Where do the climate numbers come from?

Temperature and rainfall come from GeoRank's ERA5/CHELSA climatology pipeline on a 0.05° grid (roughly 5 km). Sunshine hours are ERA5 values corrected against 56 WMO reference stations (R²=0.82), accurate to about ±8% for most locations.

Why monthly instead of annual averages?

Annual averages hide the story. Lisbon and London differ by 1,294 annual sunshine hours, but the decision-relevant fact is the winter: Lisbon's January mean is 11.4°C with 87 mm of rain; London's is 4.9°C. Seasonality is what you actually live in.

Tool 03 · Interactive · 478 cities

Compare the Climate of Any Two Cities

Name: GeoRank Calibrated City Climate Dataset
Creator: GeoRank
License: https://creativecommons.org/licenses/by/4.0/

Month-by-month temperature, rainfall, and calibrated sunshine for 478 cities. Lisbon gets 2,772 sun hours a year — 88% more than London's 1,478.

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Climate console — 478 cities · ERA5 + CHELSA calibrated

City A

City B

Worked example

Lisbon vs London, month by month

Month	Lisbon °C	London °C	Lisbon mm	London mm
January	11.4	4.9	87	61
February	12.0	4.8	71	44
March	13.8	6.9	54	47
April	14.7	9.1	67	48
May	16.7	12.4	47	54
June	19.6	15.4	15	49
July	21.3	17.6	4	48
August	21.7	17.4	6	55
September	20.6	14.7	32	58
October	17.9	11.3	96	73
November	14.6	7.7	113	68
December	12.4	5.2	116	62

The annual averages (Lisbon 16.3°C, London ~10°C) understate the difference where it matters: winter. Lisbon's January is 6.5°C warmer than London's, and Lisbon's summer is effectively rain-free — 4 mm in July vs London's 48 mm. Lisbon's rain concentrates in October–December; London's is spread across all twelve months.

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FAQ

Frequently asked questions

How much sunnier is Lisbon than London?

2,772 calibrated sunshine hours a year vs 1,478 — 88% more. In January, Lisbon's mean is 11.4°C vs London's 4.9°C.

Where do the numbers come from?

ERA5/CHELSA climatology on a 0.05° (~5 km) grid; sunshine corrected against 56 WMO reference stations (R²=0.82, ±8% typical).

Is this current weather or climate?

Climate — 1991–2020 monthly averages, not a forecast. It answers "what is winter actually like there", not "will it rain on Tuesday".

Why monthly instead of annual?

Annual averages hide seasonality. Lisbon's July has 4 mm of rain; its November has 113 mm. You live in months, not in averages.

Can I see this on a map?

Yes — the map renders the same calibrated grid as temperature, rainfall, and sunshine layers with a month slider, for every location on Earth.

Climate is one layer. See all seven.

Pin your shortlist and weigh sunshine against cost, tax, safety, and air quality — as deltas vs. your home.

Open the Map → Pin & Compare with Your Home →

About the data: GeoRank is built by a small team that thinks moving abroad shouldn't be guesswork. We calibrate climate data against weather stations and publish the accuracy bands — the same 0.05° grid that renders the map layers produced every number on this page. See the methodology for source-by-source detail.

Sources: ERA5 (Copernicus Climate Data Store) · CHELSA climatology · 56 WMO/KNMI reference stations. Methodology and accuracy bounds at methodology.

Compare the Climate of Any Two Cities

Month by month

Lisbon vs London, month by month

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Frequently asked questions

Climate is one layer. See all seven.