Temperature blanket 2027 · London

London temperature blanket 2027

For a DK blanket about 110cm wide in London, plan 13 colours in 2°C steps, from below 6°C to 28°C and above. That’s about 22 balls of a 295m DK such as Stylecraft Special DK, enough in 9 of the last 10 years.

Daily highs 2016–2025 · ERA5-Land, corrected with Met Office stations · Updated 1 October 2026

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1 Jan 2025London, 202531 Dec

How London’s days split into colours

Days per 2°C colour band in London, 2016–2025, and balls of 295m DK at 10m per row
Daily high	Typical year	9 in 10 years	Balls
Below 6°C	14 days	23 days	1
6 to 8°C	16 days	21 days	1
8 to 10°C	28 days	33 days	2
10 to 12°C	41 days	46 days	2
12 to 14°C	46 days	52 days	2
14 to 16°C	35 days	40 days	2
16 to 18°C	37 days	41 days	2
18 to 20°C	26 days	37 days	2
20 to 22°C	34 days	39 days	2
22 to 24°C	37 days	42 days	2
24 to 26°C	29 days	32 days	2
26 to 28°C	13 days	16 days	1
28°C and above	12 days	24 days	1

Make it yours

Change the steps, the yarn, the width or the colours, see your blanket in any year since 2016 and print a 2027 tracker.

Plan London in the planner ↗

London’s year in numbers

Warmest month on average: July, with a typical daily high of 25.1°C.
Coldest month on average: January, 8.4°C.
Busiest colour: 12 to 14°C, about 46 days in a typical year.

Where the numbers come from

For each place we took ten full years of hourly temperatures, 2016 to 2025, from ERA5-Land, a climate reanalysis on a grid of about 9km, and kept the highest value in each UK calendar day. Grid cells run cooler than a thermometer on a lawn, so we corrected every place month by month using the gap between the grid and the three nearest Met Office stations with published monthly averages.

To check the correction we hid each of the 31 stations in turn and predicted its monthly average high from the others. The corrected figures were within 1°C in 78% of 3,720 station-months (typical error 0.6°C), against an average gap of 1.4°C before correction. A single day can still be out by more, so treat the counts as a guide to your year, not a day-by-day record.

We also compared five places with daily records from nearby weather stations (London with Heathrow, Belfast with Aldergrove, Plymouth with Mountbatten, Aberdeen with Dyce and Douglas with Ronaldsway). The total number of balls for a 2°C DK blanket matched within one ball in all five. The grid smooths the hottest days, so single colours at the warm end can come out a little short, most of all on the coast.

“Enough in 9 of 10 years” means the second-highest count of the ten years: in nine of the ten years that colour needed no more days than that.

For London, the grid cell is centred at 51.5°N, 0.1°W, corrected with Heathrow (22km), Oxford (83km), Cambridge NIAB (84km).

Data: contains modified Copernicus Climate Change Service information 2016–2025 (ERA5-Land hourly 2m temperature; neither the European Commission nor ECMWF is responsible for any use of this information). Weather data by Open-Meteo.com open data, licensed under CC BY 4.0. Met Office historic station data © Crown copyright, licensed under the Open Government Licence v3.0. Daily highs derived and bias-adjusted by HazelLoop.

More places

All UK temperature blanket towns · Yarn per colour, explained