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Philadelphia, US Coast Guard Station, Pa. water levels in 2021
Annual rank7 / 36
vs. average7.3 cm
Highest monthly peak2.10 mOctober 2021
Monthly mean vs. previous year
| Month | 2021 (cm) | 2020 (cm) | Diff | Peak (m) |
|---|---|---|---|---|
| Jan | 5.8 | 2.0 | 3.8 | 1.37 |
| Feb | 5.2 | 2.4 | 2.8 | 1.34 |
| Mar | 3.4 | 12.7 | -9.3 | 1.34 |
| Apr | 9.9 | 18.7 | -8.8 | 1.36 |
| May | 6.6 | 13.1 | -6.5 | 1.50 |
| Jun | 13.8 | 18.5 | -4.7 | 1.43 |
| Jul | 19.1 | 21.8 | -2.7 | 1.45 |
| Aug | 22.1 | 25.0 | -2.9 | 1.55 |
| Sep | 30.4 | 22.6 | 7.8 | 1.89 |
| Oct | 32.2 | 16.7 | 15.5 | 2.10 |
| Nov | 11.5 | 4.3 | 7.2 | 1.48 |
| Dec | 1.2 | 10.1 | -8.9 | 1.39 |
Nearby years (cm vs. average)
-0.1
+2.4
+9.3
+10.6
+7.8
+7.3
+4.4
+13.5
+14.9
+4.2
Monthly means are relative to the station's mean sea level (MSL) datum.
About this page
The 2021 annual mean water level ranked 7 of 36 years (7.3 cm vs. the period average).