The average rainfall value for San Guillermo Isabela over the past 30 years is 3463 mm (millimetre).
In city of San Guillermo Isabela, the rainfall in January is 485 mm; The rainfall in February is 352 mm; The rainfall in March is 257 mm; The rainfall in April is 211 mm; The rainfall in May is 198 mm; The rainfall in June is 218 mm; The rainfall in July is 186 mm; The rainfall in August is 137 mm; The rainfall in September is 189 mm; The rainfall in October is 267 mm; The rainfall in November is 460mm; The rainfall in December is 503 mm.
Rainfall is the fall of atmospheric moisture in the form of water due to gravity. Rainfall does not occur unless cloud droplets become so large due to coalescence that the air becomes unable to hold them.
Address: San Guillermo, Isabela, Philippines.