Climateby Month

Key Largo, FL climate by month

NOAA 1991-2020 normals · 8 ft elevation

Key Largo has hot and oppressively humid summers and mild winters. Highs peak at 93°F in August and fall to 78°F in January. The wettest month is August (about 19 wet days) and the driest is April (about 6). By our comfort score the best months are January, February and March.

Warmest month
93°F
August normal high
Coldest month
55°F
January normal low
Wet days a year
136
57.4 in of precipitation
Muggy days a year
266
dew point 65°F or higher

How warm is Key Largo?

Normal highs range from 78°F in January to 93°F in August.

50°60°70°80°90°100° January: normal high 78°F (26°C), low 55°F (13°C) 78° 55° February: normal high 81°F (27°C), low 57°F (14°C) March: normal high 83°F (28°C), low 58°F (14°C) April: normal high 86°F (30°C), low 62°F (17°C) May: normal high 89°F (32°C), low 67°F (19°C) June: normal high 91°F (33°C), low 72°F (22°C) July: normal high 93°F (34°C), low 74°F (23°C) 93° 74° August: normal high 93°F (34°C), low 74°F (23°C) September: normal high 91°F (33°C), low 74°F (23°C) October: normal high 88°F (31°C), low 71°F (22°C) November: normal high 83°F (28°C), low 64°F (18°C) December: normal high 80°F (27°C), low 59°F (15°C) JFMAMJJASOND

Bars run from the normal low to the normal high for each month.

How rainy is Key Largo?

August has the most wet days (about 19); the year brings about 57 in of precipitation.

January: 7 wet days February: 6 wet days March: 7 wet days April: 6 wet days 6 May: 11 wet days June: 17 wet days July: 17 wet days August: 19 wet days 19 September: 18 wet days October: 13 wet days November: 8 wet days December: 7 wet days JFMAMJJASOND

Wet day: at least 0.01 in of rain or melted snow, counted from daily records 1991-2020.

How humid is Key Largo?

Muggy days peak in August, at about 31 days.

January: 11 muggy days 11 February: 13 muggy days March: 13 muggy days April: 18 muggy days May: 27 muggy days June: 29 muggy days July: 31 muggy days August: 31 muggy days 31 September: 30 muggy days October: 27 muggy days November: 18 muggy days December: 18 muggy days JFMAMJJASOND

Muggy day: daily mean dew point of 65°F or higher, from hourly observations 1991-2020 at Homestead AFB Airport, 28 mi N of the city center (the nearest airport with complete hourly records).

How much daylight?

Daylight ranges from about 10.6 hours in December to 13.7 hours in June.

January: 10.8 hours of daylight February: 11.3 hours of daylight March: 12.0 hours of daylight April: 12.8 hours of daylight May: 13.4 hours of daylight June: 13.7 hours of daylight 13.7 July: 13.5 hours of daylight August: 13.0 hours of daylight September: 12.3 hours of daylight October: 11.6 hours of daylight November: 10.9 hours of daylight December: 10.6 hours of daylight 10.6 JFMAMJJASOND
See all numbers
Monthly climate normals and day counts for Key Largo, 1991-2020
MonthHighLowPrecip.Wet daysMuggy daysDaylight
January 78°F55°F 1.7 in7 11 10.8 h
February 81°F57°F 1.8 in6 13 11.3 h
March 83°F58°F 1.9 in7 13 12.0 h
April 86°F62°F 2.9 in6 18 12.8 h
May 89°F67°F 5.8 in11 27 13.4 h
June 91°F72°F 9.0 in17 29 13.7 h
July 93°F74°F 6.8 in17 31 13.5 h
August 93°F74°F 8.6 in19 31 13.0 h
September 91°F74°F 9.0 in18 30 12.3 h
October 88°F71°F 5.5 in13 27 11.6 h
November 83°F64°F 2.4 in8 18 10.9 h
December 80°F59°F 1.9 in7 18 10.6 h

High and low: NOAA 1991-2020 normal daily high and low. Wet days: at least 0.01 in of rain or melted snow. Muggy days: daily mean dew point 65°F or higher.

Best months to visit Key Largo

By our comfort score, the best months are January, February and March.

Comfort score by month (0-100) and its parts, in days per month
MonthScoreComfortableNotable rainHot or cold
Jan 58931
Feb 57732
Mar 56733
Apr 47148
May 410715
Jun 3501119
Jul 3201025
Aug 2901226
Sep 2901222
Oct 381712
Nov 50442
Dec 55630

Score = 40 × share of comfortable days + 25 × share of days without notable rain + 20 × share of days neither hot (90°F+) nor cold (high 40°F or below) + 15 × daylight. How the score works.

Frost dates in Key Largo

Key Largo is frost-free: NOAA's 1991-2020 normals record no nights at 32°F or below at Tavernier.

Station: Tavernier (USC00088841), NOAA 1991-2020 freeze probabilities. Frost dates for every city in Florida.

Hottest and coldest readings, 1991-2020

The highest reading was 107°F (May 9, 2011); the lowest was 25°F (January 19, 1997).

From the temperature station's daily records with NOAA quality flags removed. Not an all-time record.

Near Key Largo

Similar climates elsewhere

Where the numbers come from

  • Temperature, rain and snow depth: Royal Palm RS (USC00087760), 23 mi NNW of the city center, 7 ft . NOAA normals and daily records, 1991-2020.
  • Snowfall and frost dates: Tavernier (USC00088841), 7.2 mi SW of the city center, 7 ft . NOAA normals and daily records, 1991-2020.
  • Humidity and wind by hour and cloud cover: Homestead AFB (USW00012826), 28 mi N of the city center, 16 ft . NOAA normals and daily records, 1991-2020.
  • Daily humidity and wind: Homestead AFB Airport (722026-12826), 28 mi N of the city center, 5 ft . Hourly observations, 1991-2020.

Distances from the city center (USGS). Methodology · Report an error