Historical Ranked Daily Data for May - Mean Dew Point / °C
Weather Variable:
| Highest | ||
| Rank | Value | Date |
| 1 | 16.1 | 27 May 2018 |
| 2 | 16.0 | 28 May 2018 |
| 3 | 15.9 | 31 May 2018 |
| 4 | 15.8 | 25 May 2026 |
| 5 | 15.5 | 24 May 2012 |
| 6 | 15.2 | 26 May 2018 |
| 7 | 14.8 | 23 May 2026 |
| 8 | 14.6 | 24 May 2026 |
| 9 | 14.6 | 29 May 2017 |
| 10 | 14.4 | 11 May 2016 |
| 11 | 14.4 | 28 May 2026 |
| 12 | 14.1 | 10 May 2012 |
| 13 | 13.9 | 30 May 2018 |
| 14 | 13.9 | 31 May 2025 |
| 15 | 13.8 | 26 May 2026 |
| 16 | 13.7 | 10 May 2016 |
| 17 | 13.7 | 27 May 2026 |
| 18 | 13.7 | 30 May 2025 |
| 19 | 13.7 | 23 May 2012 |
| 20 | 13.6 | 17 May 2017 |
| 21 | 13.5 | 30 May 2019 |
| 22 | 13.5 | 16 May 2017 |
| 23 | 13.4 | 29 May 2018 |
| 24 | 13.1 | 29 May 2025 |
| 25 | 13.1 | 26 May 2019 |
| Lowest | ||
| Rank | Value | Date |
| 1 | -2.6 | 02 May 2013 |
| 2 | -0.2 | 11 May 2010 |
| 3 | -0.2 | 03 May 2011 |
| 4 | 0.1 | 12 May 2010 |
| 5 | 0.3 | 11 May 2020 |
| 6 | 0.5 | 03 May 2014 |
| 7 | 0.6 | 13 May 2010 |
| 8 | 0.7 | 05 May 2016 |
| 9 | 0.8 | 01 May 2013 |
| 10 | 0.9 | 01 May 2015 |
| 11 | 0.9 | 23 May 2013 |
| 12 | 1.0 | 04 May 2010 |
| 13 | 1.0 | 12 May 2012 |
| 14 | 1.1 | 01 May 2016 |
| 15 | 1.4 | 04 May 2011 |
| 16 | 1.4 | 12 May 2020 |
| 17 | 1.5 | 03 May 2010 |
| 18 | 1.5 | 02 May 2011 |
| 19 | 1.5 | 03 May 2013 |
| 20 | 1.6 | 07 May 2021 |
| 21 | 1.6 | 04 May 2016 |
| 22 | 1.8 | 05 May 2019 |
| 23 | 1.9 | 03 May 2016 |
| 24 | 1.9 | 06 May 2012 |
| 25 | 1.9 | 16 May 2012 |
Ranked daily data from 2009 to present for London, NW3. For Mean Dew Point, there are 558 valid values in May.