Daily precipitation maps
A daily-updated snapshot of statewide rainfall conditions. Use these maps to compare current totals against long-term normals and to see where conditions are wetter or drier than expected.
Note: PRISM publishing schedules mean these maps typically reflect conditions from 1 to 2 days ago.
What each map represents
The three maps are meant to be read together. Start with actual totals, compare them to the long-term normal, and then use percent of normal to see where conditions are unusually wet or dry.
Year-to-date actual rainfall
DailyTotal precipitation accumulated so far this year.
Shows how much water has actually fallen and where totals are concentrated statewide.
- Highlights areas with significant accumulation since January 1.
- Use for short-term context when evaluating storage or recharge potential.
- Best read alongside the normal map to judge how unusual totals are.
Year-to-date normal rainfall
Daily30-year normals accumulated to the same day of year.
Provides the baseline expectation for this point in the year, smoothing out day-to-day swings.
- Represents the long-term average for the same day of year.
- Use as a benchmark for what typical water availability looks like.
- Pairs with percent of normal to show departures from average.
Percent of normal
DailyActual rainfall expressed as a percent of the normal.
Makes wet and dry anomalies obvious by translating totals into a comparable percent scale.
- Values above 100 percent indicate wetter-than-normal conditions.
- Values below 100 percent show deficits and potential stress.