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Portland water levels in 1990
Annual rank63 / 114
vs. average-0.3 cm
Highest monthly peak2.54 mDecember 1990
Monthly mean vs. previous year
| Month | 1990 (cm) | 1989 (cm) | Diff | Peak (m) |
|---|---|---|---|---|
| Jan | -9.9 | -7.7 | -2.2 | 2.08 |
| Feb | -11.1 | -11.4 | 0.3 | 1.79 |
| Mar | -13.8 | -12.9 | -0.9 | 1.71 |
| Apr | -8.0 | -6.5 | -1.5 | 1.98 |
| May | 2.0 | -0.1 | 2.1 | 2.13 |
| Jun | 1.4 | 2.3 | -0.9 | 2.17 |
| Jul | -0.4 | -1.0 | 0.6 | 1.95 |
| Aug | 2.0 | 0.8 | 1.2 | 1.81 |
| Sep | 1.7 | -2.0 | 3.7 | – |
| Oct | 1.1 | -1.6 | 2.7 | – |
| Nov | 2.3 | -1.3 | 3.6 | 2.22 |
| Dec | -5.9 | -10.8 | 4.9 | 2.54 |
Nearby years (cm vs. average)
+1.1
+1.1
+3.6
+0.7
-1.5
-0.3
+4.0
+2.7
+2.8
-0.6
+3.9
Monthly means are relative to the station's mean sea level (MSL) datum.
About this page
The 1990 annual mean water level ranked 63 of 114 years (-0.3 cm vs. the period average).