At SeaTac each of the past ten days has had measurable precipitation totaling 3.3 inches.  The past month (31 days) has seen 7.5 inches, which is about 200% of normal.

SEATTLE TACOMA AP      Elevation: 400 ft       1971-2000 Normals
      JAN   FEB   MAR   APR   MAY   JUN   JUL   AUG   SEP   OCT   NOV   DEC
PCP  5.13  4.18  3.75  2.59  1.78  1.49   .79  1.02  1.63  3.19  5.90  5.62