USDA Hardiness Zone 12b
Frost Dates for 00670 — Las Marias, Puerto Rico
NOAA 1991–2020 normals from Maricao 2 SSW, PR (2,832 ft), 6 miles south.
Updated
No night at or below 32°F was recorded at Maricao 2 SSW, PR in 1991–2020, not even 36°F, so Las Marias has no frost dates to plan around; the coolest month, February, averages a low of 62°F.
- Winters with a freeze
- 0%
- Winters with 36°F
- 0%
- Coldest month low
- 62°F
- Hardiness zone
- 12b
32°F or below, 1991–2020
frost possible on leaves
average, February
55 to 60°F (12.8 to 15.6°C) coldest night
Frost risk by date in Las Marias
Maricao 2 SSW, PR, 6 miles south of Las Marias, 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 Maricao 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 00670 →Compare Las Marias with another place →
Weather by month in Las Marias
August is the warmest month at Maricao 2 SSW, PR, averaging 80°F by day and 68°F at night; February is the coldest at 76°F and 62°F. Not one month recorded a 32°F night; the lowest monthly average low is 62°F.
Warmth for growing adds up to 7,803 growing degree days a year (base 50°F), fewer than at 96% of the 25 Puerto Rico stations. 47% of them (3,658) have built up by the end of June, and August adds the most, 738.
| Month | High °F | Low °F | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|
| Jan | 76 | 62 | 0% | 0 | 589 |
| Feb | 76 | 62 | 0% | 0 | 519 |
| Mar | 76 | 62 | 0% | 0 | 583 |
| Apr | 77 | 63 | 0% | 0 | 599 |
| May | 78 | 65 | 0% | 0 | 667 |
| Jun | 80 | 67 | 0% | 0 | 702 |
| Jul | 80 | 67 | 0% | 0 | 732 |
| Aug | 80 | 68 | 0% | 0 | 738 |
| Sep | 80 | 67 | 0% | 0 | 704 |
| Oct | 80 | 67 | 0% | 0 | 722 |
| Nov | 78 | 65 | 0% | 0 | 650 |
| Dec | 75 | 64 | 0% | 0 | 600 |
Monthly normals 1991–2020 at Maricao 2 SSW, PR (2,832 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, Mayaguez City, PR, 11 miles west of Las Marias and 2,758 feet lower, has no 32°F night on record either, and a coolest-month low 5°F warmer (67°F).
Where these figures come from
ZIP 00670 is 6 miles from Maricao 2 SSW, PR, which stands at 2,832 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 2 other ZIP codes share the station; its figures are presented in full for 00637 (Sabana Grande). The 2023 USDA Plant Hardiness Zone Map lists ZIP 00670 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.
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.