Historical Ranked Daily Data for May - Maximum Dew Point / °C
Weather Variable:
| Highest | ||
| Rank | Value | Date |
| 1 | 19.8 | 28 May 2018 |
| 2 | 19.4 | 27 May 2018 |
| 3 | 18.8 | 25 May 2026 |
| 4 | 18.8 | 11 May 2016 |
| 5 | 18.5 | 26 May 2018 |
| 6 | 18.2 | 31 May 2018 |
| 7 | 17.8 | 28 May 2026 |
| 8 | 17.6 | 24 May 2012 |
| 9 | 17.2 | 24 May 2026 |
| 10 | 17.0 | 30 May 2018 |
| 11 | 16.9 | 23 May 2026 |
| 12 | 16.9 | 29 May 2017 |
| 13 | 16.8 | 23 May 2012 |
| 14 | 16.4 | 24 May 2018 |
| 15 | 16.2 | 17 May 2024 |
| 16 | 16.2 | 17 May 2017 |
| 17 | 16.2 | 29 May 2009 |
| 18 | 16.1 | 12 May 2024 |
| 19 | 16.1 | 27 May 2017 |
| 20 | 16.0 | 26 May 2026 |
| 21 | 16.0 | 26 May 2019 |
| 22 | 15.9 | 27 May 2026 |
| 23 | 15.9 | 16 May 2017 |
| 24 | 15.8 | 29 May 2025 |
| 25 | 15.7 | 16 May 2022 |
| Lowest | ||
| Rank | Value | Date |
| 1 | 0.8 | 02 May 2013 |
| 2 | 1.4 | 11 May 2010 |
| 3 | 1.7 | 11 May 2020 |
| 4 | 2.4 | 03 May 2014 |
| 5 | 2.8 | 12 May 2010 |
| 6 | 2.8 | 23 May 2013 |
| 7 | 2.8 | 01 May 2015 |
| 8 | 3.1 | 06 May 2012 |
| 9 | 3.4 | 04 May 2010 |
| 10 | 3.6 | 07 May 2010 |
| 11 | 3.6 | 05 May 2019 |
| 12 | 3.6 | 14 May 2020 |
| 13 | 3.7 | 13 May 2010 |
| 14 | 3.7 | 07 May 2021 |
| 15 | 4.0 | 03 May 2010 |
| 16 | 4.0 | 26 May 2013 |
| 17 | 4.1 | 10 May 2010 |
| 18 | 4.1 | 12 May 2012 |
| 19 | 4.1 | 16 May 2012 |
| 20 | 4.1 | 13 May 2020 |
| 21 | 4.3 | 09 May 2017 |
| 22 | 4.3 | 12 May 2020 |
| 23 | 4.5 | 03 May 2011 |
| 24 | 4.5 | 04 May 2011 |
| 25 | 4.5 | 03 May 2013 |
Ranked daily data from 2009 to present for London, NW3. For Maximum Dew Point, there are 558 valid values in May.