Although, overall, a rather disappointing month---all the more so by immediately following a stunningly good month---May temperatures were actually very close to the long-term average values. The mean maximum temperature was only 0.3 degrees below normal & the mean minimum temperature was 0.1 above.
The month's highest temperature was only 19.5 (on the 7th ), compared with 21.2 on April 10th. May's lowest temperature was -2.9 on the 4th, whereas April was never lower than -1.1 degrees. May saw 4 air frosts & 11 ground frosts. No record temperature extremes for May were broken this year.
Rainfall was significantly above normal, its 92 mms being 151% of the long-term average, making it the wettest May since 2002. Thunder was heard at 1530hrs on the 9th & there was a slight snow cover on Ben Vrackie on the 20th.
B.G. 01/06/11
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