USDA Hardiness Zone 12b
Frost Dates for 00660 — Hormigueros, Puerto Rico
NOAA 1991–2020 normals from Mayaguez City, PR (74 ft), 4 miles north.
Updated
No night at or below 32°F was recorded at Mayaguez City, PR in 1991–2020, not even 36°F, so Hormigueros 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
- 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 Hormigueros
Mayaguez City, PR, 4 miles north of Hormigueros, 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 Mayaguez City, 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 00660 →Compare Hormigueros with another place →
Weather by month in Hormigueros
August is the warmest month at Mayaguez City, PR, averaging 90°F by day and 72°F at night; January is the coldest at 85°F and 68°F. Not one month recorded a 32°F night; the lowest monthly average low is 67°F.
Warmth for growing adds up to 10,662 growing degree days a year (base 50°F), more than at 72% of the 25 Puerto Rico stations. 48% of them (5,074) have built up by the end of June, and July adds the most, 970. Precipitation totals 51.3 inches a year, most in August (6.8") and least in January (1.2"); May to September bring 59% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 85 | 68 | 1.2 | 0% | 0 | 815 |
| Feb | 86 | 67 | 1.8 | 0% | 0 | 736 |
| Mar | 87 | 68 | 2.1 | 0% | 0 | 843 |
| Apr | 87 | 69 | 3.9 | 0% | 0 | 842 |
| May | 89 | 71 | 6.0 | 0% | 0 | 922 |
| Jun | 90 | 71 | 5.2 | 0% | 0 | 915 |
| Jul | 90 | 73 | 5.8 | 0% | 0 | 970 |
| Aug | 90 | 72 | 6.8 | 0% | 0 | 970 |
| Sep | 90 | 72 | 6.6 | 0% | 0 | 936 |
| Oct | 90 | 73 | 6.5 | 0% | 0 | 966 |
| Nov | 88 | 71 | 3.1 | 0% | 0 | 893 |
| Dec | 86 | 69 | 2.3 | 0% | 0 | 854 |
Monthly normals 1991–2020 at Mayaguez City, PR (74 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, Lajas Substn, PR, 8 miles southeast of Hormigueros, has no 32°F night on record either, and a coolest-month low 5°F colder (62°F).
Where these figures come from
ZIP 00660 is 4 miles from Mayaguez City, PR, which stands at 74 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 00680 (Mayaguez). The 2023 USDA Plant Hardiness Zone Map lists ZIP 00660 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.