December 2019 Summary

In Brief:
Dry and fine start, the 1st to 4th being the first completely dry 4-day spell since 21st September!  Low pressure and rain returned for the next 3 weeks. Dry weather, this time mostly cloudy however, returned at the end of the month.    Average temperatures day and night.  

Temperature: [Minimum]:
Lowest: -0.3 degs C on the 2nd.   Coldest December night since 2014.
Highest: 11.8 degs C on the 27th.  

Average minimum:  6.61 degs C.   =7th coldest of the last 17 Decembers.
Nights with temperature below 5 degs C = 9. 
Nights with temperature below 0 degs C = 1.   First since February 3rd and the first time in December since 2014.

Temperature: [Maximum]:
Lowest: 7.7 degs C on the 17th.

Highest: 13.5 degs C on the 10th.  Since 2003 only 3 Decembers (2014, 2017 and 2018) have not seen a warmer day than this.

Average maximum: 11.25 degs C.  9th highest and 9th lowest of the last 17 Decembers.   Lowest since January.

Days with temperature above 20 degs C = 0.   

Days with temperature above 25 degs C = 0.  

Rainfall:
Total this month: 148.9 mm.  Driest December since 2016.  3rd driest of the last 9 Decembers (behind 2014 and 2016). 

Last month [November 2019]:  226.2 mm.
Last year [December 2018]:  209.4 mm.

Wettest day:  19.1 mm on the 12th. 

Other days with 15 mm or more:  21st (18.9 mm), 8th (17.8 mm), 18th (15.5 mm), 19th (15.0 mm).

Wettest spells:  18th to 21st: 56.4 mm and 8th to 12th: 53.7 mm.

Driest spells:  1st to 4th and 27th to 30th: dry.  27th to 31st:  No measurable rain.
Completely dry days:  9.  Most in December since 2016.
Days with no measurable rain:  12.  Most in December since 2016.

Cumulatively: Whole of 2019 = 1428.4 mm.

Whole of 2018:  1314.0 mm.  [+8.71 %].   

2nd wettest year since before 2009.  2012 = 1502.6 mm.

Thunder:
Thunder on the 8th* and 15th.  *Lightning only.

Pressure (at 2100 only):
Lowest: 977.1 mb on the 21st.  
Highest: 1030.0 mb on the 28th.