Sunniest places to go from London in May
The sunniest place you can reach from London in May within 15 hours is Gävle at 14.7 h, costing 370 kg CO₂e return. The lowest-carbon option is Calais at 4.5 kg — 82× less carbon for 3.5 h less.
Every destination here is on the efficiency frontier: nowhere else in Europe is both sunnier in May and lower in carbon. Anything a better option beats outright has been left out.
By rail or ferry By air
What the 15-hour limit costs: at this budget Gävle can only be reached by air — 370 kg CO₂e, in 5h 30m. Allow up to 24 hours and the train does the same journey for 43.4 kg in 22h 6m — 9× less carbon for 16h 36m more travelling.
| Destination | How | CO₂e return | Temp | Sun/day | Rain/day | Journey |
|---|---|---|---|---|---|---|
| Calais, France | Rail | 4.5 kg | 12.9 °C | 11.2 h | 2.3 mm | 4h 6m |
| Leiden, The Netherlands | Rail | 9.6 kg | 13.7 °C | 11.7 h | 3.9 mm | 6h 30m |
| Kiel, Germany | Rail | 22.3 kg | 13.2 °C | 12.3 h | 1.9 mm | 12h 18m |
| Aarhus, Denmark | Rail | 25.1 kg | 12.7 °C | 13.0 h | 1.1 mm | 13h 42m |
| Allerød Municipality, Denmark | Rail | 28.1 kg | 13.3 °C | 13.8 h | 0.7 mm | 15h |
| Karlstad, Sweden | Air | 307 kg | 13.6 °C | 14.3 h | 1.1 mm | 5h 6m |
| Gävle, Sweden | Air | 370 kg | 12.6 °C | 14.7 h | 0.7 mm | 5h 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 Allerød Municipality (28.1 kg, 13.8 h) to Karlstad (307 kg, 14.3 h) buys 0.5 hours more sunshine for an extra 279 kg — 559 kg of CO₂e per hour. That single step is the most expensive sunshine on the whole curve.
The pick of them
If you'd rather have heat than sunshine
May answers differently depending on what you're after. The warmest destinations from London in May are a different list — hours of sunshine and degrees of warmth come apart, especially early and late in the year.
Where to stay in Gävle
Places to stay in Gävle, Sweden, on a live map. Prices and availability come from Stay22 and its booking partners.
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
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
Questions
Where is the sunniest place to go from London in May?
Gävle, Sweden, at 14.7 h. Reaching it emits 370 kg CO₂e return, travelling 5h 30m each way by air.
Can I get somewhere sunny from London in May without flying?
Yes. Allerød Municipality reaches 13.8 h and is reachable by rail or ferry in 15h, emitting 28.1 kg CO₂e return — though Gävle is sunnier still, if you fly.
How much carbon does a return trip from London to Gävle produce?
370 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.