Historical Ranked Daily Data for May - Mean Temperature / C
Weather Variable:
| Highest | ||
| Rank | Value | Date |
| 1 | 21.4 | 21 May 2020 |
| 2 | 21.1 | 20 May 2020 |
| 3 | 21.1 | 31 May 2025 |
| 4 | 20.9 | 24 May 2010 |
| 5 | 20.8 | 28 May 2012 |
| 6 | 20.7 | 27 May 2018 |
| 7 | 20.5 | 26 May 2017 |
| 8 | 20.3 | 27 May 2012 |
| 9 | 20.2 | 24 May 2017 |
| 10 | 20.2 | 24 May 2012 |
| 11 | 20.1 | 25 May 2017 |
| 12 | 20.1 | 25 May 2012 |
| 13 | 20.1 | 08 May 2016 |
| 14 | 19.8 | 01 May 2025 |
| 15 | 19.8 | 30 May 2025 |
| 16 | 19.8 | 26 May 2020 |
| 17 | 19.7 | 26 May 2012 |
| 18 | 19.6 | 26 May 2018 |
| 19 | 19.6 | 27 May 2017 |
| 20 | 19.4 | 17 May 2022 |
| 21 | 19.4 | 19 May 2014 |
| 22 | 19.4 | 23 May 2010 |
| 23 | 19.4 | 19 May 2020 |
| 24 | 19.2 | 12 May 2024 |
| 25 | 19.2 | 28 May 2018 |
| Lowest | ||
| Rank | Value | Date |
| 1 | 6.8 | 03 May 2010 |
| 2 | 6.8 | 11 May 2010 |
| 3 | 6.8 | 06 May 2012 |
| 4 | 6.8 | 24 May 2013 |
| 5 | 6.9 | 12 May 2010 |
| 6 | 7.0 | 04 May 2019 |
| 7 | 7.1 | 05 May 2021 |
| 8 | 7.1 | 04 May 2010 |
| 9 | 7.2 | 05 May 2012 |
| 10 | 7.3 | 06 May 2021 |
| 11 | 7.5 | 15 May 2012 |
| 12 | 7.6 | 01 May 2021 |
| 13 | 7.8 | 05 May 2019 |
| 14 | 7.8 | 02 May 2010 |
| 15 | 7.8 | 04 May 2012 |
| 16 | 7.8 | 11 May 2020 |
| 17 | 7.9 | 08 May 2010 |
| 18 | 7.9 | 13 May 2010 |
| 19 | 8.1 | 23 May 2013 |
| 20 | 8.3 | 03 May 2012 |
| 21 | 8.4 | 09 May 2010 |
| 22 | 8.5 | 14 May 2020 |
| 23 | 8.6 | 01 May 2015 |
| 24 | 8.6 | 07 May 2010 |
| 25 | 8.6 | 10 May 2010 |
Ranked daily data from 2009 to present for London, nw3. For Mean Temperature, there are 527 valid values in May