USDA Hardiness Zone 10a
Frost Dates for 33920 — Alva, Florida
NOAA 1991–2020 normals from La Belle, FL (16 ft), 12 miles east.
Updated
A freeze (32°F) reaches Alva in 78% of winters. When it does, the first freeze of winter comes around January 8 and the last freeze of winter around February 2; after March 11 the chance of another is under 8%.
- Last freeze
- February 2
- First freeze
- January 8
- Winters with a freeze
- 78%
- 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
- —
median, 1991–2020
median, 1991–2020
0 of 16 observed
NOAA normal
Frost risk by date in Alva
In the 78% of winters that bring a 32°F night, half of winters at La Belle, FL see their last 32°F night by February 2; only one in ten is past it by January 4, and one in ten still has one after March 11. Counting the winters with no freeze at all, the risk of a 32°F night after March 11 is under 8% and after February 2 39%. The 37 days between the even-odds date and the one-in-ten date is the widest 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 8 in half of years, as early as December 16 one year in ten, and holds off past February 11 one year in ten. A hard freeze of 28°F is less common: it came in 43% of winters. On average 3 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 15 days longer, to about February 17, and return around December 29. A 24°F night is unusual: 13% of winters had one.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F97% of yrs | Jan 17 | Jan 26 | Feb 1 | Feb 7 | Feb 17 | Feb 25 | Mar 2 | Mar 10 | Mar 19 |
| 32°F78% of yrs | Jan 4 | Jan 14 | Jan 20 | Jan 28 | Feb 2 | Feb 10 | Feb 19 | Feb 28 | Mar 11 |
| 28°F43% of yrs | too rare for a date | ||||||||
| 24°F13% of yrs | too rare for a date | ||||||||
| 20°F3% of yrs | too rare for a date | ||||||||
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F97% of yrs | Dec 1 | Dec 8 | Dec 15 | Dec 22 | Dec 29 | Jan 1 | Jan 6 | Jan 13 | Jan 23 |
| 32°F78% of yrs | Dec 16 | Dec 26 | Jan 1 | Jan 5 | Jan 8 | Jan 14 | Jan 20 | Jan 30 | Feb 11 |
| 28°F43% of yrs | too rare for a date | ||||||||
| 24°F13% of yrs | too rare for a date | ||||||||
| 20°F3% of yrs | too rare for a date | ||||||||
Freeze probabilities 1991–2020 at La Belle, 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 33920 →Compare Alva with another place →
Weather by month in Alva
August is the warmest month at La Belle, FL, averaging 92°F by day and 73°F at night; January is the coldest at 75°F and 49°F. From April to November the chance of a 32°F night stays under 10% each month. In spring, February still brings one in 30% of years and March still brings one in 16% of years.
Warmth for growing adds up to 8,699 growing degree days a year (base 50°F), more than at 66% of the 158 Florida stations. 44% of them (3,866) have built up by the end of June, and August adds the most, 1,009.
| Month | High °F | Low °F | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|
| Jan | 75 | 49 | 55% | 2 | 393 |
| Feb | 79 | 53 | 30% | 1 | 449 |
| Mar | 81 | 55 | 16% | <1 | 566 |
| Apr | 86 | 60 | 0% | 0 | 686 |
| May | 89 | 65 | 0% | 0 | 846 |
| Jun | 91 | 71 | 0% | 0 | 927 |
| Jul | 92 | 72 | 0% | 0 | 980 |
| Aug | 92 | 73 | 0% | 0 | 1009 |
| Sep | 91 | 72 | 0% | 0 | 941 |
| Oct | 87 | 67 | 0% | 0 | 832 |
| Nov | 81 | 59 | 0% | 0 | 594 |
| Dec | 77 | 53 | 22% | 1 | 477 |
Monthly normals 1991–2020 at La Belle, FL (16 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, Fort Myers SW Fl Regional Airport, FL, 15 miles southwest of Alva, has a 32°F night in 15% of winters against 78% here, and a coolest-month low 5°F warmer (54°F).
When it snows in Alva, Florida
Measurable snow is rare here: only 0 of 16 winters from 1991 to 2020 recorded 0.1 inch or more at La Belle, FL, 12 miles away, so there is no typical first-snow date to plan around.
Where these figures come from
ZIP 33920 is 12 miles from La Belle, FL, which stands at 16 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station; its figures are presented in full for 33935 (Labelle). The 2023 USDA Plant Hardiness Zone Map lists ZIP 33920 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.