South West Coast
December 2022 Summary
Rainfall was lower than average (including lowest on record) across 63 per cent of the area, spread throughout the drainage division. Total rainfall was 5 mm, 67 per cent lower than the long-term mean of 15 mm for December.
Streamflows were variable across the drainage division. Hill River - Hill River Springs had the highest streamflow for December since 1980.
Median streamflow salinity (electrical conductivity) varied between sites from 1326 to 38 241 μS/cm. Streamflows were brackish for 14 per cent of the sites and saline for 72 per cent of sites. Mortlock River - Odriscolls Farm had the highest salinity of all sites.
During December, storage volumes in all systems decreased. By the end of the month, the volume of water stored was 60 per cent of the total accessible capacity, which is three percentage points lower than the previous year.
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Rainfall
Streamflow
Streamflow salinity
Water storages
Rainfall
Rainfall statistics
| Rainfall decile group | Percentage of area |
|---|---|
| Highest on record since 1900 | 0% |
| Very much above average | 1% |
| Above average | 3% |
| Average | 33% |
| Below average | 42% |
| Very much below average | 20% |
| Lowest on record since 1900 | 1% |
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