Weather in Watford, UK during December 2020
Round up of the weather across the UK and especially Watford in December 2020.
It was a month of thirds in the UK with a very warm middle surrounded by a cold sandwich. The CET (Central England Temperature) ended up at 4.97c which made it an average month. At one point with 10 days to go the CET was well over 2.5c above the long term average but the very cold end brought this backdown.
For those who don’t know the CET is the longest temperature instrumental series in the world. It began in 1659 and consists of a triangle of weather stations in the central part of England. Look out for an article on this in the coming months.
It was also a month of very wet weather especially in the midlands which saw extensive flooding from some named storms.
In the last week of the month, the jet stream had parked itself south of the UK which means we are on the cold side hence more chances of snow across the UK. Whether the south gets any snow it will depend on the how cold the upper air is and if it gets modified by the north sea which after warm autumn it still has some way to cool down.
It has been a predominantly northerly month but with a week of winds from the south which brought the temperatures up a lot and especially warm nights. Some places had a decent covering of snow at the beginning and end of the month. Which makes up for not seeing any snow last winter across the UK.
14.9 °C was the maximum temperature in December it was recorded at Prestatyn (Clwyd) on the 18th. On the 30th a minimum temperature of -10.2 °C was recorded at Dalwhinnie (Inverness-shire). At Honister Pass (Cumbria) and on the 27th 109 mm of rain fell. On the 27th a wind gust of 106 mph was recorded at the Needles (Isle of Wight). A depth of 18 cm of snow was recorded at Loch Glascarnoch (Ross & Cromarty) on the 31st.
It has turned out to be an average month temperature-wise with the highest temperature at 13c on the 21st. The lowest was -2.3c on the 7th, Watford also had 9 air frosts. These mainly occurred at the end of the month, two days had snow falling.
The rainfall during the month has been around average with 40.5mm with the wettest day on the 26th. Also, 19 days were rainy, it was windy on the 26th with a high gust of 27.3 mph.
Watford is a market town just a few miles north of London. I have lived in Watford since 1983 and this is where I have my weather station.
Below is a beautiful winter sunset in Watford. It is made up of a time-lapse over a few hours.
Looking ahead to January
Long-range computer models have been suggesting for weeks that January is going to be cold to very cold. Though there may be a warm-up mid-month. But with also the SSW (Sudden Stratospheric Warming) event occurring at the beginning of the month, this could be the catalyst for even colder weather.
Summary for December 2020 in Watford
This information is gathered from my weather station which is located in my garden.
Mean (1 minute) 5.6
Mean (min+max) 5.6
Mean Minimum 3.1
Mean Maximum 8.1
Minimum -2.3 day 07
Maximum 13.0 day 21
Highest Minimum 10.0 day 18
Lowest Maximum 1.2 day 31
Air frosts 9
Total for month 40.5
Wettest day 7.8 day 26
High rain rate 25.2 day 23
Rain days 19
Dry days 12
Highest Gust 27.3 day 26
Average Speed 1.3
Wind Run 986.1 miles
Gale days 0
Maximum 1025.6 day 25
Minimum 963.7 day 27
Days with snow falling 2
Days with snow lying at 0900 0
Thanks for reading, this is the first of a monthly article on the weather in Watford which is located in the UK. Together with statistics and notable weather that occurred in the UK during the month. January’s round up would also include some new worthy weather from around the world. All photographs were taken by myself.