| Measured | Climate | Anomaly | |
| 2018 Annual | 954 | 879.7 | 74.3 |
| Jan | 97 | 104.0 | -7.0 |
| Feb | 40.4 | 77.2 | -36.8 |
| Mar | 170.2 | 73.0 | 97.2 |
| Apr | 73.2 | 56.0 | 17.2 |
| May | 28.6 | 62.0 | -33.4 |
| Jun | 7.2 | 55.0 | -47.8 |
| Jul | 44.6 | 52.0 | -7.4 |
| Aug | 66.6 | 63.5 | 3.1 |
| Sep | 46.6 | 67.5 | -20.9 |
| Oct | 72.4 | 84.5 | -12.1 |
| Nov | 175.8 | 85.0 | 90.8 |
| Dec | 131.4 | 100.0 | 31.4 |