Erft (Germnay)

Climate

According to the Koppen Geiger classification, the catchment climate is temperate (Cfb), it is characterized by a warm summer and constant precipitations throughout the year without any difference between the seasons (Beck et al., 2023).

Precipitation

The average yearly precipitation, from 1979 to 2024, in the basin is estimated at 815 mm/year with a monthly distribution varying slightly between 53 mm in March and 79 mm in May (Beck et al., 2019).

Air temperature

The Erft River Basin experiences a clear seasonal temperature variation throughout the year. Winters are mild, with temperatures averaging around 2–3°C in January. As spring progresses, temperatures rise steadily, transitioning into warm summers where monthly averages peak at approximately 19–20°C in July and August. Autumn brings a gradual but consistent cooling, returning the basin to its mild winter conditions by December. (Copernicus Climate Change Service, 2019).

References

Beck, H. E., McVicar, T. R., Vergopolan, N., Berg, A., Lutsko, N. J., Dufour, A., Zeng, Z., Jiang, X., Van Dijk, A. I. J. M., & Miralles, D. G. (2023). High-resolution (1 km) Köppen-Geiger maps for 1901–2099 based on constrained CMIP6 projections. Scientific Data, 10(1), 724. https://doi.org/10.1038/s41597-023-02549-6

Beck, H. E., Wood, E. F., Pan, M., Fisher, C. K., Miralles, D. G., Van Dijk, A. I. J. M., McVicar, T. R., & Adler, R. F. (2019). MSWEP V2 Global 3-Hourly 0.1° Precipitation: Methodology and Quantitative Assessment. Bulletin of the American Meteorological Society, 100(3), 473–500. https://doi.org/10.1175/BAMS-D-17-0138.1

Copernicus Climate Change Service. (2019). ERA5-Land monthly averaged data from 1950 to present [Dataset]. Copernicus Climate Change Service (C3S) Climate Data Store (CDS). https://doi.org/10.24381/CDS.68D2BB30