Tuesday 27 June 2017

May 2017 Summary

In Brief:

Mostly fine for the first 10 days, unsettled for the next 10, fine again during the 4th week and unsettled at the end.   Night-time temperatures above average, and daytime temperatures below average.
Prolonged heavy and thundery rain in the vicinity on the 18th.
Persistent lightning to the east for a time during the early hours of the 27th.

Temperature: [Minimum]:
Lowest:  5.6 degs C on the 10th.  Every May since 2013 has had a colder night than this.
Highest:  14.6 degs C on the 31st.  Highest May minimum since 2012.
Average minimum:  10.09 degs C.  5th highest of the last 14 Mays.
Nights with temperature below 5 degs C = 0.
Nights with temperature below 0 degs C = 0.

Temperature: [Maximum]:
Lowest:  11.3 degs C on the 6th.  Equal to April.  The coldest May day since 2005 [= with 2015].
Highest:  21.0 degs C on the 26th.  Lowest May maximum since 2013.
Average maximum:  16.39 degs C.  2nd coldest of the last 14 Mays [behind 2013].
Days with temperature above 20 degs C = 3.
Days with temperature above 25 degs C = 0.

Rainfall:
Total: 77.0 mm.  2nd driest month of 2017 so far.  Wettest May since 2014.
April 2017:  19.7 mm.
May 2016:  46.1 mm.

Wettest day:  16.0 mm on the 18th. [Wettest day since February 6th].
Driest spell:  No measurable rain: 20th to 26th.
Wettest spell:  49.9 mm: 12th to 19th.
Other days with  >10 mm: 15th [12.5] and 6th [12.2].

Completely dry days:  17.
Days with no measurable rain:  20.

Cumulatively:  2017:  382.9 mm.
2016:  644.5 mm.  [-40.59%].

Thunder:
18th and 27th.

Pressure:
Lowest:  989.5 mb on the 12th.  
Highest: 1029.1 mb on the 24th.

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