**5. Conclusions**

In this study, the evaluation of the GPM IMERG performance over the lake Titicaca Basin at different time scales was performed by validating an IMERG grid point with rain gauge measurements.

This study concluded that in general, IMERG products provide a valuable opportunity to understand the precipitation characteristics detected by remote sensors. However, the performance could differ on different time scales, with the most promising result, according to the performance metrics, being the monthly time scale, especially IMERG-F, followed by the annual and then the daily scale. The difference between IMERG-E and IMERG-L were minimal due to the fact that they maintain a faster latency. Despite this, considerable biases can be observed in the IMERG data and in future research, bias correction is necessary before using the data for consideration in various hydrometeorological applications.

**Author Contributions:** Conceptualization, L.A.Q., E.P. and E.L.; methodology, L.A.Q. and E.P.; software, L.A.Q. and E.P.; validation, L.A.Q., E.P. and E.L.; formal analysis, L.A.Q., E.P. and E.L.; investigation, L.A.Q. and E.P.; data curation, L.A.Q.; writing—original draft preparation, L.A.Q. and E.P.; writing—review and editing, L.A.Q., E.P. and E.L.; visualization, L.A.Q. and E.P.; supervision, E.L. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research received no external funding.

**Institutional Review Board Statement:** Not applicable.

**Informed Consent Statement:** Not applicable.

**Data Availability Statement:** Not applicable.

**Acknowledgments:** The authors would like to thank the Servicio Nacional de Meteorología e Hidrología of Peru and Bolivia for providing the set of rain gauge measurements and GIOVANNI— NASA for providing the SPPs GPM IMERG V06.

**Conflicts of Interest:** The authors declare no conflict of interest.
