Historical Ranked Daily Data for May - Night Minimum (21-09) / °C
Weather Variable:
| Highest | ||
| Rank | Value | Date |
| 1 | 18.2 | 23 May 2026 |
| 2 | 17.9 | 29 May 2026 |
| 3 | 17.7 | 27 May 2026 |
| 4 | 17.2 | 22 May 2020 |
| 5 | 16.4 | 31 May 2025 |
| 6 | 16.0 | 17 May 2017 |
| 7 | 15.8 | 26 May 2026 |
| 8 | 15.7 | 25 May 2026 |
| 9 | 15.7 | 16 May 2017 |
| 10 | 15.6 | 31 May 2026 |
| 11 | 15.6 | 25 May 2012 |
| 12 | 15.4 | 30 May 2025 |
| 13 | 15.3 | 20 May 2014 |
| 14 | 15.2 | 24 May 2010 |
| 15 | 15.1 | 02 May 2025 |
| 16 | 15.1 | 26 May 2019 |
| 17 | 15.1 | 27 May 2017 |
| 18 | 15.0 | 30 May 2017 |
| 19 | 15.0 | 08 May 2011 |
| 20 | 14.9 | 26 May 2018 |
| 21 | 14.8 | 28 May 2026 |
| 22 | 14.8 | 31 May 2018 |
| 23 | 14.8 | 28 May 2018 |
| 24 | 14.8 | 10 May 2016 |
| 25 | 14.7 | 31 May 2019 |
| Lowest | ||
| Rank | Value | Date |
| 1 | 1.0 | 12 May 2010 |
| 2 | 1.0 | 12 May 2026 |
| 3 | 1.2 | 12 May 2020 |
| 4 | 1.3 | 13 May 2010 |
| 5 | 1.5 | 01 May 2016 |
| 6 | 1.5 | 11 May 2026 |
| 7 | 1.9 | 03 May 2014 |
| 8 | 2.3 | 15 May 2020 |
| 9 | 2.5 | 05 May 2010 |
| 10 | 2.7 | 02 May 2021 |
| 11 | 2.8 | 04 May 2010 |
| 12 | 2.8 | 06 May 2021 |
| 13 | 2.9 | 16 May 2013 |
| 14 | 2.9 | 01 May 2021 |
| 15 | 3.0 | 01 May 2013 |
| 16 | 3.0 | 05 May 2019 |
| 17 | 3.0 | 14 May 2020 |
| 18 | 3.1 | 11 May 2010 |
| 19 | 3.1 | 03 May 2013 |
| 20 | 3.2 | 04 May 2011 |
| 21 | 3.2 | 01 May 2018 |
| 22 | 3.6 | 12 May 2019 |
| 23 | 3.8 | 13 May 2019 |
| 24 | 3.9 | 07 May 2012 |
| 25 | 3.9 | 13 May 2012 |
Ranked daily data from 2009 to present for London, NW3. For Night Minimum (21-09), there are 558 valid values in May.