Individual analysis by river basin

Marañon River Basin

Updated on February 18, 2026

Accumulated precipitation vs climatology

30 days
chart

Comparison between climatological quantiles and observed accumulation.

Anomaly and trend

14 to 28 days
chart

Anomaly, forecast and observed indicators.

Basin highlights

The climatology of the period under analysis indicates rainfall with records varying between 158 and 180 mm being considered normal (reference quantiles 42.5% and 57.5%). On February 18, 2026, 257 mm of average accumulated precipitation was observed over the basin in 30 days, the calculation of the average of the categorized anomaly index in the basin area the value of 1.9, classifies the basin as tendency to very rainy condition. In the coming weeks, climate behavior indicates a increase in rainfall volumes, the sub-seasonal forecast model suggests very rainy behavior or a tending to be very rainy.

Climatology

158 mm - 180 mm

Observed 30 days

257 mm

Anomaly index

1.9

Basin classification

tendency to very rainy condition

Forecast

very rainy behavior or a tending to be very rainy