The following table shows daily average maximum temperatures based on the 1991–2020 climatological period. Values are derived from Stevenson Screen average observations and provide an approximate guide to typical daytime temperatures for each day of the year. These aren't based on the actual daily values which is a different way of showing the data and wouldn't be so linear.
| Daily average maximum Temperatures Daily Breakdown Using the 1991 - 2020 Average | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Day | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| Deg C | Deg C | Deg C | Deg C | Deg C | Deg C | Deg C | Deg C | Deg C | Deg C | Deg C | Deg C | |
| 1 | 7.4 | 7.1 | 7.8 | 10.2 | 13.3 | 16.7 | 19.3 | 21.6 | 21.0 | 18.1 | 13.8 | 9.8 |
| 2 | 7.4 | 7.1 | 7.8 | 10.2 | 13.3 | 16.7 | 19.3 | 21.6 | 20.9 | 18.0 | 13.7 | 9.7 |
| 3 | 7.4 | 7.2 | 8.0 | 10.4 | 13.5 | 16.9 | 19.5 | 21.6 | 20.8 | 17.8 | 13.5 | 9.6 |
| 4 | 7.4 | 7.2 | 8.0 | 10.5 | 13.6 | 17.0 | 19.5 | 21.5 | 20.7 | 17.7 | 13.4 | 9.6 |
| 5 | 7.4 | 7.2 | 8.1 | 10.6 | 13.7 | 17.1 | 19.6 | 21.5 | 20.6 | 17.5 | 13.3 | 9.5 |
| 6 | 7.4 | 7.2 | 8.2 | 10.7 | 13.9 | 17.1 | 19.7 | 21.5 | 20.5 | 17.4 | 13.1 | 9.4 |
| 7 | 7.3 | 7.3 | 8.3 | 10.8 | 14.0 | 17.2 | 19.8 | 21.5 | 20.4 | 17.2 | 13.0 | 9.3 |
| 8 | 7.3 | 7.3 | 8.4 | 11.0 | 14.1 | 17.3 | 19.8 | 21.5 | 20.3 | 17.1 | 12.8 | 9.2 |
| 9 | 7.3 | 7.3 | 8.4 | 11.1 | 14.2 | 17.4 | 19.9 | 21.4 | 20.2 | 16.9 | 12.7 | 9.2 |
| 10 | 7.3 | 7.3 | 8.5 | 11.2 | 14.3 | 17.5 | 20.0 | 21.4 | 20.1 | 16.8 | 12.6 | 9.1 |
| 11 | 7.3 | 7.4 | 8.6 | 11.3 | 14.4 | 17.6 | 20.1 | 21.4 | 20.0 | 16.7 | 12.4 | 9.0 |
| 12 | 7.4 | 7.4 | 8.7 | 11.4 | 14.5 | 17.7 | 20.1 | 21.4 | 19.9 | 16.5 | 12.3 | 8.9 |
| 13 | 7.3 | 7.4 | 8.8 | 11.5 | 14.6 | 17.8 | 20.2 | 21.4 | 19.8 | 16.4 | 12.2 | 8.8 |
| 14 | 7.3 | 7.4 | 8.8 | 11.6 | 14.8 | 17.8 | 20.3 | 21.4 | 19.7 | 16.2 | 12.0 | 8.8 |
| 15 | 7.3 | 7.5 | 8.9 | 11.7 | 14.9 | 17.9 | 20.4 | 21.3 | 19.6 | 16.1 | 11.9 | 8.7 |
| 16 | 7.3 | 7.5 | 9.0 | 11.8 | 15.0 | 18.0 | 20.4 | 21.3 | 19.5 | 15.9 | 11.7 | 8.6 |
| 17 | 7.3 | 7.5 | 9.1 | 11.9 | 15.1 | 18.1 | 20.5 | 21.3 | 19.4 | 15.8 | 11.6 | 8.5 |
| 18 | 7.2 | 7.5 | 9.2 | 12.0 | 15.2 | 18.2 | 20.6 | 21.3 | 19.3 | 15.6 | 11.5 | 8.4 |
| 19 | 7.2 | 7.6 | 9.2 | 12.1 | 15.3 | 18.3 | 20.7 | 21.3 | 19.2 | 15.5 | 11.3 | 8.4 |
| 20 | 7.2 | 7.6 | 9.3 | 12.3 | 15.4 | 18.4 | 20.7 | 21.2 | 19.1 | 15.3 | 11.2 | 8.3 |
| 21 | 7.2 | 7.6 | 9.4 | 12.4 | 15.5 | 18.5 | 20.8 | 21.2 | 19.0 | 15.2 | 11.1 | 8.2 |
| 22 | 7.2 | 7.6 | 9.5 | 12.5 | 15.7 | 18.5 | 20.9 | 21.2 | 18.9 | 15.1 | 10.9 | 8.1 |
| 23 | 7.2 | 7.7 | 9.6 | 12.6 | 15.8 | 18.6 | 21.0 | 21.2 | 18.8 | 14.9 | 10.8 | 8.0 |
| 24 | 7.2 | 7.7 | 9.6 | 12.7 | 15.9 | 18.7 | 21.0 | 21.2 | 18.7 | 14.8 | 10.6 | 8.0 |
| 25 | 7.2 | 7.7 | 9.7 | 12.8 | 16.0 | 18.8 | 21.1 | 21.1 | 18.6 | 14.6 | 10.5 | 7.9 |
| 26 | 7.2 | 7.7 | 9.8 | 12.9 | 16.1 | 18.9 | 21.2 | 21.1 | 18.5 | 14.5 | 10.4 | 7.8 |
| 27 | 7.2 | 7.8 | 9.9 | 13.0 | 16.2 | 19.0 | 21.3 | 21.1 | 18.4 | 14.3 | 10.2 | 7.7 |
| 28 | 7.2 | 7.8 | 10.0 | 13.1 | 16.3 | 19.1 | 21.3 | 21.1 | 18.3 | 14.2 | 10.1 | 7.6 |
| 29 | 7.1 | 7.8* | 10.0 | 13.2 | 16.4 | 19.2 | 21.4 | 21.1 | 18.2 | 14.0 | 10.0 | 7.6 |
| 30 | 7.1 | - | 10.1 | 13.3 | 16.5 | 19.3 | 21.5 | 21.6 | 18.1 | 13.9 | 9.8 | 7.5 |
| 31 | 7.1 | - | 10.2 | - | 16.7 | - | 21.6 | 21.0 | - | 13.8 | - | 7.4 |