USDA Hardiness Zone 12b
Frost Dates for 96772 — Naalehu, Hawaii
NOAA 1991–2020 normals from Sea Mountain 12.15, HI (80 ft), 5 miles east.
Updated
No night at or below 32°F was recorded at Sea Mountain 12.15, HI in 1991–2020, not even 36°F, so Naalehu has no frost dates to plan around; the coolest month, February, averages a low of 65°F.
- Winters with a freeze
- 0%
- Winters with 36°F
- 0%
- Coldest month low
- 65°F
- Hardiness zone
- 12b
32°F or below, 1991–2020
frost possible on leaves
average, February
55 to 60°F (12.8 to 15.6°C) coldest night
- First snow
- Rare
- Last snow
- Rare
- Winters with snow
- 0%
- Snow per year
- 0"
median, 1991–2020
median, 1991–2020
0 of 20 observed
NOAA normal
Frost risk by date in Naalehu
Sea Mountain 12.15, HI, 5 miles east of Naalehu, did not record a night at or below 32°F in 1991–2020. 36 of the 37 other Hawaii stations behind this site's ZIP pages recorded no 32°F night either.
Freeze probabilities 1991–2020 at Sea Mountain 12.15, HI, from NOAA NCEI U.S. Climate Normals. Where a temperature is reached in fewer than 99.5% of years, the dates describe only the years that reach it. Not a forecast.
Frost risk on any date in 96772 →Compare Naalehu with another place →
Weather by month in Naalehu
August is the warmest month at Sea Mountain 12.15, HI, averaging 85°F by day and 71°F at night; January is the coldest at 79°F and 65°F. Not one month recorded a 32°F night; the lowest monthly average low is 65°F.
Warmth for growing adds up to 9,127 growing degree days a year (base 50°F), more than at 54% of the 35 Hawaii stations. 47% of them (4,287) have built up by the end of June, and August adds the most, 854. Precipitation totals 35.2 inches a year, most in October (4.1") and least in June (0.8"); May to September bring 28% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 79 | 65 | 3.5 | 0% | 0 | 688 |
| Feb | 80 | 65 | 3.9 | 0% | 0 | 627 |
| Mar | 80 | 66 | 4.0 | 0% | 0 | 704 |
| Apr | 80 | 67 | 1.9 | 0% | 0 | 713 |
| May | 82 | 68 | 1.4 | 0% | 0 | 772 |
| Jun | 83 | 70 | 0.8 | 0% | 0 | 783 |
| Jul | 84 | 70 | 1.9 | 0% | 0 | 836 |
| Aug | 85 | 71 | 2.9 | 0% | 0 | 854 |
| Sep | 84 | 70 | 2.8 | 0% | 0 | 815 |
| Oct | 84 | 70 | 4.1 | 0% | 0 | 837 |
| Nov | 82 | 69 | 4.0 | 0% | 0 | 762 |
| Dec | 81 | 67 | 4.0 | 0% | 0 | 738 |
Monthly normals 1991–2020 at Sea Mountain 12.15, HI (80 ft), NOAA NCEI. "32°F night": chance of at least one in the month. GDD: growing degree days, base 50°F.
Compared with the next station
The nearest other station, S Kona 2 2.32, HI, 11 miles west of Naalehu and 2,041 feet higher, has no 32°F night on record either, and a coolest-month low 11°F colder (54°F).
When it snows in Naalehu, Hawaii
Measurable snow is rare here: only 0 of 20 winters from 1991 to 2020 recorded 0.1 inch or more at Sea Mountain 12.15, HI, 5.2 miles away, so there is no typical first-snow date to plan around.
Where these figures come from
ZIP 96772 is 5 miles from Sea Mountain 12.15, HI, which stands at 80 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 96772 in zone 12b, the band where the coldest night of the year averaged 55 to 60°F (12.8 to 15.6°C) over 1991–2020; a zone describes winter lows, not frost dates.
Hardiness zone and temperature range: USDA Plant Hardiness Zone Map 2023 (USDA-ARS, Oregon State University), ZIP-code listing, unchanged. °C converted from °F by this site.
Thirty-year averages, not a forecast: check the forecast before planting out. How stations are matched and which pages are offered to search engines: methodology.