| Month | NOAA Normals (in) | PRISM Normals (in) | Diff (in) |
|---|---|---|---|
| Jan | 0.44 | 0.42 | 0.02 |
| Feb | 0.45 | 0.47 | -0.02 |
| Mar | 0.75 | 0.71 | 0.04 |
| Apr | 1.30 | 1.23 | 0.07 |
| May | 2.61 | 2.51 | 0.10 |
| Jun | 3.21 | 3.38 | -0.17 |
| Jul | 2.98 | 3.18 | -0.20 |
| Aug | 2.15 | 2.29 | -0.14 |
| Sep | 1.58 | 1.77 | -0.19 |
| Oct | 1.44 | 1.47 | -0.03 |
| Nov | 0.60 | 0.67 | -0.07 |
| Dec | 0.53 | 0.57 | -0.04 |
18.04 | 18.67 | -0.63 |