In Tamil Nadu (India), 88 cities are covered with full historical weather data. Whether you want to see how summer temperatures have evolved across the decades or how one rainy year compared to another, the data is available for every month since 1940. Pick your city below to begin.
Back to comparison toolPick one of the 88 cities above to open a page where you put any two time periods side by side. Temperature, sunshine hours, precipitation, and peak wind all come as daily and monthly means. If you would rather see several years of the same month next to each other, follow the climate-trend link on any city card. It shows up to ten years at a glance.
To get a first sense of Tamil Nadu, start with the most populous city on the list. The weather data for each city is drawn from a tight grid, so the contrast between coast, plain, and low mountain range in the region is visible straight from the numbers. If extremes are your focus, heat waves, cold snaps, or heavy-rain events, compare the same calendar window between two different years.
All values come from the ECMWF ERA5 reanalysis dataset, delivered via the Open-Meteo archive API. ERA5 blends global satellite and station measurements into a gap-free grid that serves the same variables for every city in Tamil Nadu: daily high and low temperature, sunshine duration, total precipitation, and the maximum wind speed at ten metres above ground. The time series reaches back to 1940, so historical heatwaves and cold winters compare cleanly with the current state.
Because the data is reanalysed, meaning retrospectively calibrated with every available observation, the values stay consistent from long-ago years into the recent past. That makes comparisons across Tamil Nadu fair: numbers from 1970 and from 2025 come from the same product, only with different observation densities in the background. The comparison is free and ad-free. For details on a single city, just open its card above.
Pick one of the 88 cities in Tamil Nadu below and compare any two time periods. Temperature, sunshine, precipitation and wind data go back to 1940.
We cover 88 cities in Tamil Nadu: Alandur, Allinagaram, Ambattur, Ambur, Anaiyur, Arakkonam and 82 more. Each city has its own comparison page and a multi-year climate trend.
The data comes from the ERA5 reanalysis product by ECMWF, served via Open-Meteo. ERA5 is one of the most accurate global historical weather datasets and covers every city on an 11 × 11 km grid.