Clewiston, Florida climate: Normal weather by month, frost dates and records
Clewiston's normal year runs from 51°F January nights to 92°F August afternoons, with 46.2 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 23.3°C, January lows of 11°C, August highs of 33°C, 1,174 mm of precipitation a year.
- NOAA stationClewiston #2
- Station IDUSC00081651
- Location26.74°N 81.05°W
- Elevation18 ft (6 m)
- Population7,496
On October 14, the normal high in Clewiston is 87°F and the normal low 68°F, and the chance of measurable rain or snow is 20%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Clewiston.
- Jan 74° 51°
- Feb 77° 54°
- Mar 80° 57°
- Apr 85° 62°
- May 88° 67°
- Jun 90° 72°
- Jul 92° 74°
- Aug 92° 74°
- Sep 90° 73°
- Oct 87° 68°
- Nov 81° 59°
- Dec 76° 54°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Clewiston each month?
August is the warmest month, with normal highs of 92°F; January the coldest, with normal lows of 51°F. The most precipitation falls in August (7.88 in), the least in November (1.05 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 74°F | 51°F | 62.3°F | 2.06 | 3 | <1 | 1 | 10 h 40 min |
| February | 77°F | 54°F | 65.8°F | 1.77 | 4 | 1 | <1 | 11 h 10 min |
| March | 80°F | 57°F | 68.4°F | 2.27 | 5 | 1 | <1 | 12 h |
| April | 85°F | 62°F | 73.2°F | 2.38 | 5 | 6 | <1 | 12 h 50 min |
| May | 88°F | 67°F | 77.9°F | 4.29 | 7 | 14 | <1 | 13 h 30 min |
| June | 90°F | 72°F | 81.1°F | 7.21 | 13 | 20 | <1 | 13 h 50 min |
| July | 92°F | 74°F | 82.7°F | 7.27 | 14 | 24 | <1 | 13 h 40 min |
| August | 92°F | 74°F | 82.8°F | 7.88 | 15 | 25 | <1 | 13 h 10 min |
| September | 90°F | 73°F | 81.4°F | 6.20 | 13 | 19 | <1 | 12 h 20 min |
| October | 87°F | 68°F | 77.2°F | 2.10 | 5 | 6 | <1 | 11 h 30 min |
| November | 81°F | 59°F | 70.3°F | 1.05 | 4 | 1 | <1 | 10 h 50 min |
| December | 76°F | 54°F | 64.7°F | 1.74 | 4 | <1 | 1 | 10 h 30 min |
| Year (annual) | 84°F | 64°F | 74.0°F | 46.22 | 91 | 115 | 2 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 23°C | 11°C | 16.8°C | 52 mm |
| February | 25°C | 12°C | 18.8°C | 45 mm |
| March | 27°C | 14°C | 20.2°C | 58 mm |
| April | 29°C | 17°C | 22.9°C | 60 mm |
| May | 31°C | 20°C | 25.5°C | 109 mm |
| June | 32°C | 22°C | 27.3°C | 183 mm |
| July | 33°C | 23°C | 28.2°C | 185 mm |
| August | 33°C | 23°C | 28.2°C | 200 mm |
| September | 32°C | 23°C | 27.4°C | 157 mm |
| October | 30°C | 20°C | 25.1°C | 53 mm |
| November | 27°C | 15°C | 21.3°C | 27 mm |
| December | 24°C | 12°C | 18.2°C | 44 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00081651; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
When is the best weather to visit Clewiston?
Normal highs sit between 65°F and 85°F in January, February, March, April, November and December. Of those, January has the fewest days with rain (3).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00081651.
When is the last frost in Clewiston?
In Clewiston, the last spring frost (32°F) comes after January 27 in half of years and after February 27 in one year in ten; the first autumn frost comes before January 13 in half of years and before December 21 in one year in ten. A night at 32°F or colder comes at all in 54% of years here (NOAA).
- Last spring frost, half of years after
- January 271 year in 10 after February 27; 9 in 10 after January 1
- First autumn frost, half of years before
- January 131 year in 10 before December 21; 9 in 10 before February 14
NOAA puts the median frost-free season at 357 days, and the season without a hard freeze (28°F) at 365 days.
A hard freeze (28°F) comes after January 18 in half of springs and before January 11 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Clewiston in zone 10a in ZIP code 33440, the nearest ZIP area.
Frost dates for every NOAA station in Florida · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00081651; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
How hot and how cold does it get in Clewiston?
In a normal year in Clewiston, 115 days a year reach 90°F (1 of them 100°F or more), 2 nights fall to 32°F or colder and 91 days bring measurable precipitation.
- Days at 90°F or more
- 115a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 2a normal year
- Days that stay below freezing
- fewer than 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 91a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00081651.
How sunny is Clewiston?
Over a year 81% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Clewiston, 5.0 kWh per square metre a day. April is the sunniest month (86%) and June the cloudiest (76%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 82% | 3.7 |
| February | 84% | 4.5 |
| March | 84% | 5.5 |
| April | 86% | 6.3 |
| May | 84% | 6.5 |
| June | 76% | 5.8 |
| July | 76% | 5.7 |
| August | 76% | 5.4 |
| September | 78% | 5.0 |
| October | 83% | 4.6 |
| November | 84% | 3.9 |
| December | 82% | 3.4 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How much heating and cooling does Clewiston need?
A normal year in Clewiston brings 403 heating degree days, 92% fewer than the median U.S. place (5,373), and 3,698 cooling degree days, 4.1 times the median (908). No month reaches 300 heating degree days. For gardens and crops, NOAA counts 8,786 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 146 | 63 |
| February | 74 | 97 |
| March | 43 | 148 |
| April | 10 | 256 |
| May | 0 | 400 |
| June | 0 | 485 |
| July | 0 | 547 |
| August | 0 | 550 |
| September | 0 | 493 |
| October | 3 | 381 |
| November | 27 | 186 |
| December | 101 | 93 |
| Year (annual) | 403 | 3,698 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00081651. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
How does Clewiston's climate compare?
Clewiston is warmer than 73 of the other 105 places with their own NOAA record in Florida, and wetter than 6. Across the 7,247 U.S. stations with normals, its annual mean of 74.0°F is warmer than 98%.
In the Köppen classification computed from these normals, Clewiston is Cfa: temperate, no dry season, hot summer. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Which places near Clewiston share this climate record?
Harlem has no NOAA station with 1991-2020 normals of its own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Harlem, FL3,050 people · 6 mi E
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about Clewiston's climate
What is the coldest month in Clewiston?
January, with a normal high of 74°F and a normal low of 51°F. The warmest is August (92°F by day, 74°F at night).
What is the rainiest month in Clewiston?
August, with 7.88 in of precipitation in a normal year; the driest is November with 1.05 in.
What plant hardiness zone is Clewiston in?
The USDA's 2023 map puts Clewiston in zone 10a in ZIP code 33440, the nearest ZIP area.
How late can frost come in Clewiston?
In half of years the last 32°F night comes after January 27; in one year in ten it comes after February 27. Waiting until February 27 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Florida climateThe statewide normals and every place in the state
- Devils Garden, FL6 miles from this station, 74.3°F a year
- Moore Haven, FL7 miles from this station, 73.2°F a year
- Ortona Lock 2, FL16 miles from this station, 73.0°F a year
- Brighton Reservation, FL21 miles from this station, 74.1°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made