Rome · July · relief from the heat

Coolest places to go from Rome in July

In July, the coolest well-known place within 15 hours of Rome is Reykjavik, Iceland, 17.1 °C cooler than Rome and 9.5 h sun a day, about 7h 54m each way by air. Without flying, it is La Chaux-de-Fonds, Switzerland, 11.0 °C cooler than Rome, about 9h 12m each way by train, for about 38× less carbon (21.6 kg CO₂e return against 830 kg).

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.

Reykjavik, Iceland17.1 °C cooler · 9.5 h sun a day · 2.9 mm rain a day · sea 11.1 °Cair ≈ 7h 54m · 830 kg CO₂e return
Sligo, Ireland14.4 °C cooler · 7.8 h sun a day · 6.3 mm rain a day · sea 15.5 °Cair ≈ 6h 18m · 519 kg CO₂e return
Aberdeen, United Kingdom14.3 °C cooler · 10.7 h sun a day · 4.2 mm rain a day · sea 12.8 °Cair ≈ 6h 12m · 500 kg CO₂e return
Douglas, Isle of Man14.2 °C cooler · 10.2 h sun a day · 5.2 mm rain a day · sea 14.2 °Cair ≈ 6h · 465 kg CO₂e return
Bergen, Norway13.9 °C cooler · 9.2 h sun a day · 7.7 mm rain a day · sea 15.1 °Cair ≈ 6h 18m · 532 kg CO₂e return
Oldham, United Kingdom13.8 °C cooler · 9.4 h sun a day · 5.2 mm rain a dayair ≈ 5h 48m · 425 kg CO₂e return
Belfast, United Kingdom13.8 °C cooler · 9.5 h sun a day · 4.2 mm rain a dayair ≈ 6h 6m · 491 kg CO₂e return
Tralee, Ireland13.8 °C cooler · 8.6 h sun a day · 5.6 mm rain a dayair ≈ 6h 12m · 510 kg CO₂e return
Östersund, Sweden13.7 °C cooler · 12.0 h sun a day · 4.4 mm rain a dayair ≈ 6h 42m · 596 kg CO₂e return
Haugesund, Norway13.6 °C cooler · 10.8 h sun a day · 7.0 mm rain a day · sea 15.2 °Cair ≈ 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.

La Chaux-de-Fonds, Switzerland11.0 °C cooler · 12.1 h sun a day · 5.4 mm rain a dayrail ≈ 9h 12m · 21.6 kg CO₂e return
Siegen, Germany10.6 °C cooler · 10.8 h sun a day · 3.8 mm rain a dayrail ≈ 14h 18m · 31.2 kg CO₂e return
Wuppertal, Germany10.2 °C cooler · 10.9 h sun a day · 3.9 mm rain a dayrail ≈ 15h · 33.0 kg CO₂e return
Charleroi, Belgium10.0 °C cooler · 10.8 h sun a day · 3.5 mm rain a dayrail ≈ 14h 54m · 33.4 kg CO₂e return
Rouen, France9.9 °C cooler · 10.7 h sun a day · 3.2 mm rain a dayrail ≈ 15h · 36.0 kg CO₂e return
Luxembourg, Luxembourg9.8 °C cooler · 11.0 h sun a day · 2.7 mm rain a dayrail ≈ 12h 54m · 29.2 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 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.

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.

Where they are. Solid lines are rail or ferry, dashed are flights, from Rome. Pick one to compare.

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.
Destination	How	CO₂e return	Temp	Sun/day	Rain/day	Journey
Province of Macerata, Italy	Rail	5.1 kg	25.7 °C	13.9 h	1.1 mm	4h
Campobasso, Italy	Rail	5.4 kg	24.3 °C	13.7 h	0.6 mm	4h 12m
Bugojno, Bosnia and Herzegovina	Rail	13.8 kg	22.1 °C	13.5 h	1.8 mm	13h 6m
Villach, Austria	Rail	15.8 kg	21.2 °C	12.4 h	3.5 mm	8h 54m
Garmisch-Partenkirchen, Germany	Rail	18.7 kg	19.0 °C	11.0 h	6.9 mm	9h 24m
Sonthofen, Germany	Rail	19.2 kg	18.2 °C	10.8 h	5.8 mm	9h
La Chaux-de-Fonds, Switzerland	Rail	21.6 kg	17.0 °C	12.1 h	5.4 mm	9h 12m
High Wycombe, United Kingdom	Air	371 kg	16.2 °C	10.3 h	3.3 mm	5h 30m
Buxton, United Kingdom	Air	417 kg	13.5 °C	9.7 h	4.7 mm	5h 42m
Reykjavik, Iceland	Air	830 kg	10.9 °C	9.5 h	2.9 mm	7h 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 dry La Chaux-de-FondsSwitzerland21.6 kg CO₂e return17.0 °C · 12.1 h sun · 9h 12m by railwarm but wet

ReykjavikIceland830 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

Reykjavik: Hedwig Storch, CC BY-SA 3.0, via Wikimedia Commons
Sligo: Gerd Eichmann, CC BY-SA 4.0, via Wikimedia Commons
Aberdeen: Ragazzi00, CC BY-SA 3.0, via Wikimedia Commons
Douglas: Jim Linwood, CC BY 2.0, via Wikimedia Commons
Bergen: W. Bulach, CC BY-SA 4.0, via Wikimedia Commons
Oldham: Matt from Oldham, UK, CC BY 2.0, via Wikimedia Commons
Tralee: Colin Park, CC BY-SA 2.0, via Wikimedia Commons
Östersund: Lars Falkdalen Lindahl (User:Njaelkies Lea), CC BY-SA 3.0, via Wikimedia Commons
Haugesund: Efarestv, CC BY-SA 3.0, via Wikimedia Commons
Luxembourg: Pierre Blaché from Paris, France, CC0, via Wikimedia Commons

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.