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San Francisco (Golden Gate) water levels in 2021
Annual rank18 / 170
vs. average12.3 cm
Highest monthly peak1.32 mDecember 2021
Monthly mean vs. previous year
| Month | 2021 (cm) | 2020 (cm) | Diff | Peak (m) |
|---|---|---|---|---|
| Jan | 2.1 | 1.7 | 0.4 | 1.20 |
| Feb | -6.3 | 1.3 | -7.6 | 1.10 |
| Mar | -7.3 | 4.9 | -12.2 | 0.95 |
| Apr | -4.2 | -2.6 | -1.6 | 1.09 |
| May | -2.6 | 0.1 | -2.7 | 1.18 |
| Jun | 3.6 | 2.1 | 1.5 | 1.29 |
| Jul | 8.2 | 7.8 | 0.4 | 1.23 |
| Aug | 11.8 | 9.0 | 2.8 | 1.24 |
| Sep | 8.9 | 8.9 | 0.0 | 1.00 |
| Oct | 7.7 | 8.1 | -0.4 | 1.13 |
| Nov | 1.6 | -0.4 | 2.0 | 1.17 |
| Dec | 9.9 | -1.7 | 11.6 | 1.32 |
Nearby years (cm vs. average)
+14.4
+17.6
+14.3
+19.2
+12.8
+12.3
+11.3
+21.1
+15.7
Monthly means are relative to the station's mean sea level (MSL) datum.
About this page
The 2021 annual mean water level ranked 18 of 170 years (12.3 cm vs. the period average).