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Apra Harbor, Guam water levels in 1991
Annual rank69 / 73
vs. average-12.1 cm
Highest monthly peak0.50 mAugust 1991
Monthly mean vs. previous year
| Month | 1991 (cm) | 1990 (cm) | Diff | Peak (m) |
|---|---|---|---|---|
| Jan | -15.8 | -22.2 | 6.4 | 0.21 |
| Feb | -13.1 | -12.2 | -0.9 | 0.30 |
| Mar | -8.2 | -5.8 | -2.4 | 0.27 |
| Apr | -12.5 | -8.2 | -4.3 | 0.25 |
| May | -19.2 | -6.1 | -13.1 | 0.21 |
| Jun | -5.5 | -3.7 | -1.8 | 0.36 |
| Jul | 3.7 | -5.8 | 9.5 | 0.48 |
| Aug | 4.3 | -3.0 | 7.3 | 0.50 |
| Sep | -4.3 | -5.8 | 1.5 | 0.36 |
| Oct | -6.4 | -11.9 | 5.5 | 0.34 |
| Nov | -8.2 | -7.3 | -0.9 | 0.37 |
| Dec | -20.7 | -15.5 | -5.2 | 0.23 |
Nearby years (cm vs. average)
-7.6
-11.7
+0.1
-2.0
-12.2
-12.1
-12.0
-4.0
-0.1
-3.5
+5.4
Monthly means are relative to the station's mean sea level (MSL) datum.
About this page
The 1991 annual mean water level ranked 69 of 73 years (-12.1 cm vs. the period average).