Key Largo, FL climate
Key Largo has warm winters and warm summers, with plenty of rain. A typical July afternoon reaches 89°, a January night drops to 62°, and snow is almost unheard of.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Key Largo feels like
Winter
Spring
Summer
Fall
Key Largo weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 75° | 62° | 2.0" | 0 | 6 | 0 | 63° – 74° |
| February | 77° | 64° | 2.0" | 0 | 4 | 0 | 64° – 76° |
| March | 79° | 66° | 2.0" | 0 | 5 | 0 | 67° – 78° |
| April | 82° | 70° | 2.7" | 0 | 5 | 0 | 73° – 81° |
| May | 85° | 74° | 4.3" | 0 | 6 | 0 | 76° – 82° |
| June | 87° | 77° | 7.3" | 0 | 11 | 0 | 80° – 85° |
| July | 89° | 78° | 5.0" | 0 | 9 | 0 | 82° – 85° |
| August | 89° | 78° | 6.8" | 0 | 12 | 0 | 82° – 85° |
| September | 88° | 77° | 8.6" | 0 | 13 | 0 | 81° – 84° |
| October | 85° | 75° | 6.0" | 0 | 12 | 0 | 78° – 83° |
| November | 81° | 70° | 2.9" | 0 | 6 | 0 | 71° – 80° |
| December | 77° | 65° | 1.9" | 0 | 6 | 0 | 62° – 79° |
| Year | 83° | 71° | 51.6" | 0.0" | 96 | 0 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in Key Largo
Key Largo gets 52 inches of rain and melted snow a year. September is the wettest month and December the driest. Rain or snow falls on about 96 days a year.
A year-round growing season
Heating and cooling a home in Key Largo
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Key Largo, 2% of that work is heating and 98% is cooling, so air conditioning is the bigger bill.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
Key Largo and its neighbors
Key Largo borders 2 towns with climate data. January nights across them vary by 2.1°. North Key Largo has the coldest January nights (62°) and Tavernier the hottest July afternoons (89°). Key Largo’s January low is 62° and its July high 89°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Key Largo compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in Key Largo averaged 2.0° warmer than the 1900s. The biggest change is in December (+2.8°). The shift is larger than in 94% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Key Largo’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. December swings the most: between 1991 and 2020 its average temperature ranged from 62° to 79°. September is the most reliable, staying within 3°.
Common questions about Key Largo’s climate
What is the coldest month in Key Largo?
January, with a typical high of 75° and a low of 62°.
What is the hottest month in Key Largo?
August, with a typical high of 89° and a low of 78°. About 47 days a year reach 90°.
How much snow does Key Largo get?
Almost none. A normal year brings 0.0 inches.
When is the first frost in Key Largo?
Frost is uncommon. Only 0% of years see a night at 32° or below.
What is the rainiest month in Key Largo?
September, with 8.6 inches of rain and melted snow. The year totals 52 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Key Largo itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Tavernier, FL (10 mi, snow) and John Pennekamp Sp, FL (6 mi, frost, heat and degree days). Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.