Key W Weather Office, Florida climate: Climate normals at a NOAA weather station
Key W Weather Office's normal year runs from 63°F January nights to 90°F August afternoons, with 46.4 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 25.2°C, January lows of 17°C, August highs of 32°C, 1,179 mm of precipitation a year.
- NOAA stationKey W Weather Office
- Station IDUSC00084571
- Location24.55°N 81.79°W
- Elevation4 ft (1 m)
On October 23, the normal high in Key W Weather Office is 84°F and the normal low 74°F, and the chance of measurable rain or snow is 34%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Key W Weather Office.
- Jan 75° 63°
- Feb 77° 64°
- Mar 79° 67°
- Apr 83° 71°
- May 86° 74°
- Jun 88° 77°
- Jul 90° 78°
- Aug 90° 79°
- Sep 88° 77°
- Oct 85° 75°
- Nov 81° 70°
- Dec 77° 66°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like at Key W Weather Office each month?
August is the warmest month, with normal highs of 90°F; January the coldest, with normal lows of 63°F. The most precipitation falls in September (8.24 in), the least in March (1.41 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 75°F | 63°F | 68.8°F | 2.01 | 8 | <1 | <1 | 10 h 50 min |
| February | 77°F | 64°F | 70.4°F | 1.96 | 6 | <1 | <1 | 11 h 20 min |
| March | 79°F | 67°F | 72.8°F | 1.41 | 6 | <1 | <1 | 12 h |
| April | 83°F | 71°F | 76.8°F | 2.17 | 5 | <1 | <1 | 12 h 40 min |
| May | 86°F | 74°F | 79.8°F | 3.71 | 8 | 1 | <1 | 13 h 20 min |
| June | 88°F | 77°F | 82.4°F | 4.81 | 10 | 7 | <1 | 13 h 40 min |
| July | 90°F | 78°F | 83.8°F | 4.48 | 13 | 19 | <1 | 13 h 30 min |
| August | 90°F | 79°F | 84.1°F | 6.13 | 14 | 19 | <1 | 13 h |
| September | 88°F | 77°F | 82.7°F | 8.24 | 16 | 7 | <1 | 12 h 20 min |
| October | 85°F | 75°F | 79.9°F | 6.01 | 12 | 1 | <1 | 11 h 40 min |
| November | 81°F | 70°F | 75.2°F | 3.28 | 7 | <1 | <1 | 11 h |
| December | 77°F | 66°F | 71.5°F | 2.22 | 7 | <1 | <1 | 10 h 40 min |
| Year (annual) | 83°F | 72°F | 77.3°F | 46.43 | 112 | 54 | <1 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 24°C | 17°C | 20.4°C | 51 mm |
| February | 25°C | 18°C | 21.3°C | 50 mm |
| March | 26°C | 19°C | 22.7°C | 36 mm |
| April | 28°C | 22°C | 24.9°C | 55 mm |
| May | 30°C | 23°C | 26.6°C | 94 mm |
| June | 31°C | 25°C | 28.0°C | 122 mm |
| July | 32°C | 25°C | 28.8°C | 114 mm |
| August | 32°C | 26°C | 28.9°C | 156 mm |
| September | 31°C | 25°C | 28.2°C | 209 mm |
| October | 30°C | 24°C | 26.6°C | 153 mm |
| November | 27°C | 21°C | 24.0°C | 83 mm |
| December | 25°C | 19°C | 21.9°C | 56 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00084571; 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.
Which months are mildest at Key W Weather Office?
Normal highs sit between 65°F and 85°F in January, February, March, April, November and December. Of those, April has the fewest days with rain (5).
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 USC00084571.
How hot and how cold does it get at Key W Weather Office?
In a normal year in Key W Weather Office, 54 days a year reach 90°F, nights almost never fall to freezing and 112 days bring measurable precipitation.
- Days at 90°F or more
- 54a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- fewer than 1a normal year
- Days that stay below freezing
- fewer than 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 112a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00084571.
How sunny is it at Key W Weather Office?
Over a year 85% of the sunlight that would reach the ground under clear skies gets through the clouds at Key W Weather Office, 5.4 kWh per square metre a day. April is the sunniest month (90%) and January the cloudiest (81%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 81% | 3.9 |
| February | 85% | 4.8 |
| March | 89% | 5.9 |
| April | 90% | 6.6 |
| May | 88% | 6.7 |
| June | 83% | 6.3 |
| July | 85% | 6.3 |
| August | 85% | 6.1 |
| September | 82% | 5.4 |
| October | 84% | 4.8 |
| November | 84% | 4.1 |
| December | 83% | 3.6 |
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 many heating and cooling degree days does Key W Weather Office record?
A normal year at Key W Weather Office brings 56 heating degree days, 99% fewer than the median U.S. place (5,373), and 4,574 cooling degree days, 5.0 times the median (908). No month reaches 300 heating degree days. For gardens and crops, NOAA counts 9,993 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 24 | 142 |
| February | 16 | 167 |
| March | 5 | 247 |
| April | 0 | 354 |
| May | 0 | 459 |
| June | 0 | 522 |
| July | 0 | 583 |
| August | 0 | 592 |
| September | 0 | 530 |
| October | 0 | 462 |
| November | 1 | 307 |
| December | 11 | 211 |
| Year (annual) | 56 | 4,574 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00084571. 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.
Have recent years at Key W Weather Office been warmer than normal?
2025 averaged 78.4°F, 1.1°F above the 1991-2020 normal of 77.3°F. 5 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 78.2°F | +0.9°F | 37.28 |
| 2022 | 78.6°F | +1.3°F | 39.52 |
| 2023 | 79.4°F | +2.1°F | 38.76 |
| 2024 | 78.7°F | +1.4°F | 50.39 |
| 2025 | 78.4°F | +1.1°F | 42.99 |
Source: observed years: ACIS, station USC00084571. A year counts only with all twelve months complete.
How does Key W Weather Office's climate compare?
Key W Weather Office is warmer than 100 of the 106 places with their own NOAA record in Florida, and wetter than 7. Across the 7,247 U.S. stations with normals, its annual mean of 77.3°F is warmer than 100%.
In the Köppen classification computed from these normals, Key W Weather Office is Aw: tropical savanna. 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.
Questions about Key W Weather Office's climate
What is the coldest month at Key W Weather Office?
January, with a normal high of 75°F and a normal low of 63°F. The warmest is August (90°F by day, 79°F at night).
What is the rainiest month at Key W Weather Office?
September, with 8.24 in of precipitation in a normal year; the driest is March with 1.41 in.
What plant hardiness zone is Key W Weather Office in?
The USDA's 2023 map puts Key W Weather Office in zone 11b in ZIP code 33040, the nearest ZIP area.
Nearby and next
- Florida climateThe statewide normals and every place in the state
- Key West, FL2 miles from this station, 78.9°F a year
- Bahia Honda State Park, FL33 miles from this station, 77.6°F a year
- Marathon, FL48 miles from this station, 78.8°F a year
- Curry Hammock State Park, FL52 miles from this station, 77.8°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made