USDA Hardiness Zone 13a
Frost Dates for 00791 — Humacao, Puerto Rico
NOAA 1991–2020 normals from Juncos 1 SE, PR (213 ft), 8 miles northwest.
Updated
No night at or below 32°F was recorded at Juncos 1 SE, PR in 1991–2020, not even 36°F, so Humacao 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
- 13a
32°F or below, 1991–2020
frost possible on leaves
average, February
60 to 65°F (15.6 to 18.3°C) coldest night
Frost risk by date in Humacao
Juncos 1 SE, PR, 8 miles northwest of Humacao, did not record a night at or below 32°F in 1991–2020. All 25 other Puerto Rico stations behind this site's ZIP pages recorded no 32°F night either.
Freeze probabilities 1991–2020 at Juncos 1 SE, PR, 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 00791 →Compare Humacao with another place →
Weather by month in Humacao
August is the warmest month at Juncos 1 SE, PR, averaging 89°F by day and 72°F at night; January is the coldest at 82°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 9,991 growing degree days a year (base 50°F), fewer than at 72% of the 25 Puerto Rico stations. 47% of them (4,723) have built up by the end of June, and August adds the most, 942. Precipitation totals 67.5 inches a year, most in September (8.7") and least in February (2.5"); May to September bring 51% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 82 | 65 | 3.3 | 0% | 0 | 733 |
| Feb | 83 | 65 | 2.5 | 0% | 0 | 665 |
| Mar | 84 | 65 | 2.9 | 0% | 0 | 760 |
| Apr | 85 | 68 | 4.8 | 0% | 0 | 791 |
| May | 86 | 71 | 6.4 | 0% | 0 | 879 |
| Jun | 88 | 72 | 5.2 | 0% | 0 | 896 |
| Jul | 88 | 72 | 7.0 | 0% | 0 | 935 |
| Aug | 89 | 72 | 7.2 | 0% | 0 | 942 |
| Sep | 89 | 72 | 8.7 | 0% | 0 | 908 |
| Oct | 87 | 71 | 7.6 | 0% | 0 | 905 |
| Nov | 85 | 69 | 7.7 | 0% | 0 | 813 |
| Dec | 83 | 66 | 4.2 | 0% | 0 | 766 |
Monthly normals 1991–2020 at Juncos 1 SE, PR (213 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, Pico Del Este, PR, 9 miles northeast of Humacao and 3,235 feet higher, has no 32°F night on record either, and a coolest-month low 6°F colder (59°F).
Where these figures come from
ZIP 00791 is 8 miles from Juncos 1 SE, PR, which stands at 213 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 4 other ZIP codes share the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 00791 in zone 13a, the band where the coldest night of the year averaged 60 to 65°F (15.6 to 18.3°C) over 1991–2020; a zone describes winter lows, not frost dates.
Frost dates across Puerto Rico →
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.