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Spring Weather in French Guiana French Guiana

Daily high temperatures are around 84°F, rarely falling below 81°F or exceeding 88°F.

Daily low temperatures are around 74°F, rarely falling below 72°F or exceeding 77°F. The highest daily average low temperature is 75°F on April 17.

For reference, on October 1, the hottest day of the year, temperatures in French Guiana typically range from 72°F to 89°F, while on September 10, the coldest day of the year, they range from 72°F to 89°F.

Average High and Low Temperature in the Spring in French Guiana

Average High and Low Temperature in the Spring in French GuianaMarAprMay70°F70°F72°F72°F74°F74°F76°F76°F78°F78°F80°F80°F82°F82°F84°F84°F86°F86°F88°F88°F90°F90°F92°F92°F94°F94°FWinterSummerMar 184°FMar 184°F75°F75°FMay 3185°FMay 3185°F74°F74°FApr 185°FApr 185°F75°F75°FMay 185°FMay 185°F75°F75°FNowNow
The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

The figure below shows you a compact characterization of the hourly average spring 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.

Average Hourly Temperature in the Spring in French Guiana

Average Hourly Temperature in the Spring in French GuianaMarAprMay12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMWinterSummerNowNowcomfortablewarm
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.
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The spring in French Guiana experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 73% throughout the season. The highest chance of overcast or mostly cloudy conditions is 76% on May 6.

The clearest day of the spring is March 24, with clear, mostly clear, or partly cloudy conditions 30% of the time.

For reference, on May 4, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 76%, while on August 13, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 58%.

Cloud Cover Categories in the Spring in French Guiana

Cloud Cover Categories in the Spring in French GuianaMarAprMay0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%WinterSummerAug 1358%Aug 1358%Mar 129%Mar 129%May 3129%May 3129%Apr 129%Apr 129%May 124%May 124%NowNowmostly clearpartly cloudymostly cloudyovercastclear
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In French Guiana, the chance of a wet day over the course of the spring is very rapidly increasing, starting the season at 64% and ending it at 93%.

For reference, the year's highest daily chance of a wet day is 93% on May 31, and its lowest chance is 23% on September 25.

Probability of Precipitation in the Spring in French Guiana

Probability of Precipitation in the Spring in French GuianaMarAprMay0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%WinterSummerMay 2893%May 2893%Mar 2561%Mar 2561%Mar 164%Mar 164%May 182%May 182%NowNowrain
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

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 spring in French Guiana is very rapidly increasing, starting the season at 9.8 inches, when it rarely exceeds 16.7 inches or falls below 3.7 inches, and ending the season at 15.9 inches, when it rarely exceeds 22.3 inches or falls below 9.5 inches.

The highest average 31-day accumulation is 17.4 inches on May 16.

Average Monthly Rainfall in the Spring in French Guiana

Average Monthly Rainfall in the Spring in French GuianaMarAprMay0 in0 in5 in5 in10 in10 in15 in15 in20 in20 in25 in25 inWinterSummerMay 1517.4 inMay 1517.4 inMar 19.8 inMar 19.8 inMay 3115.9 inMay 3115.9 inApr 111.2 inApr 111.2 inMay 116.1 inMay 116.1 inNowNow
The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average snowfall.

Over the course of the spring in French Guiana, the length of the day is gradually increasing. From the start to the end of the season, the length of the day increases by 18 minutes, implying an average daily increase of 12 seconds, and weekly increase of 1 minute, 22 seconds.

The shortest day of the spring is March 1, with 12 hours, 3 minutes of daylight and the longest day is May 31, with 12 hours, 20 minutes of daylight.

Hours of Daylight and Twilight in the Spring in French Guiana

Hours of Daylight and Twilight in the Spring in French GuianaMarAprMay0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrWinterSummerMar 2012 hr, 6 minMar 2012 hr, 6 minnightnightdaydayMay 3112 hr, 20 minMay 3112 hr, 20 minMay 112 hr, 16 minMay 112 hr, 16 minNowNow
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The latest sunrise of the spring in French Guiana is 6:42 AM on March 1 and the earliest sunrise is 24 minutes earlier at 6:19 AM on May 21.

The latest sunset is 6:45 PM on March 1 and the earliest sunset is 9 minutes earlier at 6:36 PM on May 2.

Daylight saving time is not observed in French Guiana during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 6:23 AM and sets 12 hours, 21 minutes later, at 6:44 PM, while on December 21, the shortest day of the year, it rises at 6:33 AM and sets 11 hours, 54 minutes later, at 6:27 PM.

Sunrise & Sunset with Twilight in the Spring in French Guiana

Sunrise & Sunset with Twilight in the Spring in French GuianaMarAprMay2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMWinterSummer6:19 AM6:19 AMMay 216:38 PMMay 216:38 PM6:42 AM6:42 AMMar 16:45 PMMar 16:45 PM6:21 AM6:21 AMMay 26:36 PMMay 26:36 PM6:31 AM6:31 AMApr 16:40 PMApr 16:40 PMSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
The solar day in the spring. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.

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.

Solar Elevation and Azimuth in the Spring in French Guiana

Solar Elevation and Azimuth in the Spring in French GuianaMarAprMay12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMWinterSummer001020203030405050606070800010102030304040506060707080NowNow
northeastsouthwest
Solar elevation and azimuth in the the spring of 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

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

Moon Rise, Set & Phases in the Spring in French Guiana

Moon Rise, Set & Phases in the Spring in French GuianaMarAprMay12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMWinterSummerFeb 98:00 PMFeb 98:00 PMFeb 249:31 AMFeb 249:31 AMMar 106:01 AMMar 106:01 AMMar 254:01 AMMar 254:01 AMApr 83:22 PMApr 83:22 PMApr 238:50 PMApr 238:50 PMMay 812:23 AMMay 812:23 AMMay 2310:54 AMMay 2310:54 AMJun 69:38 AMJun 69:38 AMJun 2110:09 PMJun 2110:09 PM6:26 AM6:26 AM6:43 PM6:43 PM6:20 PM6:20 PM6:49 AM6:49 AM6:48 AM6:48 AM7:12 PM7:12 PM6:23 PM6:23 PM6:43 AM6:43 AM6:12 AM6:12 AM6:42 PM6:42 PM6:27 PM6:27 PM6:40 AM6:40 AM6:16 PM6:16 PM5:57 PM5:57 PM6:08 AM6:08 AM6:59 PM6:59 PM6:34 PM6:34 PM6:46 AM6:46 AM
The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.

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 French Guiana is essentially constant during the spring, remaining around 100% throughout.

For reference, on January 1, the muggiest day of the year, there are muggy conditions 100% of the time, while on March 14, the least muggy day of the year, there are muggy conditions 100% of the time.

Humidity Comfort Levels in the Spring in French Guiana

Humidity Comfort Levels in the Spring in French GuianaMarAprMay0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%WinterSummerMar 19100%Mar 19100%Mar 1100%Mar 1100%May 31100%May 31100%Apr 1100%Apr 1100%May 1100%May 1100%NowNowmiserablemiserableoppressiveoppressivemuggymuggy
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.

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 French Guiana is decreasing during the spring, decreasing from 7.3 miles per hour to 5.6 miles per hour over the course of the season.

For reference, on February 18, the windiest day of the year, the daily average wind speed is 7.4 miles per hour, while on July 14, the calmest day of the year, the daily average wind speed is 4.8 miles per hour.

Average Wind Speed in the Spring in French Guiana

Average Wind Speed in the Spring in French GuianaMarAprMay0 mph0 mph1 mph1 mph2 mph2 mph3 mph3 mph4 mph4 mph5 mph5 mph6 mph6 mph7 mph7 mph8 mph8 mphWinterSummerMar 17.3 mphMar 17.3 mphMay 315.6 mphMay 315.6 mphApr 17.0 mphApr 17.0 mphMay 16.5 mphMay 16.5 mphNowNow
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The hourly average wind direction in French Guiana throughout the spring is predominantly from the east, with a peak proportion of 96% on May 19.

Wind Direction in the Spring in French Guiana

Wind Direction in the Spring in French GuianaMarAprMay0%100%20%80%40%60%60%40%80%20%100%0%WinterSummerNowNoweast
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

French Guiana 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 French Guiana is essentially constant during the spring, remaining within 1°F of 81°F throughout.

Average Water Temperature in the Spring in French Guiana

Average Water Temperature in the Spring in French GuianaMarAprMay79°F79°F80°F80°F81°F81°F82°F82°F83°F83°F84°F84°FWinterSummerMar 180°FMar 180°FMay 3182°FMay 3182°FApr 181°FApr 181°FMay 181°FMay 181°FNowNow
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

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 French Guiana 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.

Time Spent in Various Temperature Bands and the Growing Season in the Spring in French Guiana

Time Spent in Various Temperature Bands and the Growing Season in the Spring in French GuianaMarAprMay0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%WinterSummer100%Apr 16100%Apr 16NowNowcomfortablewarmhot
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing season.

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 French Guiana are very rapidly increasing during the spring, increasing by 2,625°F, from 1,691°F to 4,316°F, over the course of the season.

Growing Degree Days in the Spring in French Guiana

Growing Degree Days in the Spring in French GuianaMarAprMay2,000°F2,000°F2,500°F2,500°F3,000°F3,000°F3,500°F3,500°F4,000°F4,000°FWinterSummerMar 11,691°FMar 11,691°FMay 314,316°FMay 314,316°FApr 12,578°FApr 12,578°FMay 13,454°FMay 13,454°FNowNow
The average growing degree days accumulated over the course of the spring, with 25th to 75th and 10th to 90th percentile bands.

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 French Guiana is decreasing during the spring, falling by 1.1 kWh, from 5.7 kWh to 4.6 kWh, over the course of the season.

The highest average daily incident shortwave solar energy during the spring is 5.9 kWh on March 25. The lowest average daily incident shortwave solar energy during the spring is 4.6 kWh on May 31.

Average Daily Incident Shortwave Solar Energy in the Spring in French Guiana

Average Daily Incident Shortwave Solar Energy in the Spring in French GuianaMarAprMay0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWhWinterSummerMar 255.9 kWhMar 255.9 kWhMay 314.6 kWhMay 314.6 kWhMar 15.7 kWhMar 15.7 kWhMay 15.3 kWhMay 15.3 kWhNowNow
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

For the purposes of this report, the geographical coordinates of French Guiana are 4.000 deg latitude, -53.000 deg longitude, and 0 ft elevation.

The topography within 2 miles of French Guiana is essentially flat, with a maximum elevation change of 0 feet and an average elevation above sea level of 0 feet. Within 10 miles is also essentially flat (0 feet). Within 50 miles is also essentially flat (0 feet).

The area within 2 miles of French Guiana is covered by trees (100%), within 10 miles by trees (99%), and within 50 miles by trees (97%).

This report illustrates the typical weather in French Guiana, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

The details of the data sources used for this report can be found on the Cayenne-Rochambeau page.

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