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Apra Harbor, Guam water levels in 1999
Annual rank9 / 73
vs. average10.9 cm
Highest monthly peak0.59 mApril 1999
Monthly mean vs. previous year
| Month | 1999 (cm) | 1998 (cm) | Diff | Peak (m) |
|---|---|---|---|---|
| Feb | 14.6 | – | – | 0.50 |
| Mar | 16.0 | – | – | 0.51 |
| Apr | 19.4 | – | – | 0.59 |
| May | 17.4 | – | – | 0.58 |
| Jun | 16.7 | – | – | – |
| Jul | 16.0 | – | – | – |
| Aug | 15.4 | – | – | 0.54 |
| Sep | 12.5 | – | – | 0.50 |
| Oct | 11.3 | – | – | 0.46 |
| Nov | 8.6 | – | – | 0.48 |
| Dec | 8.4 | – | – | 0.49 |
Nearby years (cm vs. average)
-0.1
-3.5
+5.4
-11.8
+10.9
+9.9
+7.2
+1.1
+1.6
Monthly means are relative to the station's mean sea level (MSL) datum.
About this page
The 1999 annual mean water level ranked 9 of 73 years (10.9 cm vs. the period average).