Spring Weather in Grand-Santi French Guiana

Daily high temperatures are around 85°F, rarely falling below 82°F or exceeding 91°F.

Daily low temperatures are around 74°F, rarely falling below 70°F or exceeding 76°F. The highest daily average low temperature is 74°F on May 6.

For reference, on October 10, the hottest day of the year, temperatures in Grand-Santi typically range from 73°F to 89°F, while on February 3, the coldest day of the year, they range from 72°F to 85°F.

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.

Padang, Indonesia (10,690 miles away); Manismata, Indonesia (11,436 miles); and Bitung, Indonesia (12,053 miles) are the far-away foreign places with temperatures most similar to Grand-Santi (view comparison).

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The spring in Grand-Santi 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 77% on May 4.

The clearest day of the spring is May 31, with clear, mostly clear, or partly cloudy conditions 31% of the time.

For reference, on May 4, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 77%, while on August 14, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 57%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Grand-Santi, the chance of a wet day over the course of the spring is very rapidly increasing, starting the season at 62% and ending it at 90%.

For reference, the year's highest daily chance of a wet day is 90% on May 19, and its lowest chance is 27% on September 20.

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 Grand-Santi is very rapidly increasing, starting the season at 7.3 inches, when it rarely exceeds 12.2 inches or falls below 2.9 inches, and ending the season at 12.0 inches, when it rarely exceeds 16.0 inches or falls below 7.9 inches.

The highest average 31-day accumulation is 12.6 inches on May 18. The lowest average 31-day accumulation is 7.3 inches on March 2.

Over the course of the spring in Grand-Santi, the length of the day is gradually increasing. From the start to the end of the season, the length of the day increases by 19 minutes, implying an average daily increase of 12 seconds, and weekly increase of 1 minute, 27 seconds.

The shortest day of the spring is March 1, with 12 hours, 2 minutes of daylight and the longest day is May 31, with 12 hours, 21 minutes of daylight.

The latest sunrise of the spring in Grand-Santi is 6:48 AM on March 1 and the earliest sunrise is 24 minutes earlier at 6:24 AM on May 21.

The latest sunset is 6:50 PM on March 1 and the earliest sunset is 8 minutes earlier at 6:42 PM on May 3.

Daylight saving time is not observed in Grand-Santi during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 6:28 AM and sets 12 hours, 22 minutes later, at 6:50 PM, while on December 21, the shortest day of the year, it rises at 6:39 AM and sets 11 hours, 53 minutes later, at 6:32 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 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.

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 Grand-Santi is essentially constant during the spring, remaining around 100% throughout.

For reference, on January 2, the muggiest day of the year, there are muggy conditions 100% of the time, while on October 9, the least muggy day of the year, there are muggy conditions 99% 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 Grand-Santi is essentially constant during the spring, remaining within 0.2 miles per hour of 2.0 miles per hour throughout.

For reference, on February 19, the windiest day of the year, the daily average wind speed is 2.2 miles per hour, while on June 8, the calmest day of the year, the daily average wind speed is 1.7 miles per hour.

The wind direction in Grand-Santi during the spring is predominantly out of the north from March 1 to March 22 and the east from March 22 to May 31.

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 Grand-Santi 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 Grand-Santi are very rapidly increasing during the spring, increasing by 2,589°F, from 1,644°F to 4,234°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 Grand-Santi is gradually decreasing during the spring, falling by 0.8 kWh, from 6.0 kWh to 5.2 kWh, over the course of the season.

The highest average daily incident shortwave solar energy during the spring is 6.1 kWh on March 16. The lowest average daily incident shortwave solar energy during the spring is 5.1 kWh on May 29.

For the purposes of this report, the geographical coordinates of Grand-Santi are 4.273 deg latitude, -54.381 deg longitude, and 171 ft elevation.

The topography within 2 miles of Grand-Santi contains only modest variations in elevation, with a maximum elevation change of 236 feet and an average elevation above sea level of 233 feet. Within 10 miles contains only modest variations in elevation (1,444 feet). Within 50 miles contains very significant variations in elevation (2,434 feet).

The area within 2 miles of Grand-Santi is covered by trees (80%) and water (15%), within 10 miles by trees (93%), and within 50 miles by trees (94%).