| Station: | Porter, Washington | Continent: | North America | ||
| River: | Chehalis | Major Basin : | Pacific Ocean | ||
| Country: | United States | Discharge into : | Pacific Ocean | ||
| Observation Period: | 1965 - 1972 | Total Months: | 93 | ||
| Latitude (dec deg): | 46.93 N | Area (km2): | 3351 | ||
| Longitude (dec deg): | 123.31 W | Elevation (m): | 7 | ||
| Annual Discharge: (m3/s): | 120.4 | (km3/yr): | 3.8 | ||
| Annual Runoff: (l/s/km2): | 36.0 | (mm/yr): | 1136.3 |
| Mean for Observation Period | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
| m3/sec | 359.8 | 243.7 | 208.9 | 116.9 | 49.5 | 29.8 | 15.4 | 10.7 | 15.8 | 40.8 | 96.8 | 265.7 |
| km3/mo | 1.0 | 0.6 | 0.6 | 0.3 | 0.1 | 0.1 | 0.0 | 0.0 | 0.0 | 0.1 | 0.3 | 0.7 |
| mm/mo | 287.5 | 175.9 | 167.0 | 90.4 | 39.6 | 23.1 | 12.3 | 8.5 | 12.2 | 32.6 | 74.9 | 212.4 |
| l/s/km2 | 107.4 | 72.7 | 62.3 | 34.9 | 14.8 | 8.9 | 4.6 | 3.2 | 4.7 | 12.2 | 28.9 | 79.3 |
