The Met Office at Ronaldsway says March had warmer days than usual but colder nights, with the least rain for the month since 1990.
According to data collected over the course of last month, it was also the least windy March on record.
The figures show the average day-time temperature reached 9.4 degrees Celsius, slightly above normal.
But the mean night-time minimum temperature was 3.4 Celsius, a full degree below the long-term average.
That led to a total of 13 ground frosts, the most during the month since 2002.
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