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Philadelphia, US Coast Guard Station, Pa. water levels in 1991
Annual rank33 / 36
vs. average-9.8 cm
Highest monthly peak1.60 mNovember 1991
Monthly mean vs. previous year
| Month | 1991 (cm) | 1990 (cm) | Diff | Peak (m) |
|---|---|---|---|---|
| Jan | -3.0 | – | – | 1.33 |
| Feb | -14.5 | -10.3 | -4.2 | 1.36 |
| Mar | 2.2 | -16.4 | 18.6 | 1.20 |
| Apr | -3.6 | -8.1 | 4.5 | 1.33 |
| May | 0.6 | 6.4 | -5.8 | 1.28 |
| Jun | 0.3 | -2.3 | 2.6 | 1.21 |
| Jul | 1.7 | -1.4 | 3.1 | 1.31 |
| Aug | -1.7 | 4.4 | -6.1 | 1.39 |
| Sep | -3.4 | 2.6 | -6.0 | 1.19 |
| Oct | -0.3 | -2.0 | 1.7 | 1.42 |
| Nov | -5.8 | -12.2 | 6.4 | 1.60 |
| Dec | -15.4 | -8.5 | -6.9 | 1.22 |
Nearby years (cm vs. average)
-10.5
-9.8
-8.3
-4.6
-5.7
-9.8
+2.9
Monthly means are relative to the station's mean sea level (MSL) datum.
About this page
The 1991 annual mean water level ranked 33 of 36 years (-9.8 cm vs. the period average).