A warmer November than usual confirmed the 2021 Autumn as the 3rd warmest on record for the UK and warmest on record in Northern Ireland.
The meteorological year starts in December which is why December appears as the 1st data point in the charts below. More information on the layout of the charts can be found in this post. Points lying between the upper and lower deciles are shown as open black circles, points lying between the lower/upper deciles and minimum/maximum are shown as solid black circles and any month with a new record is shown as solid black squares. All data is supplied by the Met Office and can be found here.
Every month I update 7 charts in all. I rotate which 6 appear in the deck above and 
plot the 7th as a separate chart here. Between October & March, Sunshine (chart G) is shown here since that is of least interest in these months.
How abnormal was November 2021?
Chart H displays my UK Weather Abnormality Index (see my May 2019 post for details). The closer to zero this index is, the less abnormal and thus more “average” a month is. The higher it is, the more abnormal the month is. When the index is over 100%, we can describe the month as unusual in some way.
The abnormality index was 63% this month, close to the median.
Regional Variations
November marks the end of the meteorological autumn. I do not track regional statistics every month but I do track temperature by season for each region so I can update the regional temperature chart here. This shows the Z-Score for each region for the 2021 autumn. A Z-Score is simply the regional temperature minus the long term average for that region divided by the long term standard deviation for that region. Doing this, gets around the issue that each region is different on average whereas z-scores all have the same scale, namely number of standard deviations above or below the long term average.
It was the 3rd warmest autumn in the UK overall which was replicated in most regions with the notable exception of Northern Ireland where it was the warmest on record.
PS: If you bookmark this link, it will be refreshed with the latest month’s data. I usually post the update in the first week of each month.
Click the relevant month to see what the weather was back then. Months highlighted in bold had an abnormality index exceeding 100% indicating unusual weather. Alternatively click the Weather Tracker hash tag below this post to see a list of all such posts.
- Click here for the latest month.
- 2021 – January, February, March, April, May, June, July, August, September, October, November, December
- 2020 – January, February, March, April, May, June, July, August, September, October, November, December
- 2019 – January, February, March, April, May, June, July, August, September, October, November, December
- 2018 – January, February, March, April, May, June, July, August, September, October, November, December
- 2017 – January, February, March, April, May, June, July, August, September, October, November, December
For analysis of trends by seasons, please click on the relevant season from this list or the Weather Trends hashtag below this post.
- 2021 – Winter, Spring, Summer, Autumn
- 2020 – Winter, Spring, Summer, Autumn
- 2019 – Winter, Spring, Summer, Autumn
- 2018 – Winter, Spring, Summer, Autumn
- 2017 – Winter, Spring, Summer, Autumn
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