More than 200mm of rain fell last month, making it the wettest October since Guernsey Water starting taking records.
In total, 215mm (8.5 inches) of rainfall was recorded last month, which is more than double the climactic mean since 1971 of 95mm (3.7 inches).
It also brings the total rainfall this year up to 784.3mm, which is the highest since 2014.
Pictured: How October's rainfall compares to previous years.
October began with Storm Alex, which caused some localised flooding with heavy showers that set the tone for the month.
Water reserves increased by 338 Mega-Litres as a result, taking the overall volume in storage up to 3,973ML, which equates to 90.6% of maximum capacity across the island's reservoirs.
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