Frost Dates for 96708 — Haiku, Hawaii

At Haleakala Rs 338, HI, 10 miles south of Haiku, 6% of the winters of 1991–2020 had at least one night at or below 32°F, and none reached 28°F. Nights of 36°F, enough for frost on exposed leaves, are more common (82% of winters) and, when they come, fall between about February 1 and March 6. February is the month most likely to bring one: a 6% chance in a given year. All 37 other Hawaii stations behind this site's ZIP pages freeze in fewer than half of winters too.

August is the warmest month at Haleakala Rs 338, HI, averaging 66°F by day and 49°F at night; February is the coldest at 60°F and 43°F. Every month stays under a 10% chance of a 32°F night; February is the likeliest at 6%.

Warmth for growing adds up to 1,753 growing degree days a year (base 50°F), the fewest of the 35 Hawaii stations. 37% of them (654) have built up by the end of June, and August adds the most, 240. Precipitation totals 42.3 inches a year, most in March (5.7") and least in June (1.6"); May to September bring 27% of it.

The nearest other station, Kahului Airport, HI, 10 miles west of Haiku and 6,911 feet lower, has a 32°F night in 0% of winters against 6% here, and a coolest-month low 21°F warmer (64°F).

Measurable snow is rare here: only 0 of 17 winters from 1991 to 2020 recorded 0.1 inch or more at Kuiaha 490.7, HI, 1.8 miles away, so there is no typical first-snow date to plan around.

ZIP 96708 is 10 miles from Haleakala Rs 338, HI, which stands at 6,962 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 96708 in zone 12a, the band where the coldest night of the year averaged 50 to 55°F (10.0 to 12.8°C) over 1991–2020; a zone describes winter lows, not frost dates.