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Portland water levels in 1991
Annual rank31 / 114
vs. average4.0 cm
Highest monthly peak2.38 mOctober 1991
Monthly mean vs. previous year
| Month | 1991 (cm) | 1990 (cm) | Diff | Peak (m) |
|---|---|---|---|---|
| Jan | -4.4 | -9.9 | 5.5 | 2.02 |
| Feb | -5.0 | -11.1 | 6.1 | 1.95 |
| Mar | 6.9 | -13.8 | 20.7 | 2.03 |
| Apr | -0.4 | -8.0 | 7.6 | 1.95 |
| May | 2.3 | 2.0 | 0.3 | 2.04 |
| Jun | 5.1 | 1.4 | 3.7 | 2.12 |
| Jul | 2.9 | -0.4 | 3.3 | 2.09 |
| Aug | 2.0 | 2.0 | 0.0 | 2.06 |
| Sep | -1.3 | 1.7 | -3.0 | 1.88 |
| Oct | 3.5 | 1.1 | 2.4 | 2.38 |
| Nov | 1.4 | 2.3 | -0.9 | 2.14 |
| Dec | 0.5 | -5.9 | 6.4 | 2.22 |
Nearby years (cm vs. average)
+1.1
+3.6
+0.7
-1.5
-0.3
+4.0
+2.7
+2.8
-0.6
+3.9
+7.1
Monthly means are relative to the station's mean sea level (MSL) datum.
About this page
The 1991 annual mean water level ranked 31 of 114 years (4.0 cm vs. the period average).