USDA Hardiness Zone 13a
Frost Dates for 00985 — Carolina, Puerto Rico
NOAA 1991–2020 normals from WFO San Juan, PR (10 ft), 5 miles northwest.
Updated
No night at or below 32°F was recorded at WFO San Juan, PR in 1991–2020, not even 36°F, so Carolina has no frost dates to plan around; the coolest month, January, averages a low of 70°F.
- Winters with a freeze
- 0%
- Winters with 36°F
- 0%
- Coldest month low
- 70°F
- Hardiness zone
- 13a
32°F or below, 1991–2020
frost possible on leaves
average, January
60 to 65°F (15.6 to 18.3°C) coldest night
Frost risk by date in Carolina
WFO San Juan, PR, 5 miles northwest of Carolina, 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 WFO San Juan, 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 00985 →Compare Carolina with another place →
Weather by month in Carolina
August is the warmest month at WFO San Juan, PR, averaging 89°F by day and 77°F at night; January is the coldest at 83°F and 70°F. Not one month recorded a 32°F night; the lowest monthly average low is 70°F.
Warmth for growing adds up to 10,908 growing degree days a year (base 50°F), more than at 80% of the 25 Puerto Rico stations. 48% of them (5,199) have built up by the end of June, and August adds the most, 1,017. Precipitation totals 65.4 inches a year, most in November (7.9") and least in March (2.7"); 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 | 70 | 4.6 | 0% | 0 | 825 |
| Feb | 83 | 70 | 2.8 | 0% | 0 | 745 |
| Mar | 84 | 71 | 2.7 | 0% | 0 | 842 |
| Apr | 85 | 72 | 5.3 | 0% | 0 | 864 |
| May | 87 | 75 | 6.4 | 0% | 0 | 952 |
| Jun | 89 | 76 | 4.6 | 0% | 0 | 972 |
| Jul | 88 | 76 | 6.5 | 0% | 0 | 1000 |
| Aug | 89 | 77 | 6.9 | 0% | 0 | 1017 |
| Sep | 89 | 76 | 6.4 | 0% | 0 | 974 |
| Oct | 88 | 75 | 5.6 | 0% | 0 | 975 |
| Nov | 86 | 73 | 7.9 | 0% | 0 | 884 |
| Dec | 84 | 72 | 5.7 | 0% | 0 | 860 |
Monthly normals 1991–2020 at WFO San Juan, PR (10 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, Trujillo Alto 2 SSW, PR, 6 miles southwest of Carolina, has no 32°F night on record either, and a coolest-month low 3°F colder (67°F).
Where these figures come from
ZIP 00985 is 5 miles from WFO San Juan, PR, which stands at 10 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 5 other ZIP codes share the station; its figures are presented in full for 00987 (Carolina). The 2023 USDA Plant Hardiness Zone Map lists ZIP 00985 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.