Climate Comfort Score
82/100
Excellent
2026 data Public-data reference. official source
Key West, FL Climate
Temperature, precipitation, and comfort score from NOAA NCEI 1991-2020 normals →
30-year climate normals from 2 weather stations (1991-2020).
Key West, Florida has an average annual temperature of 79°F and a climate comfort score of 82/100 (Excellent). Annual precipitation totals 43.6". Based on NOAA 30-year normals (1991–2020).
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 (≈55)
PlainClimate composite — temperature mildness, humidity, precipitation, extreme-weather frequency. Excellent for the Key West area.
Warming context for Key West
MethodologyHow the U.S. land temperature anomaly tracks against the global mean since 1900. The current NOAA 1991-2020 normal for Key West captures average conditions across the spread shown — the most recent decade is 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 | -2490% | -2494% |
| February | 73% | 10.3 | -817% | -828% |
| March | 70% | 10.8 | -399% | -412% |
| April | 75% | 10.8 | 17% | 5% |
| May | 73% | 9.1 | -404% | -410% |
| June | 72% | 8.5 | -406% | -410% |
| July | 72% | 8.2 | -408% | -411% |
| August | 74% | 8.2 | -4572% | -4580% |
| September | 75% | 9.0 | -5412% | -5413% |
| October | 78% | 10.6 | -3329% | -3329% |
| November | 82% | 9.9 | -2489% | -2496% |
| December | 75% | 10.1 | -2488% | -2494% |
Related Data
PlainEnviro
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PlainAirData
EPA air quality data — AQI readings, pollutant levels, and air quality trends
Climate Guides
Climate Insight: Key West, FL
The NOAA 1991–2020 climate normals describe Key West, Florida as a location with an annual average temperature of 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. These thirty-year averages, computed from 2 weather stations, smooth out year-to-year variability and give a baseline expectation for typical conditions in any given month.
Precipitation patterns matter as much as temperature for anyone planning to live, garden, or travel here. Key West receives roughly 43.6 inches of precipitation each year, with seasonal snowfall possible. Growing-season length varies with elevation and microclimate, with the last spring freeze near N/A and the first fall freeze near N/A. For energy use, 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. Use the monthly tables above to plan around specific windows — shoulder seasons for mild highs and lows, peak summer for August-driven heat, or deep winter for January-driven cold. All figures here are thirty-year averages: any single year may run warmer, wetter, drier, or cooler than the normal, so treat them as planning guidance rather than forecasts.
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). This score considers temperature mildness, humidity, precipitation, and extreme weather frequency.
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. Higher heating degree days indicate greater winter energy demand, while higher cooling degree days indicate greater summer cooling needs.
Where does this Key West climate data come from? ▼
All climate data comes from NOAA U.S. Climate Normals v1.0.1, covering the 30-year period from 1991 to 2020. Data is collected from 2 weather stations. These 30-year averages are the standard reference for typical weather conditions.
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
