| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 12.4 | 8.6 | 12.9 | 17.0 | 26.3 | 19.6 | 29.3 | 25.1 | 22.7 | 23.8 | 15.8 | |
| 2 | 6.5 | 9.4 | 11.8 | 21.1 | 24.2 | 21.8 | 25.9 | 25.8 | 20.7 | 19.8 | 14.2 | |
| 3 | 6.8 | 12.4 | 15.0 | 18.7 | 24.4 | 19.8 | 25.9 | 25.3 | 22.1 | 17.4 | 16.2 | |
| 4 | 6.3 | 11.2 | 14.3 | 23.6 | 18.6 | 19.7 | 24.7 | 21.3 | 21.8 | 16.9 | 17.6 | |
| 5 | 12.9 | 10.7 | 12.6 | 23.9 | 15.6 | 17.4 | 21.7 | 24.4 | 23.1 | 18.0 | ||
| 6 | 12.1 | 10.6 | 13.5 | 21.1 | 19.4 | 20.4 | 25.0 | 26.3 | 26.2 | 20.8 | ||
| 7 | 7.4 | 5.7 | 12.4 | 18.1 | 21.0 | 17.8 | 25.3 | 22.1 | 22.3 | 20.2 | ||
| 8 | 4.1 | 5.2 | 14.6 | 17.0 | 21.2 | 19.5 | 24.7 | 24.7 | 22.2 | 19.9 | ||
| 9 | 6.7 | 9.3 | 17.3 | 18.1 | 22.9 | 20.1 | 25.9 | 25.0 | 20.6 | 19.4 | ||
| 10 | 4.7 | 5.2 | 17.0 | 15.8 | 25.4 | 21.8 | 29.8 | 27.8 | 17.8 | 14.7 | ||
| 11 | 7.6 | 5.4 | 12.6 | 20.3 | 22.5 | 25.3 | 30.3 | 31.7 | 19.7 | 17.6 | ||
| 12 | 8.7 | 6.8 | 12.2 | 16.9 | 22.9 | 24.0 | 29.5 | 30.8 | 20.4 | 20.0 | ||
| 13 | 8.2 | 5.8 | 10.9 | 16.9 | 24.9 | 27.1 | 29.8 | 21.5 | 20.6 | 17.8 | ||
| 14 | 12.2 | 7.7 | 12.4 | 16.7 | 25.2 | 21.2 | 23.7 | 26.8 | 18.1 | 18.3 | ||
| 15 | 9.7 | 8.9 | 11.9 | 17.5 | 24.5 | 22.9 | 22.7 | 30.7 | 19.8 | 16.5 | ||
| 16 | 11.2 | 6.0 | 12.9 | 16.5 | 25.0 | 23.7 | 25.7 | 28.5 | 20.5 | 22.3 | ||
| 17 | 7.7 | 7.4 | 10.4 | 19.1 | 21.3 | 23.7 | 25.3 | 28.9 | 17.9 | 17.7 | ||
| 18 | 6.5 | 9.9 | 13.2 | 10.9 | 21.8 | 25.9 | 27.6 | 22.9 | 20.1 | 15.7 | ||
| 19 | 6.0 | 10.4 | 15.4 | 17.7 | 23.5 | 31.1 | 24.6 | 26.6 | 22.4 | 16.2 | ||
| 20 | 9.3 | 12.2 | 18.6 | 15.4 | 26.2 | 29.3 | 21.7 | 23.4 | 19.0 | 16.7 | ||
| 21 | 7.6 | 11.9 | 15.1 | 17.9 | 19.8 | 31.6 | 23.2 | 27.5 | 18.0 | 16.1 | ||
| 22 | 6.1 | 14.8 | 16.4 | 17.6 | 24.7 | 22.4 | 24.3 | 25.3 | 20.2 | 17.7 | ||
| 23 | 10.6 | 11.0 | 14.8 | 15.8 | 21.2 | 23.8 | 25.0 | 27.7 | 21.9 | 13.3 | ||
| 24 | 11.4 | 14.1 | 12.5 | 18.9 | 18.3 | 21.5 | 25.8 | 28.8 | 22.2 | 14.9 | ||
| 25 | 9.1 | 13.4 | 17.1 | 18.6 | 20.8 | 24.4 | 26.3 | 29.9 | 24.0 | 14.8 | ||
| 26 | 10.6 | 11.7 | 17.6 | 19.8 | 19.4 | 23.4 | 24.8 | 23.9 | 17.0 | 12.8 | ||
| 27 | 10.3 | 12.2 | 13.7 | 21.6 | 15.2 | 23.9 | 22.3 | 23.2 | 19.2 | 15.9 | ||
| 28 | 10.4 | 13.9 | 15.4 | 23.4 | 22.0 | 24.8 | 25.1 | 22.2 | 22.9 | 17.3 | ||
| 29 | 8.3 | 14.0 | 25.5 | 18.5 | 27.0 | 24.5 | 22.0 | 23.4 | 14.3 | |||
| 30 | 10.1 | 18.1 | 25.7 | 20.7 | 30.1 | 26.3 | 19.9 | 22.9 | 15.0 | |||
| 31 | 11.6 | 18.3 | 21.6 | 25.6 | 21.9 | 16.3 | ||||||
| Avg: | 8.8 | 9.7 | 14.4 | 18.9 | 21.9 | 23.5 | 25.6 | 25.5 | 21.0 | 17.4 | * 16.0 | |
| Hi: | 12.9 | 14.8 | 18.6 | 25.7 | 26.3 | 31.6 | 30.3 | 31.7 | 26.2 | 23.8 | * 17.6 | |
| Lo: | 4.1 | 5.2 | 10.4 | 10.9 | 15.2 | 17.4 | 21.7 | 19.9 | 17.0 | 12.8 | * 14.2 | |
| Note: | *Incomplete dataset. | |||||||||||
| Avg | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2025 | 8.8 | 9.7 | 14.4 | 18.9 | 21.9 | 23.5 | 25.6 | 25.5 | 21.0 | 17.4 | * 16.0 | |
| 2024 | 8.6 | 11.7 | 12.6 | 15.1 | 19.7 | 22.2 | 23.0 | 23.5 | 20.0 | 17.7 | 12.8 | 10.8 |
| 2023 | 9.1 | 10.5 | 11.3 | 14.3 | 19.0 | 23.9 | 21.1 | 21.6 | 22.7 | 17.6 | 11.7 | 11.3 |
| 2022 | 9.8 | 11.6 | 13.1 | 15.4 | 18.5 | 21.7 | 24.8 | 25.6 | 20.4 | 18.6 | 13.7 | 8.4 |
| 2021 | * 7.1 | 9.7 | 12.2 | 13.7 | 15.8 | 20.9 | 23.1 | 21.2 | 21.7 | 17.3 | 12.0 | * 10.9 |
| 2020 | 9.3 | 10.7 | 11.7 | 18.2 | 20.8 | 21.2 | 22.1 | 22.9 | 20.6 | 14.4 | 12.7 | 8.8 |
| 2019 | 7.0 | 11.2 | 11.6 | 14.4 | 16.8 | 18.9 | 23.2 | 21.6 | 19.0 | 14.1 | 9.8 | 9.5 |
| 2018 | 8.9 | 6.6 | 8.5 | 13.5 | 18.7 | 22.1 | 25.3 | 21.3 | 18.7 | 14.8 | 11.4 | 10.1 |
| 2017 | 7.6 | 9.0 | 12.2 | 14.2 | 17.9 | 20.6 | 21.1 | 20.1 | 17.3 | 15.5 | 10.5 | 8.3 |
| 2016 | 8.9 | 8.5 | 9.6 | 12.2 | 17.5 | 18.9 | 21.2 | 21.5 | 19.6 | 14.3 | 9.4 | 9.1 |
| 2015 | 8.8 | 7.2 | 10.4 | 15.0 | 15.3 | 19.4 | 20.3 | 19.6 | 17.4 | 14.5 | 12.5 | 12.8 |
| 2014 | 9.4 | 9.5 | 11.7 | 14.3 | 16.6 | 20.9 | 23.2 | 19.4 | 20.5 | 15.9 | 11.8 | 8.9 |
| 2013 | * 18.7 | 16.7 | 11.1 | * 9.7 | ||||||||
| Avg | * 8.6 | 9.7 | 11.6 | 14.9 | 18.2 | 21.2 | 22.8 | 22.0 | * 19.8 | 16.1 | * 11.9 | * 9.9 |