0xCarbon
Rome · July · relief from the heat

Coolest places to go from Rome in July

The coolest place you can reach from Rome in July within 15 hours is Reykjavik, 17.1 °C cooler, costing 830 kg CO₂e return. The lowest-carbon option is Province of Macerata at 5.1 kg — 163× less carbon, for 14.8 degrees less relief from the heat.

The 10 coolest places within 15 hours of Rome

Ranked on relief from the heat in July 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. Reykjavik, Iceland17.1 °C cooler · 9.5 h sun a dayair 7h 54m · 830 kg CO₂e return
  2. Sligo, Ireland14.4 °C cooler · 7.8 h sun a dayair 6h 18m · 519 kg CO₂e return
  3. Aberdeen, United Kingdom14.3 °C cooler · 10.7 h sun a dayair 6h 12m · 500 kg CO₂e return
  4. Douglas, Isle of Man14.2 °C cooler · 10.2 h sun a dayair 6h · 465 kg CO₂e return
  5. Bergen, Norway13.9 °C cooler · 9.2 h sun a dayair 6h 18m · 532 kg CO₂e return
  6. Oldham, United Kingdom13.8 °C cooler · 9.4 h sun a dayair 5h 48m · 425 kg CO₂e return
  7. Belfast, United Kingdom13.8 °C cooler · 9.5 h sun a dayair 6h 6m · 491 kg CO₂e return
  8. Tralee, Ireland13.8 °C cooler · 8.6 h sun a dayair 6h 12m · 510 kg CO₂e return
  9. Östersund, Sweden13.7 °C cooler · 12.0 h sun a dayair 6h 42m · 596 kg CO₂e return
  10. Haugesund, Norway13.6 °C cooler · 10.8 h sun a dayair 6h 12m · 506 kg CO₂e return

Without flying

The coolest places the train reaches within 15 hours. La Chaux-de-Fonds is 11.0 °C cooler for 21.6 kg — about 38× less carbon than flying to Reykjavik.

  1. La Chaux-de-Fonds, Switzerland11.0 °C cooler · 12.1 h sun a dayrail 9h 12m · 21.6 kg CO₂e return
  2. Siegen, Germany10.6 °C cooler · 10.8 h sun a dayrail 14h 18m · 31.2 kg CO₂e return
  3. Wuppertal, Germany10.2 °C cooler · 10.9 h sun a dayrail 15h · 33.0 kg CO₂e return
  4. Charleroi, Belgium10.0 °C cooler · 10.8 h sun a dayrail 14h 54m · 33.4 kg CO₂e return
  5. Rouen, France9.9 °C cooler · 10.7 h sun a dayrail 15h · 36.0 kg CO₂e return
  6. Luxembourg, Luxembourg9.8 °C cooler · 11.0 h sun a dayrail 12h 54m · 29.2 kg CO₂e return

Rail times are modelled; air times include getting to and through the airport.

The low-carbon trade-off

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

Province of MacerataReykjavik
Where they are. Solid lines are rail or ferry, dashed are flights, from Rome. Pick one to compare.
Carbon against relief from the heat, July, departing Rome. Journeys of up to 15 hours each way.10 destinations. Lowest carbon Province of Macerata at 5.1 kilograms and 2.3 °C cooler; best for relief from the heat Reykjavik at 830 kilograms and 17.1 °C cooler. Province of Macerata · 5.1 kgLa Chaux-de-Fonds · 21.6 kgHigh Wycombe · 371 kgReykjavik · 830 kg

By rail or ferry By air

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

What the 15-hour limit costs: at this budget Buxton can only be reached by air — 417 kg CO₂e, in 5h 42m. Allow up to 24 hours and the train does the same journey for 60.8 kg in 21h — 7× less carbon for 15h 18m more travelling.

July from Rome — 10 destinations on the frontier, 7 without flying.
DestinationHowCO₂e returnTempSun/dayRain/dayJourney
Province of Macerata, ItalyRail5.1 kg25.7 °C13.9 h1.1 mm4h
Campobasso, ItalyRail5.4 kg24.3 °C13.7 h0.6 mm4h 12m
Bugojno, Bosnia and HerzegovinaRail13.8 kg22.1 °C13.5 h1.8 mm13h 6m
Villach, AustriaRail15.8 kg21.2 °C12.4 h3.5 mm8h 54m
Garmisch-Partenkirchen, GermanyRail18.7 kg19.0 °C11.0 h6.9 mm9h 24m
Sonthofen, GermanyRail19.2 kg18.2 °C10.8 h5.8 mm9h
La Chaux-de-Fonds, SwitzerlandRail21.6 kg17.0 °C12.1 h5.4 mm9h 12m
High Wycombe, United KingdomAir371 kg16.2 °C10.3 h3.3 mm5h 30m
Buxton, United KingdomAir417 kg13.5 °C9.7 h4.7 mm5h 42m
Reykjavik, IcelandAir830 kg10.9 °C9.5 h2.9 mm7h 54m

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 (21.6 kg, 11.0 °C cooler) to High Wycombe (371 kg, 11.8 °C cooler) buys 0.8 °C more relief from the heat for an extra 350 kg — 437 kg of CO₂e per degree. That single step is the most expensive relief from the heat on the whole curve.

The pick of them

Province of MacerataItaly5.1 kg CO₂e return25.7 °C · 13.9 h sun · 4h by railwarm, bright and dryLa Chaux-de-FondsSwitzerland21.6 kg CO₂e return17.0 °C · 12.1 h sun · 9h 12m by railwarm but wetReykjavik, IcelandReykjavikIceland830 kg CO₂e return10.9 °C · 9.5 h sun · 7h 54m by airmild and bright

The same month, asked differently

July 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 Rome

July from elsewhere

Photo credits

Questions

Where is the coolest place to go from Rome in July?

Reykjavik, Iceland, at 17.1 °C cooler. Reaching it emits 830 kg CO₂e return, travelling 7h 54m each way by air (modelled).

Can I get somewhere cool from Rome in July without flying?

Yes. La Chaux-de-Fonds reaches 11.0 °C cooler and is reachable by rail or ferry in 9h 12m (modelled), emitting 21.6 kg CO₂e return — though Reykjavik is cooler still, if you fly.

How much carbon does a return trip from Rome to Reykjavik produce?

830 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.