USDA Hardiness Zone 13a
Frost Dates for 00745 — Rio Grande, Puerto Rico
NOAA 1991–2020 normals from Pico Del Este, PR (3,448 ft), 8 miles southeast.
Updated
No night at or below 32°F was recorded at Pico Del Este, PR in 1991–2020, not even 36°F, so Rio Grande has no frost dates to plan around; the coolest month, February, averages a low of 59°F.
- Winters with a freeze
- 0%
- Winters with 36°F
- 0%
- Coldest month low
- 59°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 Rio Grande
Pico Del Este, PR, 8 miles southeast of Rio Grande, 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 Pico Del Este, 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 00745 →Compare Rio Grande with another place →
Weather by month in Rio Grande
September is the warmest month at Pico Del Este, PR, averaging 72°F by day and 64°F at night; February is the coldest at 66°F and 59°F. Not one month recorded a 32°F night; the lowest monthly average low is 59°F.
Warmth for growing adds up to 5,554 growing degree days a year (base 50°F), the fewest of the 25 Puerto Rico stations. 45% of them (2,521) have built up by the end of June, and August adds the most, 544.
| Month | High °F | Low °F | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|
| Jan | 66 | 59 | 0% | 0 | 392 |
| Feb | 66 | 59 | 0% | 0 | 346 |
| Mar | 67 | 59 | 0% | 0 | 398 |
| Apr | 68 | 60 | 0% | 0 | 408 |
| May | 69 | 62 | 0% | 0 | 484 |
| Jun | 70 | 63 | 0% | 0 | 494 |
| Jul | 70 | 63 | 0% | 0 | 518 |
| Aug | 71 | 64 | 0% | 0 | 544 |
| Sep | 72 | 64 | 0% | 0 | 537 |
| Oct | 71 | 64 | 0% | 0 | 543 |
| Nov | 69 | 62 | 0% | 0 | 467 |
| Dec | 67 | 60 | 0% | 0 | 425 |
Monthly normals 1991–2020 at Pico Del Este, PR (3,448 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, Juncos 1 SE, PR, 11 miles southwest of Rio Grande and 3,235 feet lower, has no 32°F night on record either, and a coolest-month low 6°F warmer (65°F).
Where these figures come from
ZIP 00745 is 8 miles from Pico Del Este, PR, which stands at 3,448 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 3 other ZIP codes share the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 00745 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.