 mm | 4h 6m |
| La Chaux-de-Fonds, Switzerland | Rail | 33.2 kg | 10.8 °C | 9.6 h | 4.8 mm | 14h 18m |
| Östersund, Sweden | Air | 705 kg | 9.9 °C | 14.2 h | 0.7 mm | 7h 12m |
| Reykjavik, Iceland | Air | 727 kg | 6.6 °C | 6.4 h | 5.9 mm | 7h 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 La Chaux-de-Fonds (33.2 kg, 6.8 °C cooler) to Östersund (705 kg, 7.7 °C cooler) buys 0.9 °C more relief from the heat for an extra 672 kg — 747 kg of CO₂e per degree. That single step is the most expensive relief from the heat on the whole curve.
The pick of them
ReykjavikIceland727 kg CO₂e returncoolThe 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 Reykjavik
Places to stay in Reykjavik, Iceland, on a live map. Prices and availability come from Stay22 and its booking partners.
Search places to stay in Reykjavik →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 Madrid
May from elsewhere
- Amsterdam
- Barcelona
- Berlin
- Birmingham
- Bristol
- Brussels
- Cardiff
- Copenhagen
- Dublin
- Edinburgh
- Frankfurt
- Glasgow
- Leeds
- Lisbon
- Liverpool
- London
- Madrid
- Manchester
- Milan
- Munich
- Newcastle
- Nottingham
- Oslo
- Paris
- Prague
- Rome
- Sheffield
- Southampton
- Stockholm
- Vienna
- Warsaw
- Zurich
Photo credits
- Reykjavik: Hedwig Storch, CC BY-SA 3.0, via Wikimedia Commons
- Tromsø: Diego Delso, CC BY-SA 4.0, via Wikimedia Commons
- Luleå: Andreas Harnemo, CC BY-SA 3.0, via Wikimedia Commons
- Bodø: Røed 20:41, 24 July 2006 (UTC), CC BY-SA 2.5, via Wikimedia Commons
- Umeå: Jonipoon, CC BY-SA 4.0, via Wikimedia Commons
- Kars: Bjørn Christian Tørrissen, CC BY-SA 3.0, via Wikimedia Commons
- Andorra la Vella: Tiia Monto, CC BY-SA 3.0, via Wikimedia Commons
- Vitoria-Gasteiz: User:Vmenkov, CC BY-SA 3.0, via Wikimedia Commons
- Lugo: Fausto Alava-Moreno, CC BY-SA 2.0, via Wikimedia Commons
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Questions
Where is the coolest place to go from Madrid in May?
Reykjavik, Iceland, at 11.0 °C cooler. Reaching it emits 727 kg CO₂e return, travelling 7h 24m each way by air (modelled).
Can I get somewhere cool from Madrid in May without flying?
Yes. La Chaux-de-Fonds reaches 6.8 °C cooler and is reachable by rail or ferry in 14h 18m (modelled), emitting 33.2 kg CO₂e return — though Reykjavik is cooler still, if you fly.
How much carbon does a return trip from Madrid to Reykjavik produce?
727 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.