USDA Hardiness Zone 11b
Frost Dates for 33050 — Marathon, Florida
NOAA 1991–2020 normals from Marathon Airport, FL (8 ft), 2 miles west.
Updated
No night at or below 32°F was recorded at Marathon Airport, FL in 1991–2020, not even 36°F, so Marathon has no frost dates to plan around; the coolest month, January, averages a low of 64°F.
- Winters with a freeze
- 0%
- Winters with 36°F
- 0%
- Coldest month low
- 64°F
- Hardiness zone
- 11b
32°F or below, 1991–2020
frost possible on leaves
average, January
45 to 50°F (7.2 to 10.0°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 16 observed
NOAA normal
Frost risk by date in Marathon
Marathon Airport, FL, 2 miles west of Marathon, did not record a night at or below 32°F in 1991–2020. 13 of the 158 other Florida stations behind this site's ZIP pages recorded no 32°F night either.
Freeze probabilities 1991–2020 at Marathon Airport, 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 33050 →Compare Marathon with another place →
Weather by month in Marathon
August is the warmest month at Marathon Airport, FL, averaging 92°F by day and 80°F at night; January is the coldest at 76°F and 64°F. Not one month recorded a 32°F night; the lowest monthly average low is 64°F.
Warmth for growing adds up to 10,532 growing degree days a year (base 50°F), more than at 99% of the 158 Florida stations. 46% of them (4,868) have built up by the end of June, and August adds the most, 1,105. Precipitation totals 39.7 inches a year, most in September (6.4") and least in March (1.3"); May to September bring 58% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 76 | 64 | 1.6 | 0% | 0 | 621 |
| Feb | 78 | 66 | 1.7 | 0% | 0 | 623 |
| Mar | 81 | 69 | 1.3 | 0% | 0 | 763 |
| Apr | 84 | 73 | 2.1 | 0% | 0 | 849 |
| May | 88 | 76 | 3.4 | 0% | 0 | 981 |
| Jun | 90 | 79 | 4.2 | 0% | 0 | 1032 |
| Jul | 91 | 79 | 3.8 | 0% | 0 | 1090 |
| Aug | 92 | 80 | 5.3 | 0% | 0 | 1105 |
| Sep | 90 | 78 | 6.4 | 0% | 0 | 1025 |
| Oct | 86 | 76 | 5.9 | 0% | 0 | 961 |
| Nov | 81 | 71 | 1.8 | 0% | 0 | 780 |
| Dec | 78 | 68 | 2.2 | 0% | 0 | 704 |
Monthly normals 1991–2020 at Marathon Airport, 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, Bahia Honda Sp, FL, 17 miles west of Marathon, has no 32°F night on record either, and the same coolest-month low, 64°F.
When it snows in Marathon, Florida
Measurable snow is rare here: only 0 of 16 winters from 1991 to 2020 recorded 0.1 inch or more at Duck Key, FL, 8 miles away, so there is no typical first-snow date to plan around.
Where these figures come from
ZIP 33050 is 2 miles from Marathon Airport, FL, which stands at 8 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 33050 in zone 11b, the band where the coldest night of the year averaged 45 to 50°F (7.2 to 10.0°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.