Duck Key, FL Climate: Temperature & Rain by Month
Average temperature and precipitation from NOAA NCEI 1991–2020 normals →, with a derived climate comfort score
30-year climate normals (1991-2020) from Duck Key's primary NOAA station, DUCK KEY.
The climate verdict for Duck Key
Warm-season cooling demand defines Duck Key, Florida, running at more than twice its heating total. The NOAA normal records an annual average of 78°F. It scores 88/100 for climate comfort (excellent), putting it in the top third of station-mapped location scores and exceeding 89% of them.
- 78°F
- annual average temperature (NOAA normal)
- 88/100
- comfort score, above 89% of station-mapped location scores
- 40.4"
- annual precipitation
Duck Key: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00082441 · Duck Key, FL 78°F mean · 40.4" precip
TEMP-HOT · RANK-WARM · PHOTO-FINISH · PRCP-MID · SWING-NARROW · COMF-TOP · LOAD-COOL · STN-1 · BOOK-FULL
- TEMP-HOT 78°F
- RANK-WARM #6,792
- PHOTO-FINISH ≈ Miami Wso City
- PRCP-MID 40.4"
- SWING-NARROW 15°F
- COMF-TOP 88/100
- LOAD-COOL 4,672 CDD
- STN-1 USC00082441
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Miami Wso City, FL ( -0.1 °F mean)
Instrument codes from this station's NOAA 1991–2020 normals, mean temperature, corpus warmth rank, photo-finish peer station, precipitation band, seasonal swing, comfort composite, degree-day load, and field book, not a livability rating.
Mean-temperature neighbourhood
Nationwide NOAA normal poles and nearest peers, not a reprint of every FL station list.
- Duck Key (this station) 78°F
- Hot Dry Tortugas, FL 78°F
- Near John Pennekamp…, FL 78°F
- Cold Hollywood North…, FL 77°F
- Near Miami Wso City, FL 77°F
Duck Key sits in Florida, the #1 hottest U.S. state at 72.6°F statewide annual average - see all 50 hottest states ranked by NOAA normals
Climate Living Index · Duck Key
Duck Key: 84/100 · grade B
Duck Key publishes 4 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 2 missing weights rescale to 100.
PlainClimate-derived for Duck Key, not an official NOAA rating. Rankings still use Comfort Score 88/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Normal heat + freeze calendar | 0 calendar days | 100/100 · A |
| Snowfall burden | 0.0 inches/year | 90/100 · A |
| Precipitation balance | 40.4 in · 5.4 from 35 in | 81/100 · B |
| Annual temperature balance | 77.5°F · 10.0° from 67.5°F | 68/100 · C |
Duck Key · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Duck Key stays in the tropical Köppen band: Aw
Year-round heat with a pronounced dry season: tropical savanna (Aw). Class Aw is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: tropical, specifically tropical savanna.
- Köppen code
- Aw
- Group
- Tropical
- Warmest month
- 84.4°F
- Coldest month
- 69.0°F
Source: official public datasets monthly normals (1991–2020) at the city’s primary station. This is a station classification, not a mapped regional consensus.
National standing · cooling-led station
Where Duck Key sits across the climate record
Three NOAA fields for Duck Key's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- Top 1% warmest
- Among 6,861 stations, Duck Key sits in the warmer third of annual means.
- Annual precipitation
- 59th percentile wetness
- Neither arid nor torrential versus 6,352 station totals.
- Seasonal temperature swing
- Narrower than 98%
- Warmest-to-coldest month gap for Duck Key is compact versus 6,861 complete station-years.
How Duck Key compares across U.S. station-mapped locations
Duck Key's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
88 Top 11% score exceeds 89% of 6,189 station-mapped location scores
- 0–10: 0 station-mapped locations (0%). Below this entry.
- 10–20: 0 station-mapped locations (0%). Below this entry.
- 20–30: 96 station-mapped locations (2%). Below this entry.
- 30–40: 280 station-mapped locations (5%). Below this entry.
- 40–50: 1,113 station-mapped locations (18%). Below this entry.
- 50–60: 1,329 station-mapped locations (21%). Below this entry.
- 60–70: 1,236 station-mapped locations (20%). Below this entry.
- 70–80: 650 station-mapped locations (11%). Below this entry.
- 80–90: 921 station-mapped locations (15%). This entry sits in this band.
- 90–100: 564 station-mapped locations (9%). Above this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Snow | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|---|
| January | 75°F (24°C) | 63°F (17°C) | 69°F (21°C) | 1.6" | 0.0" | 0.0 | 0.0 |
| February | 77°F (25°C) | 65°F (18°C) | 71°F (22°C) | 1.9" | 0.0" | 0.0 | 0.0 |
| March | 79°F (26°C) | 68°F (20°C) | 73°F (23°C) | 1.8" | 0.0" | 0.0 | 0.0 |
| April | 82°F (28°C) | 72°F (22°C) | 77°F (25°C) | 1.8" | 0.0" | 0.0 | 0.3 |
| May | 85°F (29°C) | 75°F (24°C) | 80°F (27°C) | 2.7" | 0.0" | 0.0 | 1.0 |
| June | 88°F (31°C) | 78°F (26°C) | 83°F (28°C) | 5.1" | 0.0" | 0.0 | 5.5 |
| July | 89°F (32°C) | 79°F (26°C) | 84°F (29°C) | 3.6" | 0.0" | 0.0 | 13.6 |
| August | 89°F (32°C) | 79°F (26°C) | 84°F (29°C) | 5.7" | 0.0" | 0.0 | 17.4 |
| September | 88°F (31°C) | 78°F (25°C) | 83°F (28°C) | 6.1" | 0.0" | 0.0 | 7.6 |
| October | 84°F (29°C) | 76°F (24°C) | 80°F (27°C) | 6.0" | 0.0" | 0.0 | 0.7 |
| November | 79°F (26°C) | 70°F (21°C) | 75°F (24°C) | 2.4" | 0.0" | 0.0 | 0.0 |
| December | 77°F (25°C) | 67°F (19°C) | 72°F (22°C) | 1.7" | 0.0" | 0.0 | 0.0 |
The year, day by day
The calendar barely moves in Duck Key: no date carries a normal high of 90°F or a normal low at freezing. The year runs between 63°F near January 16 and 90°F near July 27.
No freezing date
Not one calendar date in the 1991–2020 record carries a normal low at or below 32°F. The coldest normal low of the year is 63°F around January 16.
Where the wet dates fall
The likeliest wet date is September 13, when 43% of years recorded at least a hundredth of an inch. The driest is March 3 at 13%. Summed across the calendar, that is about 91 wet dates a year.
The widest day
February 3 carries the biggest normal gap between afternoon and dawn, 12°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Duck Key.
Where Duck Key Stands Nationally
Among the steadiest day-night climates ranked: even the widest normal daily swing holds to roughly 12°F.
Duck Key earns one nationally notable standing (outer quintile) against 6,860 NOAA 1991–2020 normals stations, middle-of-the-pack metrics stay silent here.
Monthly Precipitation
Average monthly rainfall and snowfall
5.6 days with precipitation
4.6 days with precipitation
4.1 days with precipitation
3.8 days with precipitation
5.3 days with precipitation
10.4 days with precipitation
10.7 days with precipitation
10.5 days with precipitation
13.2 days with precipitation
9.7 days with precipitation
5.7 days with precipitation
6.6 days with precipitation
Duck Key runs a summer-peaked wet season
36% of Duck Key's yearly precipitation falls in June, July and August alone, against the 25% an evenly spread year would give those three months. The wettest month is September at 6.1", on an unusually narrow 15.4°F seasonal spread. Warm-season convection and, across the Southwest, the North American monsoon produce this shape: rain arrives in short heavy bursts during the hottest part of the year rather than as long cool-season soaking.
- Wettest three months: September, October, August, taking 44% of the annual total between them.
- Driest month: January at 1.6".
- Winter share: 13% falls in December, January and February.
Shares are computed from this station's own 1991-2020 monthly precipitation normals. A summer-peaked label means the June-August share reaches 35%; it describes timing across an average year, not any single season, and says nothing about how heavy an individual storm can be.
When it rains in Duck Key, it arrives in quantity
40.4" of precipitation falls across only about 90 wet days here, averaging 0.45 inches each. Fewer days carry more water: the year's total is delivered in comparatively heavy events rather than persistent damp.
- Days with measurable precipitation
- about 90 a year, 25% of all days
- Average depth per wet day
- 0.45 inches
- Most wet days
- September, about 13
- Fewest wet days
- April, about 4
A wet day is one recording at least 0.01 inches. These are 1991-2020 normals: they describe an average year, and a per-day average is not a forecast of any individual storm.
Duck Key's record shows no measurable snowfall
This station measured snowfall across the 1991-2020 period and recorded none: the annual normal is 0.0 inches. That is a measured zero rather than missing data, which is a meaningful distinction here , most stations in the database simply do not report snow at all, and those pages say nothing about it.
A thirty-year normal of zero describes the typical year at this station. It is not a claim that snow has never fallen in the area.
Frost Dates & Growing Season
First Fall Freeze
N/A
50% probability date
Last Spring Freeze
N/A
50% probability date
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
85
Higher = more heating needed
Cooling Degree Days
4,672
Higher = more cooling needed
Warmest Month
August
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside FL closest to Duck Key on two NOAA annual-normal axes (mean temperature and annual precipitation). Chip rows use distinct link sets.
Closest by average temperature
Nearest out-of-state peers by annual mean temperature (78°F here).
- Kahului, HI 77°F · 0.4°F off
- Lihue, HI 76°F · 1.2°F off
- Brownsville, TX 76°F · 1.3°F off
- Needles, CA 76°F · 1.3°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (40.4" here), excluding temperature-peer places.
- Manchester, NH 40.4" · 0.0" off
- Seldovia, AK 40.4" · 0.0" off
- Sidell, IL 40.4" · 0.0" off
- Winchester, IL 40.4" · 0.0" off
Data-derived climate profile
How Duck Key's climate pattern fits together
cooling led · moderate · low swing
Warm-season load persists through a relatively even calendar in Duck Key. Cooling totals 4,672 degree days, more than double the 85 heating measure, and the 15.4°F seasonal range is compact rather than sharply divided.
Duck Key's 40.4 inches of annual precipitation falls in PlainClimate's middle band, so “wet” or “dry” is not the leading description. Recorded annual snowfall is negligible. Temperature balance and the calendar distribution carry more information than the annual moisture label alone.
Temperature varies within a narrow 15.4°F band across the normal year. August and January mark the typical warm and cold ends of the calendar. The annual average is 78°F. Monthly rows still matter, but they refine a steady profile rather than reveal two climatic extremes.
A frost-free growing-season length is not available for Duck Key. That missing field is kept separate from the observed temperature and precipitation record rather than filled from a regional estimate.
These labels group NOAA 1991-2020 normals from Duck Key's primary station, so the summer figures are a thirty-year average rather than a ceiling: individual years have run hotter and will again. For Duck Key that means a descriptive range only — not an official NOAA classification and not a prediction for next summer.
Questions about Duck Key's climate
How much rain does Duck Key get? ▼
How many days above 90°F does Duck Key get? ▼
How much energy does heating and cooling require in Duck Key? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Duck Key's primary station: DUCK KEY (USC00082441). For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The 2024 Census Gazetteer identifies the exact name-and-state match as a census-designated place (GEOID 1218425), not an incorporated municipality. Match rule for Duck Key: exact normalized name + state only, no fuzzy expansion, so nearby differently spelled facilities stay unmatched.
On this page every temperature, precipitation, and derived score for Duck Key comes from its primary NOAA station record. No figure on this page is typed in by an editor - each value is rendered from NOAA 1991-2020 U.S. Climate Normals. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 1991–2020 normals.