CSI-Based Instantaneous Rainfall Monitoring in Sub-6 GHz for ISAC Applications

This dataset contains multi-antenna channel state information (CSI) measurements collected under natural rainfall events in the sub-6 GHz band. The dataset includes four temporally separated rainfall events (Case 1–Case 4) collected between August 11, 2025, and September 25, 2025, in Nanjing, China. Each CSI sample consists of a complex-valued matrix of dimension 3276 × 8, corresponding to 3276 OFDM subcarriers and 8 receive antennas. CSI samples were collected at 3-second intervals. Ground-truth rainfall intensity measurements were obtained using an OTT Parsivel² optical disdrometer with a temporal resolution of 10 seconds. A commercial Doppler weather radar (24 GHz) dataset is also provided for comparison. To comply with the journal review process and ensure fair evaluation, the dataset is released in a staged manner. At the current stage, Case 1 and Case 4 are publicly available. The remaining cases (Case 2 and Case 3) will be released upon formal acceptance of the associated paper. This dataset is released for academic and non-commercial research purposes only.