Climate and Average Weather Year Round at Guantanamo Bay Naval Base Cuba

The climate at Guantanamo Bay Naval Base is hot, muggy, windy, and partly cloudy. Over the course of the year, the temperature typically varies from 69°F to 92°F and is rarely below 65°F or above 94°F.

Based on the beach/pool score, the best time of year to visit Guantanamo Bay Naval Base for hot-weather activities is from early December to late April.

The temperature at Guantanamo Bay Naval Base varies so little throughout the year that it is not entirely meaningful to discuss hot and cold seasons.

At Guantanamo Bay Naval Base, the average percentage of the sky covered by clouds experiences extreme seasonal variation over the course of the year.

The clearer part of the year at Guantanamo Bay Naval Base begins around November 14 and lasts for 5.8 months, ending around May 8.

The clearest month of the year at Guantanamo Bay Naval Base is February, during which on average the sky is clear, mostly clear, or partly cloudy 84% of the time.

The cloudier part of the year begins around May 8 and lasts for 6.2 months, ending around November 14.

The cloudiest month of the year at Guantanamo Bay Naval Base is June, during which on average the sky is overcast or mostly cloudy 73% of the time.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days at Guantanamo Bay Naval Base varies throughout the year.

The wetter season lasts 6.3 months, from May 4 to November 14, with a greater than 12% chance of a given day being a wet day. The month with the most wet days at Guantanamo Bay Naval Base is October, with an average of 5.8 days with at least 0.04 inches of precipitation.

The drier season lasts 5.7 months, from November 14 to May 4. The month with the fewest wet days at Guantanamo Bay Naval Base is January, with an average of 1.6 days with at least 0.04 inches of precipitation.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. The month with the most days of rain alone at Guantanamo Bay Naval Base is October, with an average of 5.8 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 21% on October 10.

Rainfall

To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Guantanamo Bay Naval Base experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year at Guantanamo Bay Naval Base. The month with the most rain at Guantanamo Bay Naval Base is October, with an average rainfall of 2.5 inches.

The month with the least rain at Guantanamo Bay Naval Base is January, with an average rainfall of 0.4 inches.

The length of the day at Guantanamo Bay Naval Base varies over the course of the year. In 2024, the shortest day is December 21, with 10 hours, 56 minutes of daylight; the longest day is June 20, with 13 hours, 20 minutes of daylight.

The earliest sunrise is at 6:03 AM on November 3, and the latest sunrise is 1 hour, 10 minutes later at 7:12 AM on March 10. The earliest sunset is at 5:19 PM on November 25, and the latest sunset is 2 hours, 24 minutes later at 7:44 PM on July 4.

Daylight saving time (DST) is observed at Guantanamo Bay Naval Base during 2024, starting in the spring on March 10, lasting 7.8 months, and ending in the fall on November 3.

The figure below presents a compact representation of key lunar data for 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.

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.

Guantanamo Bay Naval Base experiences significant seasonal variation in the perceived humidity.

The muggier period of the year lasts for 8.8 months, from March 26 to December 20, during which time the comfort level is muggy, oppressive, or miserable at least 60% of the time. The month with the most muggy days at Guantanamo Bay Naval Base is August, with 30.0 days that are muggy or worse.

The month with the fewest muggy days at Guantanamo Bay Naval Base is February, with 14.1 days that are muggy or worse.

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 at Guantanamo Bay Naval Base experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 6.2 months, from November 1 to May 8, with average wind speeds of more than 10.1 miles per hour. The windiest month of the year at Guantanamo Bay Naval Base is December, with an average hourly wind speed of 11.8 miles per hour.

The calmer time of year lasts for 5.8 months, from May 8 to November 1. The calmest month of the year at Guantanamo Bay Naval Base is September, with an average hourly wind speed of 8.6 miles per hour.

The predominant average hourly wind direction at Guantanamo Bay Naval Base is from the east throughout the year.

Guantanamo Bay Naval Base 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 water temperature experiences some seasonal variation over the course of the year.

The time of year with warmer water lasts for 3.6 months, from July 8 to October 26, with an average temperature above 84°F. The month of the year at Guantanamo Bay Naval Base with the warmest water is September, with an average temperature of 85°F.

The time of year with cooler water lasts for 3.5 months, from December 31 to April 15, with an average temperature below 81°F. The month of the year at Guantanamo Bay Naval Base with the coolest water is February, with an average temperature of 80°F.

To characterize how pleasant the weather is at Guantanamo Bay Naval Base throughout the year, we compute two travel scores.

The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Guantanamo Bay Naval Base for general outdoor tourist activities is from mid December to late March, with a peak score in the last week of January.

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Guantanamo Bay Naval Base for hot-weather activities is from early December to late April, with a peak score in the third week of March.

Methodology

For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.

Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.

Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.

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 at Guantanamo Bay Naval Base 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.

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 experiences some seasonal variation over the course of the year.

The brighter period of the year lasts for 2.0 months, from March 8 to May 6, with an average daily incident shortwave energy per square meter above 6.5 kWh. The brightest month of the year at Guantanamo Bay Naval Base is April, with an average of 7.0 kWh.

The darker period of the year lasts for 6.4 months, from June 29 to January 9, with an average daily incident shortwave energy per square meter below 5.0 kWh. The darkest month of the year at Guantanamo Bay Naval Base is October, with an average of 4.5 kWh.

For the purposes of this report, the geographical coordinates of Guantanamo Bay Naval Base are 19.906 deg latitude, -75.207 deg longitude, and 56 ft elevation.

The topography within 2 miles of Guantanamo Bay Naval Base contains only modest variations in elevation, with a maximum elevation change of 305 feet and an average elevation above sea level of 22 feet. Within 10 miles contains only modest variations in elevation (1,440 feet). Within 50 miles contains very significant variations in elevation (4,081 feet).

The area within 2 miles of Guantanamo Bay Naval Base is covered by water (62%), grassland (14%), and trees (13%), within 10 miles by water (55%) and trees (17%), and within 50 miles by water (55%) and trees (30%).