The return of frequent Atlantic weather systems brought repeated spells of rain, with total rainfall for autumn reaching around 449mm – well above the long-term average.
Alongside the rainfall, autumn temperatures in Northern Ireland were around 0.35C above the seasonal average.
While not record-breaking, this continued the trend of milder conditions seen throughout the year.
Sunshine was also in short supply during the autumn months.
With just 80% of its average sunshine it was the fifth dullest autumn on record and the dullest since 1983.
Northern Ireland was affected by several named storms during the season.
Storm Amy, which arrived at the start of October, brought the most significant impacts locally.
Strong winds battered exposed coastal areas, with a weather station at Magilligan in County Londonderry recording gusts of 92mph (148km/h) – a new Northern Ireland record for October.