Wet wet wet – weather review of October 2020

Wintry Wood pond on a typically grey  October day  (Photo: Roger Emmens)

Weather review of October 2020

Wet Wet Wet!

October is, on average, the wettest month of the year, and this October proved it! Nationally, October 2020 was the wettest ever recorded in the UK. So it is not surprising that it was also not only our wettest October but our wettest month in our 35 years of records.

Sadly we again had recording problems, as the rain gauge appeared to be under-recording over the period 2nd to 6th October. This is a shame, as we recorded 15mm rain on 3rd on what was the UK’s wettest ever day nationally, so this is almost certainly well under the actual figure. For example, a weather station in Chelmsford recorded just over 100mm over 2nd-4th, where we recorded 52.8mm. When the 7th turned out to be a rare dry day, the rain gauge was inspected and a slug was discovered inside. Congratulations to the slug for an Everest-like ascent of the pole on which the weather station is mounted, but this wasn’t helpful to our record-keeping! The clearing of the slug also resulted in a spurious reading for 7th which was sent to the Met Office WOW network, so if you look there you’ll find an incorrect reading; but this is corrected in our data below.

So the overall net effect is that we still recorded our wettest ever October, with 164.0mm, beating the 161.7mm recorded in October 2000, and likely to be an understatement. The 23 days in which rain fell equalled the third most days for October, and the wettest recorded day on 2nd of 29.4mm was our fourth wettest October day.

Not surprisingly therefore it was also quite a breezy month, with average daily maximum gusts of 11.6mph.

At least for the first time this year, we had a month where no temperature records were broken! In fact it was a thoroughly average month as far as temperatures were concerned.

The overall monthly mean was 10.8°C, just 0.1°C below the long term average, the maximum for the month of 18.2°C was just below the long term average, and the minimum at 4.6C just above the long term average.

MeasureUnitMinimumAverageMaximumAverage minAverage maxTotal
Absolute humidityg/kg4.97.411.5
Relative humidity%559098
Wind source°4229359
Wind direction°0137359
Wind strengthmph03210.211.6
Rain daily accumulationmm0.05.329.4164
Barometric pressuremm9811009.11027.8
Solar irradiancehPa062687
UV indexW/m²0.00.33.1
Cloud base altitudem352121100
Dew point°C3.69.115.8
Heat index152644
Wind chill°C3.31018.6

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