Historical estimate
A day with rain in Hilo, Hawaiʻi
- Probability:
- 74.8%
- Odds:
- 3 to 1
- dBan
- +4.7 dBan
The 1991–2020 NOAA normal records at least 0.01 inch of precipitation on 273 days in a representative 365-day year at Hilo.
Calculation
p ≈ 273 precipitation days / 365 days = 0.74795
Assumptions
The station is Hilo International Airport, Hawaiʻi. A precipitation day records at least 0.01 inch, or 0.254 mm. A brief shower qualifies, so this does not mean rain lasts all day and it is not a forecast.
Sources
- NOAA 1991–2020 Monthly Normals: Hilo International Airport page 2 annual summary: 273.0 precipitation days