December 2017 and Review 2017

Weather Report – December 2017 and Review 2017

In Plymtree the weather during December was mostly unsettled and generally mild with just the occasional short cold snap. Some of the showers on the 8th and the 13th were wintery but nothing lay. However, daily rainfall totals were generally not significant with only 4 days when totals exceeded 10mm.The total rainfall I measured for the month was 105.0mm. The average (1981-2010) at Dunkeswell Airfield is 121.2mm. This means that we received 87% of the Dunkeswell average. The wettest day of December was the 9th with 17.5mm. There were 14 rain days (rainfall ≥ 1mm), which compares to an average of 14.9 days for Dunkeswell but only 6 days with no measurable rainfall. The highest temperature I recorded during December was 12.9°C on the 30th. The lowest temperature, -5.7°C was recorded on the 12th. As mentioned before, all daily measurements are made at 0900GMT each day and the figures attributed to the previous day apart from minimum temperatures which are recorded against the date they are read. This is standard World Meteorological Organisation (WMO) practice. It was generally quite a windy month and there were 15 days when a gust of more than 20mph was recorded by Pete Draper at Normans Green. The strongest wind during December occurred during the morning of the 10th when a gust of 41.8mph was recorded.

My total rainfall for 2017 was 818.4mm, which compares to an average of 1065.3mm for Dunkeswell or 77%. March, July, August and September were the only months that had rainfall totals above the Dunkeswell average. The drier than average 2017 followed on from both a drier than average 2015 and 2016 when I recorded a total of 862.4mm and 806.2mm respectively or 81% and 76% of the Dunkeswell average. The highest daily rainfall total was recorded on the 30th April when 32.0mm fell (0900 GMT on 30th to 0900 GMT on 1st May). The highest temperature of 2017 was 32.6°C (90.7°F) recorded on the 20th June and the lowest -8.1°C recorded on 3rd January. The strongest wind recorded by Pete Draper during 2017 was on the afternoon of the 21st October with a gust of 43.4mph. My maximum wind speed was 32.2mph on 23rd February, in association with storm Doris.

[The difference arises because my wind speed is measured at a height of about 6' in the shelter of my back garden and Pete’s on the roof of his house and exposed to the elements].

Mike Ayles