Winter Weather in North Key Largo United States

Daily high temperatures are around 77°F, rarely falling below 68°F or exceeding 83°F. The lowest daily average high temperature is 75°F on January 18.

Daily low temperatures are around 65°F, rarely falling below 50°F or exceeding 75°F. The lowest daily average low temperature is 62°F on January 18.

For reference, on August 7, the hottest day of the year, temperatures in North Key Largo typically range from 78°F to 89°F, while on January 18, the coldest day of the year, they range from 62°F to 75°F.

The figure below shows you a compact characterization of the hourly average winter temperatures. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Taitung City, Taiwan (8,830 miles away) is the far-away foreign place with temperatures most similar to North Key Largo (view comparison).

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The winter in North Key Largo experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 33% to 29%.

The clearest day of the winter is February 24, with clear, mostly clear, or partly cloudy conditions 72% of the time.

For reference, on September 15, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 69%, while on March 6, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 72%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In North Key Largo, the chance of a wet day over the course of the winter is essentially constant, remaining around 15% throughout.

For reference, the year's highest daily chance of a wet day is 64% on August 31, and its lowest chance is 13% on December 16.

Rainfall

To show variation within the season and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during the winter in North Key Largo is essentially constant, remaining about 1.3 inches throughout, and rarely exceeding 3.9 inches or falling below 0.1 inches.

The lowest average 31-day accumulation is 1.2 inches on December 22.

Over the course of the winter in North Key Largo, the length of the day is increasing. From the start to the end of the season, the length of the day increases by 58 minutes, implying an average daily increase of 39 seconds, and weekly increase of 4 minutes, 32 seconds.

The shortest day of the winter is December 20, with 10 hours, 34 minutes of daylight and the longest day is February 28, with 11 hours, 38 minutes of daylight.

The latest sunrise of the winter in North Key Largo is 7:08 AM on January 13 and the earliest sunrise is 24 minutes earlier at 6:44 AM on February 28.

The earliest sunset is 5:30 PM on December 1 and the latest sunset is 52 minutes later at 6:22 PM on February 28.

Daylight saving time is observed in North Key Largo during 2024, but it neither starts nor ends during the winter, so the entire season is in daylight saving time.

For reference, on June 20, the longest day of the year, the Sun rises at 6:31 AM and sets 13 hours, 43 minutes later, at 8:14 PM, while on December 21, the shortest day of the year, it rises at 7:02 AM and sets 10 hours, 34 minutes later, at 5:36 PM.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

The figure below presents a compact representation of key lunar data for the winter of 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

The chance that a given day will be muggy in North Key Largo is rapidly decreasing during the winter, falling from 56% to 42% over the course of the season.

The lowest chance of a muggy day during the winter is 36% on January 30.

For reference, on August 1, the muggiest day of the year, there are muggy conditions 100% of the time, while on January 30, the least muggy day of the year, there are muggy conditions 36% of the time.

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed in North Key Largo is essentially constant during the winter, remaining within 0.2 miles per hour of 12.9 miles per hour throughout.

For reference, on November 10, the windiest day of the year, the daily average wind speed is 13.6 miles per hour, while on August 8, the calmest day of the year, the daily average wind speed is 8.7 miles per hour.

The lowest daily average wind speed during the winter is 12.7 miles per hour on February 14.

The hourly average wind direction in North Key Largo throughout the winter is predominantly from the east, with a peak proportion of 53% on December 1.

North Key Largo is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average surface water temperature in North Key Largo is gradually decreasing during the winter, falling by 3°F, from 78°F to 76°F, over the course of the season.

The lowest average surface water temperature during the winter is 75°F on February 7.

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

Temperatures in North Key Largo are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

The average accumulated growing degree days in North Key Largo are very rapidly decreasing during the winter, decreasing by 7,879°F, from 8,971°F to 1,093°F, over the course of the season.

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy in North Key Largo is rapidly increasing during the winter, rising by 1.6 kWh, from 3.9 kWh to 5.5 kWh, over the course of the season.

The lowest average daily incident shortwave solar energy during the winter is 3.8 kWh on December 22.

For the purposes of this report, the geographical coordinates of North Key Largo are 25.267 deg latitude, -80.323 deg longitude, and 3 ft elevation.

The topography within 2 miles of North Key Largo is essentially flat, with a maximum elevation change of 7 feet and an average elevation above sea level of 2 feet. Within 10 miles is also essentially flat (10 feet). Within 50 miles is also essentially flat (82 feet).

The area within 2 miles of North Key Largo is covered by mangroves (44%), water (37%), and herbaceous vegetation (18%), within 10 miles by water (67%) and herbaceous vegetation (18%), and within 50 miles by water (68%) and herbaceous vegetation (17%).