The word llovían is the imperfect form of llover in the third person plural.
See the full llover conjugation

llover

GRANIZO, que puede ser granizo o misiles llovían sobre la tierra.
HAIL, which may be hailstones or missiles raining down upon the earth.
Cuando finalmente lo logramos, nos llovían más botellas y ladrillos.
By the time we pulled away, more bottles and bricks were coming.
Y durante medio día los sitios de donación estuvieron arriba. Y las donaciones llovían de todo el mundo.
And within half a day donation sites were up, and donations were pouring in from all around the world.
El día siguiente lo más inesperado fue que nos llovían preguntas de periódicos y reporteros de todo el mundo.
The next day, what was totally unexpected was that we were deluged by inquiries from newspapers, journalists from all around the world.
Ayer a las seis llovían chuzos de punta, así que no dimos nuestro acostumbrado paseo.
Yesterday at six it was pouring, so we didn't take our usual walk.
Al principio llovían quejas por todos lados, en los periódicos, en las radios.
At first, complaints were coming from everywhere: radio, newspapers, etc.
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