USDA Hardiness Zone 12b
Frost Dates for 96817 — Honolulu, Hawaii
NOAA 1991–2020 normals from Manoa Lyon Arbo 785.2, HI (500 ft), 4 miles east.
Updated
No night at or below 32°F was recorded at Manoa Lyon Arbo 785.2, HI in 1991–2020, not even 36°F, so Honolulu has no frost dates to plan around; the coolest month, January, averages a low of 63°F.
- Winters with a freeze
- 0%
- Winters with 36°F
- 0%
- Coldest month low
- 63°F
- Hardiness zone
- 12b
32°F or below, 1991–2020
frost possible on leaves
average, January
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 Honolulu
Manoa Lyon Arbo 785.2, HI, 4 miles east of Honolulu, 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 Manoa Lyon Arbo 785.2, 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 96817 →Compare Honolulu with another place →
Weather by month in Honolulu
September is the warmest month at Manoa Lyon Arbo 785.2, HI, averaging 81°F by day and 70°F at night; January is the coldest at 76°F and 63°F. Not one month recorded a 32°F night; the lowest monthly average low is 63°F.
Warmth for growing adds up to 8,170 growing degree days a year (base 50°F), fewer than at 74% of the 35 Hawaii stations. 46% of them (3,777) have built up by the end of June, and August adds the most, 780. Precipitation totals 151.0 inches a year, most in July (15.4") and least in February (9.1"); May to September bring 41% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 76 | 63 | 10.6 | 0% | 0 | 606 |
| Feb | 76 | 63 | 9.1 | 0% | 0 | 549 |
| Mar | 76 | 64 | 13.7 | 0% | 0 | 614 |
| Apr | 76 | 65 | 12.9 | 0% | 0 | 621 |
| May | 78 | 67 | 9.3 | 0% | 0 | 690 |
| Jun | 78 | 68 | 12.9 | 0% | 0 | 698 |
| Jul | 79 | 70 | 15.4 | 0% | 0 | 755 |
| Aug | 80 | 70 | 12.7 | 0% | 0 | 780 |
| Sep | 81 | 70 | 12.2 | 0% | 0 | 762 |
| Oct | 80 | 69 | 12.9 | 0% | 0 | 764 |
| Nov | 78 | 68 | 15.1 | 0% | 0 | 684 |
| Dec | 76 | 65 | 14.2 | 0% | 0 | 648 |
Monthly normals 1991–2020 at Manoa Lyon Arbo 785.2, HI (500 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, Honolulu International Airport, HI, 5 miles west of Honolulu and 493 feet lower, has no 32°F night on record either, and a coolest-month low 4°F warmer (67°F).
When it snows in Honolulu, Hawaii
Measurable snow is rare here: only 0 of 20 winters from 1991 to 2020 recorded 0.1 inch or more at Nuuanu Rsch 5 775, HI, 1.5 miles away, so there is no typical first-snow date to plan around.
Where these figures come from
ZIP 96817 is 4 miles from Manoa Lyon Arbo 785.2, HI, which stands at 500 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 2 other ZIP codes share the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 96817 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.