Puerto Rico · NOAA station RQC00668814
Frost dates for WFO San Juan, PR
WFO San Juan did not record a 32°F freeze in the 1991–2020 normals period, so it has no spring or fall frost date. Frost-tender plants can grow year-round here, though cold snaps are still possible. Nearby ZIP codes are in USDA hardiness zones 13a to 13b.
- 0%Chance of 32°F in a year
- 0%Chance of 36°F in a year
- 73.5°FAverage lowest temp (annual mean min)
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 0% |
| 32°F | 0% |
| 28°F | 0% |
| 24°F | 0% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 00979 | 13b | 65 to 70°F | 1 km |
| 00983 | 13b | 65 to 70°F | 2 km |
| 00982 | 13b | 65 to 70°F | 2 km |
| 00985 | 13a | 60 to 65°F | 5 km |
| 00772 | 13a | 60 to 65°F | 9 km |
Not the official USDA Plant Hardiness Zone Map. Zones shown here are the values published in the USDA-ARS / Oregon State University PRISM Group 2023 ZIP code tables, shown unaltered. For the official interactive map, visit planthardiness.ars.usda.gov.
About this station
- NOAA station ID RQC00668814, at 18.4311, -65.9917, elevation 3 m (10 ft).
- Data quality: Representative (10+ years), 14 years of freeze data.
- Average days per year at or below 32°F: 0.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- San Juan L M Marin Airport (2 km)
- Rio Piedras Exp. Station (8 km)
- Trujillo Alto 2 SSW (12 km)
- Toa Baja Levittown (19 km)
- Gurabo Substn (19 km)
- Juncos 1 SE (24 km)
- Pico Del Este (30 km)
- Dorado 2 WNW (33 km)
Sources
- NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020, annual/seasonal normals by station (version 1.0.1), file dated June 27, 2023; documentation.
- USDA Agricultural Research Service and PRISM Group, Oregon State University, 2023 Plant Hardiness Zone Map ZIP code tables (CONUS, Alaska, Hawaii, Puerto Rico), files dated November 17, 2023. Data © PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed November 1, 2026. Official map: planthardiness.ars.usda.gov.
- U.S. Census Bureau, 2024 Gazetteer ZIP Code Tabulation Areas file, dated August 30, 2024 (ZIP centroids used to find the nearest station).
Freeze dates are 30-year probabilities, not forecasts. Check your local forecast before planting tender plants.