USDA Hardiness Zone 12b
Frost Dates for 96825 — Honolulu, Hawaii
NOAA 1991–2020 normals from Waimanalo Exp F 795.1, HI (64 ft), 3 miles north.
Updated
No night at or below 32°F was recorded at Waimanalo Exp F 795.1, 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 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, 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
Waimanalo Exp F 795.1, HI, 3 miles north 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 Waimanalo Exp F 795.1, 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 96825 →Compare Honolulu with another place →
Weather by month in Honolulu
August is the warmest month at Waimanalo Exp F 795.1, HI, averaging 85°F by day and 74°F at night; January is the coldest at 78°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 9,437 growing degree days a year (base 50°F), more than at 63% of the 35 Hawaii stations. 46% of them (4,345) have built up by the end of June, and August adds the most, 919. Precipitation totals 42.6 inches a year, most in December (5.5") and least in June (1.3"); May to September bring 24% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 78 | 65 | 4.8 | 0% | 0 | 667 |
| Feb | 78 | 65 | 4.5 | 0% | 0 | 608 |
| Mar | 79 | 67 | 5.4 | 0% | 0 | 701 |
| Apr | 80 | 69 | 3.3 | 0% | 0 | 732 |
| May | 81 | 70 | 2.4 | 0% | 0 | 798 |
| Jun | 83 | 73 | 1.3 | 0% | 0 | 840 |
| Jul | 84 | 74 | 1.9 | 0% | 0 | 901 |
| Aug | 85 | 74 | 2.0 | 0% | 0 | 919 |
| Sep | 85 | 74 | 2.6 | 0% | 0 | 885 |
| Oct | 84 | 73 | 3.5 | 0% | 0 | 879 |
| Nov | 82 | 71 | 5.4 | 0% | 0 | 782 |
| Dec | 79 | 68 | 5.5 | 0% | 0 | 727 |
Monthly normals 1991–2020 at Waimanalo Exp F 795.1, HI (64 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, Manoa Lyon Arbo 785.2, HI, 7 miles west of Honolulu and 436 feet higher, has no 32°F night on record either, and a coolest-month low 2°F colder (63°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 Paiko Drive 723.4, HI, 2.5 miles away, so there is no typical first-snow date to plan around.
Where these figures come from
ZIP 96825 is 3 miles from Waimanalo Exp F 795.1, HI, which stands at 64 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 96825 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.