January 31, 2025
Statewide Dashboard
December in Review: Trends, Tools, and What’s Next
In the third month of the water year, the Core Supply region gained 4.91 inches of precipitation, adding 16.5 percentage points to the total WY accumulation. There’s a lot to unpack—comparing analog water years to the current year, discussing Southern California’s dry start, and looking forward to what lies ahead. Dive into the Insights section (left sidebar menu) for the details.
The dashboard below shows the Statewide status with National Weather Service data through December 31.
Statewide:
CAP Forecast WY 2024-25
Statewide:
Year-over-Year Comparison
Highlights
- The state added 4.91” to its WY accumulation in the month of December, nearly matching November’s accumulation of 5.5”. This brings the WY to 35.85% of normal, leaving 54.15 percentage points to reach the lower end of the CAP forecast range.
- Accumulated precipitation remains close to the curves for analog years 2017-18 and 2018-19. The plot below shows the Statewide precipitation for the current water year (10.69” through the end of December), exceeding the totals for both 2017-18 and 2018-19 (with 5.62” and 7.33”, respectively, through December). However, the latest traces of the 8-, 5- and 6-station indices (highlighted in the Insights section) show that precipitation has nearly flatlined in January and we will likely see that the current water year is between the two analog curves with next month’s report.
