| 1793 | First Meteorological Observatory at Madras |
| 1823 | Second Observatory at Colaba (Bombay) began |
| 1836 | Thiruvananthapuram Observatory started |
| 1841 | Systematic Observational Recordings started; Simla Observatory began |
| 1848 | Recording Maximum and Minimum temperature started |
| 1856 | Practice of Hourly Surface Observations began |
| 1875 | India Meteorological Department established |
| 1877 | Alipore observatory was founded |
| 1878 | India Daily Weather report made first appearance |
| 1886 | Central Met. HQrs. at Calcutta; Central Library of Data at Alipore |
| 1889 | First normals prepared (with a few data available till then) |
| 1906 | Transfer of HQrs. to Simla; Records transferred to Simla; First Climatological Atlas prepared |
| 1926 | First Scientific note (Meteorological) published |
| 1928 | Transfer of Simla HQrs to Pune; All data records transferred to Pune Office |
| 1932 | Decentralisation of Control and Pune Office became independent |
| 1942 | Director General of Observatories (Clim. & Geo-Phys.) made repository of Climatological Data of Department |
| 1945 | Introduction of Handpunching Machines / Verifiers |
| 1950 | Transfer of daily upper air data on punch cards |
| 1952 | Usage of Hollerith Tabulators, Sorters and reproducers |
| 1967 | Collators installed |
| 1968 | Central Data Punching (CDP) Unit established |
| 1972 | Kard Vayer facility for indexing purpose installed |
| 1977 | National Data Centre (NDC) established; EC 1040 installed and electronic data processing started; development of building a Compact storgae of data |
| 1980 | EC 9002 Key-to-tape (Data Entry) machine installed |
| 1983 | DCM data entry machines introduced |
| 1986 | VAX 11 / 730 (with magnetic tape and disk drive units) installed |
| 1993 | VAX 4000/300 (with large number of peripherals viz., PC's, workstations, CTD's and plotter); digitisers installed. |
| 1995 | PC Data Entry Machines installed (replacing DCM machines) |
| 1999 | Internet installed to facilitate and support the activities of Long Range Forecasting and Weather Forecasting |
| 2000 | IMD Website and of RMCs, Chennai, Mumbai & Kolkata established |
| 2001 | Hydrology Project implemented; NDC being the nodal and became its Data Storage Centre |
| 2002 | VAX 4000/300 system Expanded; A Powerful COMPAQ server added to the network enhancing the existing system capabilities |