This work re-creates a historical climatic record for Limón, Costa Rica, for the year 1886 at the time of early expansion by the United Fruit Company (UFCO) in the Caribbean. The study forms part of wider research into local UFCO territorial interventions along railway lines, agroeconomic enclaves and architectural occurs from 1890 to 1930. Archival meteorological data as monthly means of temperature, relative humidity, precipitation and solar radiation were constructed to continuous hourly dataset with the aid of interpolation procedures and empirical models, and in particular based on the Hargreaves-Samani equation. The data were processed in Python (implemented in Google Colab), and the validated output was converted to an EnergyPlus Weather (EPW) file format facilitating integration with building performance simulation tools, such as Design Builder. A 3D model of Limón Hospital, typical of the UFCO facilities, was created from the original blueprints available at the National Archive of Costa Rica. Models run with the 1886 EPW file illustrated how the hospital passive design responded to the climatic setting of the tropical climate. The findings emphasize the impact of climate in early building practices in Limón, and the significance of these to current conservation and adaptive reuse. The proposed approach provides a methodologically and applicationally replicable model of reconstructing climatic history, and it contributes to heritage and sustainable planning research in the tropics.