Similar Climates › City Pairings › Kolkata ≈ Vientiane
City Pairings
close match
Kolkata, India and Vientiane, Laos are a close climate match — 1,570 km (976 mi) apart. Kolkata is Köppen zone Aw; Vientiane is Aw.
See Kolkata on the interactive map →Kolkata and Vientiane both sit in the tropical savanna (Aw) zone, so their seasonal arcs line up. They sit only about 1,570 km (976 mi) apart — a short hop on the atlas for a climate match this close.
It is a close match: day-to-day weather in Vientiane should feel familiar if you know Kolkata. January means differ by 2°C (Vientiane warmer); July by 0°C (Vientiane cooler). Rainfall shifts more: Vientiane is 25 mm drier in July.
Sunshine stays close: Vientiane at 8.9 h/day on average versus 8.8 h/day in Kolkata (January 10 h / 9.7 h, July 7.8 h / 7.8 h). Air quality: mean PM2.5 is 13 µg/m³ in Vientiane vs 65 in Kolkata (lower by 51 µg/m³). Dew points differ modestly (January 15°C vs 13°C; July 24°C vs 26°C).
January & July · °C and mm
Compare Kolkata and Vientiane month by month on the interactive map →
See Vientiane's climate twin on its own page.
On Similar Climates, Vientiane, Laos is the closest distant match for Kolkata, India — scored close, about 1,570 km (976 mi) away.
Kolkata and Vientiane are separated by roughly 1,570 km (976 mi) on the great-circle route.
Yes — both cities are in the same hemisphere, so summer and winter fall in the same calendar months.
Yes — both are tropical savanna (Aw).
Kolkata has a tropical savanna climate (Aw). January averages a high of 27°C and a low of 14°C with 12 mm of rain; July averages 32°C / 26°C and 330 mm.
Kolkata averages about 9.7 hours of sunshine a day in January and 7.8 hours in July.
January PM2.5 averages about 115.2 µg/m³ (US AQI 196); July averages 14.1 µg/m³ (US AQI 59).
Other close climate matches for Kolkata: Ho Chi Minh City (fair), Darwin (loose), Cuiabá (loose).
All tropical savanna (Aw) cities on Similar Climates →
Explore Kolkata and Vientiane on the interactive map →