Categories compare accumulated precipitation ending on each station's latest available report with the historical distribution for the same calendar ending date and accumulation period.
Exceptionally dry: At or below P2.
Extremely dry: P2–P5.
Severely dry: P5–P10.
Moderately dry: P10–P20.
Slightly dry: P20–P30. Normal: P30–P70.
Slightly wet: P70–P80.
Moderately wet: P80–P90.
Very wet: P90–P95.
Extremely wet: P95–P98.
Exceptionally wet: At or above P98. Not ranked / unavailable: Fewer than 30 valid historical years are available for that calendar date/window, or recent precipitation data are unavailable.
Source: NOAA Regional Climate Centers / Applied Climate Information System (ACIS). Disclaimer: Data are preliminary and may contain errors. For official climate records, please refer to NOAA/NCEI.