December 2018 Summary

In Brief:


Mostly very wet and gloomy with hardly any sunshine.  Mainly dry for the final week.  Average temperatures by day, with nights mostly above.

Temperature: [Minimum]:
Lowest: 1.5 degs C on the 28th. 
Highest:  12.2 degs C on the 2nd. 
Average minimum:  7.79 degs C.  Higher than April (7.1).  Highest for December since 2015 and 4th highest of the last 16.
Nights with temperature below 5 degs C = 6.  Fewest for December since 2015.
Nights with temperature below 0 degs C = 0. 

Temperature: [Maximum]:
Lowest: 7.5 degs C on the 13th. 
Highest: 13.3 degs C on the 2nd.  There has been a milder day than this in every December since at least 2003, except in 2014 and 2017.
Average maximum: 11.23 degs C.  9th highest of the last 16 Decembers.
Days with temperature above 20 degs C = 0.
Days with temperature above 25 degs C = 0.

Rainfall:
Total:  209.4 mm.  Wettest month since January, and 2nd wettest December of the last 11, behind 2012.
November 2018:  183.9 mm.
December 2017:  187.2 mm.

Wettest day:  35.6 mm on the 15th.  Wettest day since September 2017, and wettest December day since 2012. 
Other days with 20 mm or more:  7th [20.8 mm] and 1st [20.2 mm].
Days with 10mm < 20mm: 2nd, 5th, 18th, 21st, 23rd.
Wettest spells:  1st to 7th: 82.1 mm.  15th to 24th: 101.2 mm.

Driest spell: 25th to 31st: 0.6 mm.
Completely dry days:  4.  Equal fewest since March.
Days with no measurable rain:  9.

Cumulatively: 2018 = 1314 mm [2nd wettest year of the last 10 (behind 2012)].
2017:  1149.8 mm.  [+14.28%].

Thunder:
None this month.

Pressure:
Lowest:  997.3 mb on the 15th.  
Highest:  1042.3 mb on the 31st.