Tide TablesHome › Tide tables & water levels › Johnston Atoll
Johnston Atoll water levels in 1991
Annual rank38 / 48
vs. average-3.4 cm
Highest monthly peak0.61 mSeptember 1991
Monthly mean vs. previous year
| Month | 1991 (cm) | 1990 (cm) | Diff | Peak (m) |
|---|---|---|---|---|
| Jan | -7.1 | 8.1 | -15.2 | 0.54 |
| Feb | -10.2 | -11.4 | 1.2 | 0.54 |
| Mar | -10.8 | -15.4 | 4.6 | 0.41 |
| Apr | -17.8 | -6.8 | -11.0 | 0.33 |
| May | -23.3 | -7.1 | -16.2 | 0.28 |
| Jun | -4.1 | -5.0 | 0.9 | 0.45 |
| Jul | 1.1 | -3.5 | 4.6 | 0.49 |
| Aug | 2.3 | 10.2 | -7.9 | 0.57 |
| Sep | 10.2 | -1.7 | 11.9 | 0.61 |
| Oct | 5.4 | -2.6 | 8.0 | 0.54 |
| Nov | 5.1 | -1.3 | 6.4 | 0.61 |
| Dec | -5.9 | -1.7 | -4.2 | 0.52 |
Nearby years (cm vs. average)
-3.9
-0.4
+6.6
-2.4
-2.0
-3.4
+4.5
+0.6
+1.5
+1.5
+5.8
Monthly means are relative to the station's mean sea level (MSL) datum.
About this page
The 1991 annual mean water level ranked 38 of 48 years (-3.4 cm vs. the period average).