Explore. Experience. Hawaii.
Reference
6 things this site publishes as data rather than as advice. Free to quote, each one sourced and carrying the date it was last checked.
Most Hawaii planning advice is written from memory and never checked again. These pages are the opposite: every figure on them was measured or taken from an official source, the method is written next to the number and each page shows the date somebody last verified it.
That last part is the one that matters. A page with no verification date is not necessarily wrong, but there is no way to tell how old it is, and Hawaii reservation rules and road conditions change faster than travel pages get updated.
6 reservations
Every timed-entry reservation in Hawaii with its exact release window, how hard it actually is to get, and the operator page each number came from.
Method. Each figure read from the operator's own booking page and quoted, not inferred.
Rechecked at least every 90 days, because operators move these without notice.
Last verified August 16, 2026
12 areas, 5 stations
Monthly rainfall, air temperature and sea temperature from NOAA, plus annual rainfall for the places people actually book. Hilo takes twelve times the rain Kona does, on the same island.
Method. NOAA NCEI 1991 to 2020 monthly normals, plus a four-year hourly mean from NOAA CO-OPS station 1612340 for sea temperature.
Refetched from NOAA with one command. Normals are recomputed once a decade.
Last verified August 17, 2026
173 routes
Every pair of named points on each island, measured on two independent routing engines with the slower figure published. Free-flow: a floor where the map carries a speed limit, conservative where it does not.
Method. OSRM and Valhalla over OpenStreetMap, slower figure published. Free-flow: a floor where the map carries a speed limit, conservative where it does not. Every coordinate gated against the nearest-road API first.
Remeasured on demand, and the build fails if it goes six months unchecked.
Last verified August 18, 2026
88,387 flights
Every flight to Hawaii and between the islands over six months. Real air time against the timetable, flights a day, on-time and cancellation rates, and the 38 minutes the jet stream costs you flying out rather than home.
Method. US DOT Reporting Carrier On-Time Performance, one row per flight operated. A census, not a sample. Medians published. Carriers below the federal reporting threshold are absent, which means Molokaʻi and Lānaʻi are not covered.
Remeasured on demand, and the build fails if it goes six months unchecked.
Last verified August 19, 2026
68 city pairs
Every nonstop to Hawaii placed at its true bearing and distance from Honolulu, coloured by what the jet stream costs you flying out. The two routes that are faster on the way out are the two that approach from the west.
Method. Azimuthal equidistant projection centred on Honolulu, so distance from the middle is true distance and angle is true bearing. Coordinates from OurAirports, public domain.
Redrawn whenever the flight data is remeasured.
Last verified August 19, 2026
Live
The current USGS alert level for Kīlauea and Mauna Loa, read when the page loads rather than when it was written, with the only public record of past level changes.
Method. USGS Volcano Science Center elevated-status feed, read server-side per request. Absence from the feed means NORMAL, not unknown.
Read on every request. Level changes recorded daily.
Quote it, screenshot it, put it in a spreadsheet or link it. Everything here except the live volcano feed is also downloadable as a CSV. A credit to hawaiitravelers.com is appreciated and never required, and the climate and drive-time pages carry a pre-written citation if you would like one.
The underlying measurements belong to NOAA, the National Park Service, USGS and OpenStreetMap, and every page says which. What is ours is the assembly, which in each case did not exist anywhere else in one place.
If a figure here stops matching its source, tell us and it gets recomputed and re-dated rather than quietly edited.