Weather review – May 2013

May 2013 was the wettest and coldest May recorded at Bracken House. The average temperature was 0.8°C below the monthly mean, and the rainfall was 20.5 millimetres higher than average.

The average temperature for the month was 10.2°C, with the highest being 20.6°C recorded on the 7th at 14:10, and the lowest being 1.1°C recorded at 04:30 on the first day of the month. The maximum monthly temperature was the lowest maximum ever recorded in May. There was 124.8 hours of sunshine in the month, which was 19.3 hours less than May 2012. May was also the fifth consecutive month of below average temperatures.

There were 18 rain days in the month, a record for May, and a total of 62.0 millimetres was recorded, also a May record. The wettest day was the 28th on which 11.4 millimetres of rain fell, this was the wettest May day recorded at Bracken House. Evapotranspiration for the month was 87.1 millimetres, 5.7 millimetres lower than May 2012.

The average barometric pressure for the month was 1010.7 millibars. The highest pressure recorded was 1028.8 millibars at 00:18 on the 1st, with the lowest being 984.3 millibars at 05:30 on the 15th, another May record.

Winds were average for May. The average wind speed was 4.7 mph and the average gust speed was 7.5 mph. The highest wind speed recorded was 21.9 mph from 293° (WNW) at 15:43 on the 13th. The maximum gust speed was 29.9 mph, two minutes earlier, also from 293° (WNW).

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