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The average day light hours per day in St Lucia in February are 11.7 and there are 4.7 hours of sunshine per day on average during February making it a sunny month that is overcast at times. The ultraviolet index in St Lucia in February is typically 11.6 during February.
Even though it only happens on an average of 10% of days, temperatures can sometimes rise above 30Â°C and fall below 22Â°C in St Lucia in December. The hottest temperature ever recorded on the island at this time of year is 33Â°C, whilst the coldest temperature ever registered here during this month is 16Â°C.he average sea temperature for St Lucia stays pleasantly warm throughout the year. In December, itâs 28Â°C â thatâs the same as last month â which is certainly warm enough for a swim. Thanks to its tropical climate, St Lucia remains humid all-year-round.