{"id":6470,"date":"2025-09-07T20:35:17","date_gmt":"2025-09-07T19:35:17","guid":{"rendered":"https:\/\/marriott-stats.com\/nigels-blog\/?p=6470"},"modified":"2025-12-03T20:20:18","modified_gmt":"2025-12-03T20:20:18","slug":"uk-weather-tracker-august-2025","status":"publish","type":"post","link":"https:\/\/marriott-stats.com\/nigels-blog\/uk-weather-tracker-august-2025\/","title":{"rendered":"UK Weather Tracker #103 – August 2025"},"content":{"rendered":"

It was the 8th warmest August on record in the UK.\u00a0 When combined with the 5th warmest July and the 2nd warmest June, the result was the warmest summer on record.\u00a0 Otherwise, the weather on average in the UK continues to be unremarkable in terms of rainfall and sunshine but that disguises some significant regional variations.
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The meteorological year starts in December which is why December appears as the 1st data point in the charts below.\u00a0 More information on the layout of the charts can be found in this pos<\/a>t.\u00a0 Points lying between the upper and lower deciles are shown as open black circles, points lying between the lower\/upper deciles and the minimum\/maximum respectively are shown as solid black circles and any month with a new record is shown as solid black squares.\u00a0 All data is supplied by the Met Office and can be found here<\/a>.<\/p>\n

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Every month I update 7<\/strong> charts in all.\u00a0 I rotate which 6<\/strong> appear in the deck above and \"\"plot the 7th<\/strong> as a separate chart here.\u00a0 Between March & October, Frost (chart G) is shown here since that is of least interest in these months.<\/p>\n

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How abnormal was August 2025?<\/strong><\/span><\/h5>\n

\"\"Chart H displays my UK Weather Abnormality Index<\/strong><\/span> (see my May 2019 post for details<\/a>).\u00a0 The closer to zero this index is, the less abnormal and thus more “average<\/em>” a month is.\u00a0 The higher it is, the more abnormal the month is.\u00a0 When the index is over 100%<\/strong>, we can describe the month as unusual in some way.<\/p>\n

In July 2025<\/a>, the Met Office extended their historical frost days data back to 1931.\u00a0 This means I can calculate abnormality indexes for the last 94<\/strong> years instead of the last 65 years.<\/p>\n

The abnormality index was 74% <\/strong>this month which lies between the median and upper quartile of the last 94<\/strong> years..<\/p>\n

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Regional Variations – Summer 2025<\/strong><\/span><\/h5>\n

\"\"August marks the end of the meteorological summer.\u00a0 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.<\/p>\n

This shows the Z-Score for each region for the 2025 summer<\/strong>.\u00a0 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.\u00a0 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.<\/p>\n

The 2025 summer was the warmest on record in all regions except the North West corner of the UK spanning Northern Ireland, West & North Scotland.\u00a0 Relative to their long term averages, the east of the UK experienced the warmest summers.\u00a0 For more details about the 2025 summer. click on the link provided in the list below.<\/p>\n

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PS: If you bookmark this link<\/a>, it will be refreshed with the latest month’s data.\u00a0 I usually post the update in the first week of each month.<\/em><\/p>\n

Click the relevant month below to see what the weather was back then.\u00a0 Months highlighted in bold had an abnormality index exceeding 100%<\/strong> indicating unusual weather.\u00a0 Alternatively click the Weather Tracker<\/a> hash tag below this post to see a list of all such posts.<\/p>\n