"we are 27 inches above normal for rain"

It probably feels like that to you Mike!

From your NWS in Philidelphia:

https://w2.weather.gov/climate/index.php?wfo=phi

WEATHER ITEM   OBSERVED TIME   RECORD YEAR NORMAL DEPARTURE LAST                VALUE   (LST)  VALUE       VALUE  FROM      YEAR                                                  NORMAL .................................................................. TEMPERATURE (F) YESTERDAY  MAXIMUM         75    449 PM  96    1941  76     -1       66  MINIMUM         54    452 AM  43    1895  56     -2       59  AVERAGE         65                        66     -1       63 
PRECIPITATION (IN)  YESTERDAY        0.00          1.67 1947   0.13  -0.13     0.35  MONTH TO DATE    3.87                      2.59   1.28     4.26  SINCE MAR 1     10.74                      9.94   0.80    12.94  SINCE JAN 1     17.93                     15.62   2.31    21.81

The text above doesn't copy well but it shows you are 2.31 inches above normal for the year and 1.28 inches above normal for May. 

This month you've had 3.87 vs 2.59 average. Last year you saw 4.26 at this time so it was even a bit wetter in  May 2018!