USDA Hardiness Zone 13a
Frost Dates for 00976 — Trujillo Alto, Puerto Rico
NOAA 1991–2020 normals from Trujillo Alto 2 SSW, PR (115 ft), 2 miles southwest.
Updated
No night at or below 32°F was recorded at Trujillo Alto 2 SSW, PR in 1991–2020, not even 36°F, so Trujillo Alto has no frost dates to plan around; the coolest month, February, averages a low of 67°F.
- Winters with a freeze
- 0%
- Winters with 36°F
- 0%
- Coldest month low
- 67°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 Trujillo Alto
Trujillo Alto 2 SSW, PR, 2 miles southwest of Trujillo Alto, 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 Trujillo Alto 2 SSW, 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 00976 →Compare Trujillo Alto with another place →
Weather by month in Trujillo Alto
September is the warmest month at Trujillo Alto 2 SSW, PR, averaging 90°F by day and 73°F at night; January is the coldest at 83°F and 67°F. Not one month recorded a 32°F night; the lowest monthly average low is 67°F.
Warmth for growing adds up to 10,437 growing degree days a year (base 50°F), more than at 64% of the 25 Puerto Rico stations. 47% of them (4,950) have built up by the end of June, and August adds the most, 967. Precipitation totals 72.9 inches a year, most in September (8.5") and least in February (3.3"); May to September bring 47% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 83 | 67 | 5.0 | 0% | 0 | 781 |
| Feb | 84 | 67 | 3.3 | 0% | 0 | 710 |
| Mar | 85 | 67 | 3.7 | 0% | 0 | 805 |
| Apr | 86 | 69 | 5.9 | 0% | 0 | 825 |
| May | 88 | 71 | 6.9 | 0% | 0 | 907 |
| Jun | 89 | 72 | 4.5 | 0% | 0 | 923 |
| Jul | 89 | 73 | 7.1 | 0% | 0 | 961 |
| Aug | 89 | 73 | 7.5 | 0% | 0 | 967 |
| Sep | 90 | 73 | 8.5 | 0% | 0 | 941 |
| Oct | 89 | 72 | 7.6 | 0% | 0 | 949 |
| Nov | 87 | 71 | 7.9 | 0% | 0 | 860 |
| Dec | 84 | 68 | 5.0 | 0% | 0 | 811 |
Monthly normals 1991–2020 at Trujillo Alto 2 SSW, PR (115 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, Rio Piedras Exp Stn, PR, 4 miles northwest of Trujillo Alto, has no 32°F night on record either, and a coolest-month low 2°F colder (65°F).
Where these figures come from
ZIP 00976 is 2 miles from Trujillo Alto 2 SSW, PR, which stands at 115 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 00976 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.