Climate
London logs 18 frost days a year to Portsmouth's 1 — Portsmouth wins by 17. Portsmouth also leads on sunny days by 38.
London
Feels-like °C
Dinner outside
Portsmouth
Feels-like °C
Dinner outside
Cost of Living
London averages $3,737/mo for balanced living; Portsmouth has no cost baseline yet.
London
$3,737monthly · balanced
Mobility
London scores 4.0 on mobility (0–5 scale); Portsmouth has no mobility baseline.
Culture
London's culture score of 4.9 sits well above Portsmouth's 0.0.
Nature & Outdoors
London scores 3.8 on nature & outdoors (0–5 scale); Portsmouth has no nature & outdoors baseline.
Safety
London scores 2.5 on safety (0–5 scale); Portsmouth has no safety baseline.
Career
London scores 5.0 on career (0–5 scale); Portsmouth has no career baseline.
Social & Community
London scores 4.0 on social & community (0–5 scale); Portsmouth has no social & community baseline.
Food & Dining
London scores 5.0 on food & dining (0–5 scale); Portsmouth has no food & dining baseline.
Family
London scores 4.6 on family (0–5 scale); Portsmouth has no family baseline.
Healthcare
London scores 3.4 on healthcare (0–5 scale); Portsmouth has no healthcare baseline.
Air Quality
London averages 8.6 µg/m³ (good) PM2.5 annually versus Portsmouth's 8.1 µg/m³ (good) — Portsmouth breathes ~6% cleaner air (0.5 µg/m³ lower).
London
Portsmouth
PM2.5 annual average
WHO classification
City Scale
Both maps at the same real-world scale — 1 cm on either map is the same distance.
London (10.4M) and Portsmouth (480K) are 22x in population — London is the larger metro, Portsmouth the smaller; on land area London spans roughly 10x more ground.
London is roughly 15x the scale of Portsmouth
Combined population & area comparison
LondonPortsmouthCity Scale Rankings
London10.4M22xPortsmouth480K1xLondon1,649 km²10xPortsmouth158 km²1xLondon
Portsmouth
Who Thrives Here
London is the stronger fit for the career builder. Both cities work well for the clean air seeker.
Also compared
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Bangkok 
Barcelona 
Berlin Frequently asked about London vs Portsmouth
▶Which is cheaper, London or Portsmouth?
▶How does the climate compare between London and Portsmouth?
▶Is London or Portsmouth safer?
▶Should I move to London or Portsmouth?
The best city depends on what matters to you
This comparison shows how London and Portsmouth stack up on the data. But your climate preferences, budget, career needs, and lifestyle priorities can shift the picture entirely. A personalized diagnostic finds what fits your life.
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