  In order to detect a possible influence of the solar activity cycle on the
regional climate, it is established by correlations an inverse relation between
the sunspots index and the annual precipitation in the following stations:
Cenicaf\'e (1942-2014), Naranjal (1951-2014) , La Bella (1951-2014), Miguel
Valencia (1953-2014), localized in the Region of the Eje Cafetero. This
relation evidences a high statistical significance for the first three stations
being higher with the sunspot index series delayed one and two years. The
autocorrelations and the semivariograms calculated until 24 delays for the
Cenicaf\'e, Naranjal and La Bella stations' series clearly show a cycle of 10
or 11 years for the first two stations. For La Bella station it is evident the
cycle in the delays with inverse relation, delays 6 and 16. The frequency
spectra of the Cenicaf\'e, Naranjal and La Bella stations' precipitations,
obtained by the rapid Fourier transform, show contradictory results, while the
Cenicaf\'e's frequency spectrum just denotes the cycle of 11 years, the
Naranjal's frequency spectrum favors a cycle of 11 years, and La Bella
frequency spectrum shows the strong presence of cycles of 11 and 22 years. A
possible explanation for this apparent contradiction is exposed. Finally, to
prove a coupling between regional precipitation and the 11-year cycle of solar
activity, it is performed a statistical comparison between the precipitation
average of the coincident years with the minimum values of the sunspot cycle
and the precipitation average of the coincident years with the peaks of this
cycle. This comparison evidences a high statistical significance for the
Cenicaf\'e, Naranjal and La Bella stations' series. Demonstrating the influence
of the sunspot cycle in the regional precipitations. This result is useful in
the the long-term prevision of regional hydric availability.
