Friday 25 May 2018

April 2018 Summary

In Brief:
Unsettled, wet and cool to start, with low pressure.  Then plenty of dry weather, although still rather cool by day.   Warm and sunny with high pressure during the third week.  Unsettled again at the end.

Temperature: [Minimum]:
Lowest:  0.2 degs C on the 5th.  Equal coldest April night at this location since 2008.
Highest:  10.9 degs C on the 17th.  Warmest April night since 2014.
Average minimum:  7.1 degs C.  7th lowest of the last 15 Aprils but highest since 2014.
Nights with temperature below 5 degs C = 3. Fewest for April since 2011.
Nights with temperature below 0 degs C = 0.

Temperature: [Maximum]:
Lowest:  9.4 degs C on the 1st.  Coldest April day since 2013.  Max only reached in the evening.
Highest:  20.8 degs C on the 19th.  Warmest day since 28 August 2017, and warmest April day since 2015.
Average maximum:  14.57 degs C.  4th lowest of the last 15 Aprils but 4th highest of the last 7.
Days with temperature above 20 degs C = 1.   1st in April since 2015.
Days with temperature above 25 degs C = 0. 

Rainfall:
Total: 95.8 mm.  Wettest April since 2012, but less than half the amount of rain that fell in March.
March 2018:  195.1 mm.
April 2017:  19.7 mm.

Wettest day:  31.0 mm on the 1st.   Wettest day since 3 September 2017 and wettest April day since 2012.
Other days with >10 mm: 20.9 mm [27th].  Over half the month's total rain fell on the 1st and 27th only.
Wettest spells: 1st to 7th: 49.8 mm;  24th to 27th: 28.8 mm.  
Driest spell: 18th to 23rd: No measurable rain. 
Completely dry days:  15.  Most since May 2017.
Days with no measurable rain:  18.  Most since July 2017.
Cumulatively:  2018 = 599.8 mm.
2017:  305.9 mm.  [+96.08%].

Thunder:
None this month.

Pressure:
Lowest:  983.0 mb on the 4th.  
Highest: 1028.3 mb on the 20th.

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