The 2026 meteorological year in the UK began with a warmer and less frosty December than usual but otherwise the weather in this month was unremarkable.
The Latest Month’s Weather in 8 Charts
The meteorological year starts in December which is why December appears as the 1st data point in the charts below. All data is supplied by the Met Office and can be found here.
I decided it was time to refresh the layout of the charts. The dashboard below now shows all 8 charts I show each as a single graphic. The middle bottom block explains why some data points are in black, points out that the charts for Sunshine & Frost are swapped around according to the seasons and how the abnormality index is calculated.
In July 2025, the Met Office extended their historical frost days data back to 1931.
How abnormal was December 2025?
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 90% this month which is just above the median of the last 94 years. For some reason, December differs from other months in terms of the abnormality index having a median this high rather than the ~60% typically seen in other months.
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 below 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.
- 2025 – January, February, March, April, May, June, July, August, September, October, November, December
- 2024 – January, February, March, April, May, June, July, August, September, October, November, December
- 2023 – January, February, March, April, May, June, July, August, September, October, November, December
- 2022 – January, February, March, April, May, June, July, August, September, October, November, December
- 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.
- 2025 – Winter, Spring, Summer, Autumn
- 2024 – Winter, Spring, Summer, Autumn
- 2023 – Winter, Spring, Summer, Autumn
- 2022 – Winter, Spring, Summer, Autumn
- 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
For analysis of trends by year, please click on the relevant year from this list –
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