The average annual rainfall in London is 593 mm with a monthly average of 12.75 rain days per month (days with at least 0.25mm of rain). Aberystwyth, in Mid-West Wales has 1051 mm annual rainfall and 18.3 rain days per month.
come on... someone must know...
RAIN
On average it rains about 1 out of every 3 days in Ireland.
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139mm of rain per month , 11 rain days on average out of 31 days of the month. (appx 5.5inches of rain) Temp high: 31 low: 20, water temp about 30 Celsius (90 f)
On average, it rains 126 days each year in massachusetts