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San Juan water levels in 2021
Annual rank11 / 57
vs. average4.4 cm
Highest monthly peak0.59 mOctober 2021
Monthly mean vs. previous year
| Month | 2021 (cm) | 2020 (cm) | Diff | Peak (m) |
|---|---|---|---|---|
| Jan | 3.0 | 4.5 | -1.5 | 0.39 |
| Feb | 0.3 | 1.2 | -0.9 | 0.36 |
| Mar | -3.1 | -2.9 | -0.2 | 0.32 |
| Apr | 1.6 | -1.3 | 2.9 | 0.42 |
| May | -1.6 | 4.0 | -5.6 | 0.36 |
| Jun | 2.8 | 7.4 | -4.6 | 0.49 |
| Aug | 9.0 | 8.8 | 0.2 | 0.40 |
| Sep | 9.8 | 10.8 | -1.0 | 0.39 |
| Oct | 17.7 | 13.0 | 4.7 | 0.59 |
| Nov | 15.5 | 12.6 | 2.9 | 0.54 |
| Dec | 8.4 | 7.8 | 0.6 | 0.55 |
Nearby years (cm vs. average)
+7.0
+3.0
+4.3
+6.5
+5.0
+4.4
+7.2
+8.2
+4.7
+7.6
Monthly means are relative to the station's mean sea level (MSL) datum.
About this page
The 2021 annual mean water level ranked 11 of 57 years (4.4 cm vs. the period average).