Steventon Weather

DECEMBER 2020

December began with a pleasant sunny day after a ground frost in the mornin, but a sharp fall in the barometer brought unsettled conditions for the following three days, with a little rain. A high pressure system then moved in with early fog and lower temperatures until the end of the first week. Maximum temperatures ranged from 7.8°C on 5th to 2.8°C on 7th and nights fell between 4.0°C on 3rd and -1.1°C on 8th. The wind was light N-NNE.

However, this all changed on 8th as milder but cloudy, damp conditions took over for the next two weeks. Measurable rain fell on all days bar one but was in the low single figures, apart from 9.9mm on 13th. The pressure remained high, on average with dips when weak fronts moved through. There were often sunny spells between the showers. Daytime temperatures during this period mostly reached low double figures with a maximum for the month of 13.2°C on 21st. Nights ranged from 2.0°C on 13th to 10.6°C on 18th, the mildest night of the month. The wind was light to moderate S-SE. This wet period ended on 22nd with 15.1mm.

On 26th another 13.4mm fell, caused by storm "Bella" (plus 0.7mm on 31st) to bring the month's total to 76.8mm over 20 days, 20% above average, less than 2019 but more than 2018. This makes it the 6thabove average month for the year and brings the year's total to 821.9mm, 120.5% of average and the wettest since 2014.

Apart from "Bella", anticyclonic conditions dominated the last week and -1.7°C on 31st &1st were the coldest nights of the month. There were slight air frosts on the last three mornings.

Overall, December weather was in three parts with a long, damp to wet period in the middle and mainly dry beginning and end. Sunshine was scarce, Making the short days seem even shorter. The temperature was 0.9°C above average. The year as a whole was the warmest since my records began in 1981 and 1.57°C above my 25-year average.

Mike Wilkins

25 year Rainfall averages are from 1992-2016
30 year Temperature averages are from 1981-2010

NOVEMBER 2020

November began as October had ended; mild and wet. Rain, mainly overnight on 1st and 2nd was 3.5mm & 8.4mm respectively. There were sunny periods during the day and the temperatures reached 16.5°C, (the maximum for the month) on 1st and 16.2°C on 2nd. The wind was fresh S-SW

A sharp rise of the barometer signalled the arrival of brighter, colder weather with ground frosts on 4th - 6th, that on the 4th being the first for the autumn and the latest since 2013. Night time temperatures fell to low single figures, down to 0.2°C on 6th, which was to be the coldest for the month. There were long sunny periods during the day. The very light wind was variable

Unsettled conditions returned from 8th - 13th, with brief showers and mainly overcast skies

On 14th heavy rain arrived with a moderate SE-S wind and continued overnight, totalling 22.9mm the only significant fall during the month. It continued unsettled with sunny spells and the occasional shower until 21st. The temperature reached the low teens on most days and nights fell between 11.6°C & 2.8°C

The rest of the month was dominated by high pressure and light winds from all directions. Until 25th the temperature reached low teens but with clear night skies it then fell to low single figures, the lowest for the month being 4.4°C on 27th, which also recorded the second lowest night at 0.8°C. There was early fog on 22nd and 26th - 29th and ground frost on 23rd & 26th

In the second half of the month "measurable" rain was recorded on 10 days but only 2 days were over 1mm. Consequently, the total for November was just 54.5mm, 72.7% of my 25-year average, the driest November since 2013

The average temperature was 1.9°C above my 30-year average making it the warmest November since 2015

In summary, November was a pleasantly mild, dry month with mainly light or moderate winds, a reasonable amount of sunshine and no real cold spells

Mike Wilkins

25 year Rainfall averages are from 1992-2016
30 year Temperature averages are from 1981-2010

Weather Summary table for 2020 at Steventon, Oxfordshire.

30 year temperature averages for Steventon are from 1981-2010
Oxford rainfall averages are from 1992-2016

Download as 'pdf'tl_files/ANS/logos/iconPDF.gif

 

MonthTemperature
°C
Rainfall
mm%
25yr avg.
MaxMinMonthly Average30yr
Avg.
>30yr
Avg.
 25yr
avg.
January 13.0 -1.7 9.96 4.57 2.39 66.3 66.4 99.8
February 13.2 -0.9 7.19 4.69 2.50 112.7 45.9 245.3
March 15.9 -0.5 7.60 6.86 0.74 48.9 41.9 116.6
April 24.2 0.1 11.99 9.17 2.82 47.8 53.0 90.2
May 26.2 1.6 14.69 12.64 2.05 1.4 60.2 2.3
June 31.9 7.6 17.06 15.82 1.24 65.3 47.7 136.8
July 35.2 8.9 18.09 17.91 0.18 30.4 49.8 79.1
August 34.5 10.7 19.64 17.43 2.21 101.9 56.1 181.6
September 28.6 4.8 15.69 14.50 1.19 36.1 51.8 69.8
October 17.6 6.0 11.44 10.76 0.68 170.8 70.0 244.o
November 16.5 0.2 8.88 6.94 1.94 54.5 74.9 72.7
December 13.2 -1.7 5.65 4.76 0.89 76.8 64.1 119.8
Year 35.5 -1.7 12.07 10.50 1.57 821.9 682.0 120.5

Summary data from Mike Wilkins, January 2021