USDA Hardiness Zone 10a
Frost Dates for 33440 — Clewiston, Florida
NOAA 1991–2020 normals from Clewiston #2, FL (18 ft), 4 miles northwest.
Updated
A freeze (32°F) reaches Clewiston in 54% of winters. When it does, the first freeze of winter comes around January 13 and the last freeze of winter around January 27; after February 27 the chance of another is under 5%.
- Last freeze
- January 27
- First freeze
- January 13
- Winters with a freeze
- 54%
- Hardiness zone
- 10a
50%, in freezing years
50%, in freezing years
32°F or below, 1991–2020
30 to 35°F (-1.1 to 1.7°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 20 observed
NOAA normal
Frost risk by date in Clewiston
In the 54% of winters that bring a 32°F night, half of winters at Clewiston #2, FL see their last 32°F night by January 27; only one in ten is past it by January 1, and one in ten still has one after February 27. Counting the winters with no freeze at all, the risk of a 32°F night after February 27 is under 5% and after January 27 27%. The 31 days between the even-odds date and the one-in-ten date is wider than at 91% of the 101 Florida stations behind this site's ZIP pages, so a fixed calendar date is a gamble here.
In fall the first 32°F night comes by January 13 in half of years, as early as December 21 one year in ten, and holds off past February 14 one year in ten. A hard freeze of 28°F is less common: it came in 18% of winters. On average 2 nights a year drop to 32°F or below. Nights of 36°F, when frost can still settle on leaves in low, open spots, continue 11 days longer, to about February 7, and return around January 3. A 24°F night is unusual: 3% of winters had one.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F90% of yrs | Jan 8 | Jan 19 | Jan 27 | Feb 1 | Feb 7 | Feb 15 | Feb 22 | Mar 1 | Mar 9 |
| 32°F54% of yrs | Jan 1 | Jan 9 | Jan 15 | Jan 21 | Jan 27 | Jan 31 | Feb 5 | Feb 13 | Feb 27 |
| 28°F18% of yrs | too rare for a date | ||||||||
| 24°F3% of yrs | too rare for a date | ||||||||
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F90% of yrs | Dec 1 | Dec 11 | Dec 22 | Dec 30 | Jan 3 | Jan 8 | Jan 14 | Jan 22 | Feb 3 |
| 32°F54% of yrs | Dec 21 | Dec 31 | Jan 3 | Jan 7 | Jan 13 | Jan 18 | Jan 25 | Feb 2 | Feb 14 |
| 28°F18% of yrs | too rare for a date | ||||||||
| 24°F3% of yrs | too rare for a date | ||||||||
Freeze probabilities 1991–2020 at Clewiston #2, 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 33440 →Compare Clewiston with another place →
Weather by month in Clewiston
August is the warmest month at Clewiston #2, FL, averaging 92°F by day and 74°F at night; January is the coldest at 74°F and 51°F. From March to November the chance of a 32°F night stays under 10% each month. In spring, February still brings one in 18% of years.
Warmth for growing adds up to 8,786 growing degree days a year (base 50°F), more than at 69% of the 158 Florida stations. 44% of them (3,901) have built up by the end of June, and August adds the most, 1,015. Precipitation totals 46.4 inches a year, most in August (7.9") and least in November (1.1"); May to September bring 71% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 74 | 51 | 2.1 | 36% | 1 | 392 |
| Feb | 77 | 54 | 1.8 | 18% | <1 | 443 |
| Mar | 80 | 57 | 2.3 | 4% | 0 | 571 |
| Apr | 85 | 62 | 2.4 | 0% | 0 | 696 |
| May | 88 | 67 | 4.3 | 0% | 0 | 865 |
| Jun | 90 | 72 | 7.2 | 0% | 0 | 935 |
| Jul | 92 | 74 | 7.3 | 0% | 0 | 1012 |
| Aug | 92 | 74 | 7.9 | 0% | 0 | 1015 |
| Sep | 90 | 73 | 6.2 | 0% | 0 | 944 |
| Oct | 87 | 68 | 2.1 | 0% | 0 | 843 |
| Nov | 81 | 59 | 1.1 | 0% | 0 | 609 |
| Dec | 76 | 54 | 1.7 | 12% | 1 | 462 |
Monthly normals 1991–2020 at Clewiston #2, FL (18 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, Moore Haven Lock 1, FL, 10 miles northwest of Clewiston, has a last frost 4 days earlier (January 23), a first frost 2 days earlier (January 11), a season 4 days longer.
When it snows in Clewiston, Florida
Measurable snow is rare here: only 0 of 20 winters from 1991 to 2020 recorded 0.1 inch or more at Devils Garden, FL, 6.7 miles away, so there is no typical first-snow date to plan around.
Where these figures come from
ZIP 33440 is 4 miles from Clewiston #2, FL, which stands at 18 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 33440 in zone 10a, the band where the coldest night of the year averaged 30 to 35°F (-1.1 to 1.7°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.