USDA Hardiness Zone 12b
Frost Dates for 96749 — Keaau, Hawaii
NOAA 1991–2020 normals from Hilo 5 S, HI (622 ft), 5 miles west.
Updated
No night at or below 32°F was recorded at Hilo 5 S, HI in 1991–2020, not even 36°F, so Keaau has no frost dates to plan around; the coolest month, January, averages a low of 61°F.
- Winters with a freeze
- 0%
- Winters with 36°F
- 0%
- Coldest month low
- 61°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 Keaau
Hilo 5 S, HI, 5 miles west of Keaau, 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 Hilo 5 S, 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 96749 →Compare Keaau with another place →
Weather by month in Keaau
August is the warmest month at Hilo 5 S, HI, averaging 80°F by day and 67°F at night; January is the coldest at 75°F and 61°F. Not one month recorded a 32°F night; the lowest monthly average low is 61°F.
Warmth for growing adds up to 7,536 growing degree days a year (base 50°F), fewer than at 83% of the 35 Hawaii stations. 47% of them (3,514) have built up by the end of June, and August adds the most, 729. Precipitation totals 151.4 inches a year, most in November (17.8") and least in June (9.1"); May to September bring 36% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 75 | 61 | 10.1 | 0% | 0 | 558 |
| Feb | 76 | 61 | 12.9 | 0% | 0 | 512 |
| Mar | 75 | 62 | 15.4 | 0% | 0 | 574 |
| Apr | 76 | 62 | 12.6 | 0% | 0 | 579 |
| May | 77 | 64 | 9.6 | 0% | 0 | 637 |
| Jun | 79 | 65 | 9.1 | 0% | 0 | 654 |
| Jul | 79 | 66 | 12.0 | 0% | 0 | 699 |
| Aug | 80 | 67 | 12.8 | 0% | 0 | 729 |
| Sep | 80 | 66 | 11.2 | 0% | 0 | 695 |
| Oct | 79 | 65 | 13.3 | 0% | 0 | 693 |
| Nov | 77 | 64 | 17.8 | 0% | 0 | 620 |
| Dec | 76 | 62 | 14.6 | 0% | 0 | 587 |
Monthly normals 1991–2020 at Hilo 5 S, HI (622 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, Hilo International Airport, HI, 7 miles northwest of Keaau and 584 feet lower, has no 32°F night on record either, and a coolest-month low 3°F warmer (64°F).
When it snows in Keaau, Hawaii
Measurable snow is rare here: only 0 of 20 winters from 1991 to 2020 recorded 0.1 inch or more at Waiakea Scd 88.2, HI, 8.2 miles away, so there is no typical first-snow date to plan around.
Where these figures come from
ZIP 96749 is 5 miles from Hilo 5 S, HI, which stands at 622 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 96749 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.