Wednesday, 30 October 2019

September 2019 Summary

In Brief:
Mainly fair for the first three weeks, with some interruptions.  Very wet last ten days.   Daytime temperatures fairly stable.  Above average night-time temperatures.

Temperature: [Minimum]:
Lowest: 9.9 degs C on the 8th.   Every September since 2013 has had a lower temperature than this.
Highest: 16.8 degs C on the 12th.  Warmest for September since 2016. 
Average minimum:  13.31 degs C.   Warmest for September since 2016 and 3rd warmest since before 2007. (2013 and 2016 were higher).
Nights with temperature below 5 degs C = 0.
Nights with temperature below 0 degs C = 0.

Temperature: [Maximum]:
Lowest: 17.2 degs C on the 9th and 29th.  Every September since 2014 has had a cooler day than this.
Highest: 21.3 degs C on the 3rd. 
Average maximum: 18.96 degs C.  Highest for September since 2014, but 6th coolest of the last 16 Septembers.
Days with temperature above 20 degs C = 6.   Most for September since 2016.
Days with temperature above 25 degs C = 0.  

Rainfall:
Total this month (until 29th): 145.1 mm.  3rd wettest September since 2008, after 2016 and 2017.  Wettest month since December 2018.
Last month [August 2019]:  119.7 mm.
Last year [September 2018]:  68.6 mm.

Wettest day:  27.5 mm on the 28th.  
Other days with 10 mm or more (until 29th):  24th (25.1 mm), 9th (16.5 mm), 22nd (14.1 mm), 23rd (13.5 mm) and 29th (10.8 mm).
Wettest spell:  21st to 29th: 114.9 mm.   

Driest spell:  14th to 20th:  No measurable rain.
Completely dry days:  10.  Fewest since March.
Days with no measurable rain:  13.  Equal fewest since April.

Cumulatively to September: 2019 = 821.9 mm.
2018:  848.6 mm.  [-3.15 %].   2nd driest January to September period of the last six.

Thunder:
None this month. 

Pressure (at 2200 only):
Lowest: 1001.9 mb on the 24th.  
Highest: 1038.2 mb on the 13th.

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