Climate Comfort Score
82/100
Excellent
NOAA 1991–2020 normals 79°F annual avg 2 stations
Key West, FL Climate
Average temperature, precipitation, and a comfort score, drawn from NOAA NCEI 1991–2020 normals →
- 79°F
- Avg annual temp
- 82/100
- Comfort score
- 43.6"
- Annual precip
30-year climate normals from 2 weather stations (1991-2020).
The climate verdict for Key West
Key West, Florida averages 79°F a year and scores 82/100 on the comfort index - excellent, milder than 83% of U.S. cities.
- 79°F
- yearly average temperature, NOAA normal
- 82/100
- comfort score, milder than 83% of U.S. cities
- 43.6"
- precipitation, annual total
Based on NOAA U.S. Climate Normals (1991–2020) - 30-year averages describing the typical year, not a forecast.
Avg Temperature
79°F (26°C)
Avg High
83°F
Avg Low
75°F
Annual Precip
43.6"
Annual Snow
0.0"
Comfort Score
82/100
Excellent
Avg Annual Temperature
79°F
30-year mean (NOAA NCEI)
Annual Precipitation
43.6"
Liquid-equivalent total
Comfort score vs national 100-point ceiling (Key West) 82.0%
National median (63)
PlainClimate composite, temperature mildness, humidity, precipitation, extreme-weather frequency. Excellent for the Key West area.
How Key West compares to every U.S. city
Key West's comfort score vs. all U.S. cities
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
82 Top 17% higher than 83% of 6,915 US cities
Each bar is a band; taller bars hold more US cities. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
Warming context for Key West
MethodologySince 1900, U.S. land temperatures have tracked (and diverged from) the global mean - the chart below shows how. Key West's current NOAA 1991-2020 normal sits within that longer spread, and the most recent decade runs warmer than the 30-year mean.
- United States land mean (NOAA NCEI) +0.11 °C/decade
- Global anomaly (NASA GISTEMP) +0.11 °C/decade
- Paris Agreement thresholds 1.5°C / 2.0°C
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) | 66°F (19°C) | 71°F (21°C) | 2.1" | 0.0" | 0.0 | 0.0 |
| February | 77°F (25°C) | 68°F (20°C) | 72°F (22°C) | 1.5" | 0.0" | 0.0 | 0.0 |
| March | 79°F (26°C) | 70°F (21°C) | 75°F (24°C) | 1.4" | 0.0" | 0.0 | 0.0 |
| April | 83°F (28°C) | 73°F (23°C) | 78°F (26°C) | 2.4" | 0.0" | 0.0 | 0.4 |
| May | 86°F (30°C) | 77°F (25°C) | 81°F (27°C) | 3.4" | 0.0" | 0.0 | 2.3 |
| June | 88°F (31°C) | 80°F (27°C) | 84°F (29°C) | 4.9" | 0.0" | 0.0 | 11.9 |
| July | 90°F (32°C) | 81°F (27°C) | 85°F (30°C) | 4.3" | 0.0" | 0.0 | 21.7 |
| August | 90°F (32°C) | 81°F (27°C) | 85°F (30°C) | 5.5" | 0.0" | 0.0 | 23.5 |
| September | 89°F (31°C) | 80°F (27°C) | 84°F (29°C) | 8.1" | 0.0" | 0.0 | 15.4 |
| October | 85°F (30°C) | 78°F (25°C) | 82°F (28°C) | 5.7" | 0.0" | 0.0 | 4.0 |
| November | 80°F (27°C) | 73°F (23°C) | 77°F (25°C) | 2.3" | 0.0" | 0.0 | 0.7 |
| December | 77°F (25°C) | 69°F (20°C) | 73°F (23°C) | 1.9" | 0.0" | 0.0 | 0.0 |
Monthly Precipitation
Average monthly rainfall and snowfall
January 2.1"
7.8 days with precipitation
February 1.5"
5.3 days with precipitation
March 1.4"
4.6 days with precipitation
April 2.4"
4.8 days with precipitation
May 3.4"
6.9 days with precipitation
June 4.9"
10.3 days with precipitation
July 4.3"
10.6 days with precipitation
August 5.5"
13.0 days with precipitation
September 8.1"
14.7 days with precipitation
October 5.7"
11.8 days with precipitation
November 2.3"
5.7 days with precipitation
December 1.9"
6.4 days with precipitation
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
47
Higher = more heating needed
Cooling Degree Days
5,114
Higher = more cooling needed
Warmest Month
August
Coldest Month
January
Humidity & Wind
Monthly averages from hourly observations
| Month | Humidity | Wind (mph) | Clear Sky % | Overcast % |
|---|---|---|---|---|
| January | 75% | 10.2 | 13% | 8% |
| February | 73% | 10.3 | 18% | 6% |
| March | 70% | 10.8 | 18% | 4% |
| April | 75% | 10.8 | 17% | 5% |
| May | 73% | 9.1 | 13% | 7% |
| June | 72% | 8.5 | 11% | 7% |
| July | 72% | 8.2 | 10% | 6% |
| August | 74% | 8.2 | 20% | 6% |
| September | 75% | 9.0 | 9% | 8% |
| October | 78% | 10.6 | 6% | 6% |
| November | 82% | 9.9 | 14% | 6% |
| December | 75% | 10.1 | 16% | 8% |
What Key West's climate means for you
Key West runs 79°F a year - peaking in August, coldest in January.
- Energy bills track 47 heating and 5,114 cooling degree days a year, higher means the furnace or AC runs more.
- Comparing places to live? Line this city up against nearby cities and the national rankings. See rankings
These are 30-year NOAA normals (1991–2020) - the typical year, not a forecast for any specific season.
Climate Guides
Climate Insight: Key West, FL
In Key West, Florida, the NOAA 1991–2020 climate normals put the annual average temperature at 79°F, ranging from a mean daily high of 83°F to a mean daily low of 75°F. August is typically the warmest month of the year, while January is the coldest. As thirty-year averages computed from 2 weather stations, these numbers smooth out year-to-year noise into a working baseline for a typical month.
Key West averages 43.6 inches of precipitation a year, with negligible snowfall, and that matters as much to daily life here as temperature does. Growing-season length varies with elevation and microclimate. As for energy demand, 47 heating degree days and 5,114 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.
On PlainClimate's composite comfort index, Key West scores 82/100 (Excellent), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. For planning purposes, look to the monthly tables above: shoulder seasons bring the mildest highs and lows, summer brings August-driven heat, and deep winter brings January-driven cold. Treat every figure here as a thirty-year average rather than a forecast - individual years routinely run warmer, cooler, wetter, or drier than the normal.
Frequently Asked Questions
What is the average temperature in Key West, FL? ▼
The average annual temperature in Key West, Florida is 79°F. The warmest month averages 90°F (32°C) and the coldest averages 66°F (19°C).
How much rain does Key West get? ▼
Key West receives 43.6 inches of precipitation annually. Based on NOAA 30-year climate normals (1991-2020).
What is the comfort score for Key West? ▼
Key West has a climate comfort score of 82/100 (Excellent), milder than 83% of U.S. cities in the PlainClimate database.
When is the growing season in Key West? ▼
Growing season data is not available for Key West.
How much energy does heating and cooling require in Key West? ▼
Key West has 47 heating degree days and 5,114 cooling degree days annually, a cooling-dominated climate. See our <a href="/guides/reading-weather-data/" class="underline hover:text-brand-600">guide to reading weather data</a> for what these figures mean.
Where does this Key West climate data come from? ▼
NOAA U.S. Climate Normals v1.0.1 (1991-2020), from 2 weather stations near Key West.
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). Station: USW00012850. For informational purposes only.
Read our methodology - how this data is sourced, computed, and verified.
Related
Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainClimate Editorial
Every figure on PlainClimate is rendered directly from NOAA 1991-2020 U.S. Climate Normals data, no number is typed in by an editor. This page draws directly on NOAA 1991-2020 U.S. Climate Normals data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.