USDA Hardiness Zone 10b
Frost Dates for 33711 — St Petersburg, Florida
NOAA 1991–2020 normals from St Petersburg, FL (8 ft), 4 miles east.
Updated
Frost is not a yearly event in St Petersburg: a night at or below 32°F came in 11% of the winters of 1991–2020 at St Petersburg, FL, and a 36°F night, cold enough for frost on exposed leaves, in 41%. There is no reliable "last frost date" here; most years have none.
- Winters with a freeze
- 11%
- Winters with 36°F
- 41%
- Coldest month low
- 54°F
- Hardiness zone
- 10b
32°F or below, 1991–2020
frost possible on leaves
average, January
35 to 40°F (1.7 to 4.4°C) coldest night
- First snow
- Rare
- Last snow
- Rare
- Winters with snow
- 0%
- Snow per year
- 0"
median, 1991–2020
median, 1991–2020
0 of 21 observed
NOAA normal
Frost risk by date in St Petersburg
At St Petersburg, FL, 4 miles east of St Petersburg, 11% of the winters of 1991–2020 had at least one night at or below 32°F, 1% reached 28°F. Even a 36°F night came in only 41% of winters. January is the month most likely to bring one: a 7% chance in a given year. 56 of the 158 other Florida stations behind this site's ZIP pages freeze in fewer than half of winters too.
Freeze probabilities 1991–2020 at St Petersburg, FL, 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 33711 →Compare St Petersburg with another place →
Weather by month in St Petersburg
August is the warmest month at St Petersburg, FL, averaging 91°F by day and 77°F at night; January is the coldest at 70°F and 54°F. Every month stays under a 10% chance of a 32°F night; January is the likeliest at 7%.
Warmth for growing adds up to 8,965 growing degree days a year (base 50°F), more than at 75% of the 158 Florida stations. 44% of them (3,985) have built up by the end of June, and August adds the most, 1,052. Precipitation totals 52.5 inches a year, most in August (9.3") and least in November (1.6"); May to September bring 66% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 70 | 54 | 3.0 | 7% | <1 | 381 |
| Feb | 73 | 57 | 2.2 | 2% | <1 | 412 |
| Mar | 77 | 61 | 2.9 | 0% | 0 | 580 |
| Apr | 82 | 66 | 2.6 | 0% | 0 | 719 |
| May | 87 | 72 | 2.5 | 0% | 0 | 908 |
| Jun | 90 | 76 | 7.2 | 0% | 0 | 986 |
| Jul | 91 | 77 | 8.4 | 0% | 0 | 1051 |
| Aug | 91 | 77 | 9.3 | 0% | 0 | 1052 |
| Sep | 89 | 76 | 7.5 | 0% | 0 | 972 |
| Oct | 84 | 70 | 2.5 | 0% | 0 | 842 |
| Nov | 77 | 63 | 1.6 | 0% | 0 | 599 |
| Dec | 72 | 58 | 2.8 | 2% | 0 | 465 |
Monthly normals 1991–2020 at St Petersburg, FL (8 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, St Petersburg International Airport, FL, 11 miles north of St Petersburg, has a 32°F night in 23% of winters against 11% here, and a coolest-month low 1°F colder (53°F).
When it snows in St Petersburg, Florida
Measurable snow is rare here: only 0 of 21 winters from 1991 to 2020 recorded 0.1 inch or more at St Petersburg, FL, 3.9 miles away, so there is no typical first-snow date to plan around.
Where these figures come from
ZIP 33711 is 4 miles from St Petersburg, FL, which stands at 8 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 11 other ZIP codes share the station; its figures are presented in full for 33710 (St Petersburg). The 2023 USDA Plant Hardiness Zone Map lists ZIP 33711 in zone 10b, the band where the coldest night of the year averaged 35 to 40°F (1.7 to 4.4°C) over 1991–2020; a zone describes winter lows, not frost dates.
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.