Stable water isotope data (δ18O and δ2H) of daily precipitation from 2022 to 2024 (NW Croatia)

This dataset presents the stable water isotopic composition (δ¹⁸O and δ²H) of daily precipitation collected in north-western Croatia (near Samobor town). A total of 288 precipitation samples were collected between December 2022 and November 2024, covering a period of two years. Each sample represents precipitation accumulated over a 24-hour period, with collection typically performed in the early morning. A RAIN SAMPLER RS1B, manufactured by Palmex, was used for sample collection. This rain gauge is specifically designed to collect and store precipitation samples while preventing post-collection evaporation.