1. WeatherSpark.com
  2. Trinidad & Tobago
  3. Diego Martin
  4. Petit Valley

Fall Weather in Petit Valley Trinidad & Tobago

Daily high temperatures are around 86°F, rarely falling below 82°F or exceeding 90°F. The highest daily average high temperature is 87°F on September 12.

Daily low temperatures are around 75°F, rarely falling below 72°F or exceeding 77°F. The highest daily average low temperature is 75°F on September 24.

For reference, on September 12, the hottest day of the year, temperatures in Petit Valley typically range from 75°F to 87°F, while on January 21, the coldest day of the year, they range from 72°F to 84°F.

Average High and Low Temperature in the Fall in Petit Valley

Average High and Low Temperature in the Fall in Petit ValleySepOctNov70°F70°F75°F75°F80°F80°F85°F85°F90°F90°F95°F95°FSummerWinterSep 1287°FSep 1287°F75°F75°FNov 3085°FNov 3085°F74°F74°FOct 187°FOct 187°F75°F75°FNov 186°FNov 186°F75°F75°F
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 fall 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 Fall in Petit Valley

Average Hourly Temperature in the Fall in Petit ValleySepOctNov12 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 AMSummerWintercomfortablewarmhot
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.

Siusega, Samoa (7,749 miles away); Arue, French Polynesia (6,315 miles); and Ubud, Indonesia (12,185 miles) are the far-away foreign places with temperatures most similar to Petit Valley (view comparison).

Map
Marker
© OpenStreetMap contributors

Compare Petit Valley to another city:

Map

The fall in Petit Valley experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 67% to 71%. The highest chance of overcast or mostly cloudy conditions is 73% on October 13.

The clearest day of the fall is September 1, with clear, mostly clear, or partly cloudy conditions 34% of the time.

For reference, on April 18, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 73%, while on July 11, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 40%.

Cloud Cover Categories in the Fall in Petit Valley

Cloud Cover Categories in the Fall in Petit ValleySepOctNov0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%SummerWinterJul 1140%Jul 1140%Sep 134%Sep 134%Nov 3029%Nov 3029%Oct 129%Oct 129%Nov 129%Nov 129%clearmostly clearpartly cloudymostly cloudyovercast
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 Petit Valley, the chance of a wet day over the course of the fall is essentially constant, remaining around 41% throughout.

For reference, the year's highest daily chance of a wet day is 51% on July 2, and its lowest chance is 6% on March 20.

Probability of Precipitation in the Fall in Petit Valley

Probability of Precipitation in the Fall in Petit ValleySepOctNov0%0%5%5%10%10%15%15%20%20%25%25%30%30%35%35%40%40%45%45%50%50%55%55%SummerWinterSep 141%Sep 141%Nov 3041%Nov 3041%Oct 139%Oct 139%Nov 140%Nov 140%rain
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 fall in Petit Valley is gradually increasing, starting the season at 3.7 inches, when it rarely exceeds 5.9 inches or falls below 1.7 inches, and ending the season at 4.2 inches, when it rarely exceeds 7.7 inches or falls below 1.4 inches.

The highest average 31-day accumulation is 4.6 inches on November 16.

Average Monthly Rainfall in the Fall in Petit Valley

Average Monthly Rainfall in the Fall in Petit ValleySepOctNov0 in0 in2 in2 in4 in4 in6 in6 in8 in8 inSummerWinterNov 154.6 inNov 154.6 inSep 13.7 inSep 13.7 inNov 304.2 inNov 304.2 inOct 13.6 inOct 13.6 inNov 14.2 inNov 14.2 in
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 fall in Petit Valley, the length of the day is decreasing. From the start to the end of the season, the length of the day decreases by 46 minutes, implying an average daily decrease of 31 seconds, and weekly decrease of 3 minutes, 34 seconds.

The shortest day of the fall is November 30, with 11 hours, 33 minutes of daylight and the longest day is September 1, with 12 hours, 19 minutes of daylight.

Hours of Daylight and Twilight in the Fall in Petit Valley

Hours of Daylight and Twilight in the Fall in Petit ValleySepOctNov0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrSummerWinterSep 2212 hr, 7 minSep 2212 hr, 7 minnightnightdaydayNov 3011 hr, 33 minNov 3011 hr, 33 minNov 111 hr, 44 minNov 111 hr, 44 min
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 earliest sunrise of the fall in Petit Valley is 5:54 AM on October 6 and the latest sunrise is 14 minutes later at 6:08 AM on November 30.

The latest sunset is 6:15 PM on September 1 and the earliest sunset is 36 minutes earlier at 5:39 PM on November 16.

Daylight saving time is not observed in Petit Valley during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 5:45 AM and sets 12 hours, 45 minutes later, at 6:30 PM, while on December 21, the shortest day of the year, it rises at 6:19 AM and sets 11 hours, 30 minutes later, at 5:49 PM.

Sunrise & Sunset with Twilight in the Fall in Petit Valley

Sunrise & Sunset with Twilight in the Fall in Petit ValleySepOctNov12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMSummerWinter5:54 AM5:54 AMOct 65:53 PMOct 65:53 PM5:56 AM5:56 AMSep 16:15 PMSep 16:15 PM6:02 AM6:02 AMNov 165:39 PMNov 165:39 PMSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day in the fall. 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 Fall in Petit Valley

Solar Elevation and Azimuth in the Fall in Petit ValleySepOctNov12 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 AMSummerWinter001020203030405050606070800010102030304040506070
northeastsouthwest
Solar elevation and azimuth in the the fall 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 fall 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 Fall in Petit Valley

Moon Rise, Set & Phases in the Fall in Petit ValleySepOctNov12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMSummerWinterAug 47:14 AMAug 47:14 AMAug 192:26 PMAug 192:26 PMSep 29:56 PMSep 29:56 PMSep 1710:35 PMSep 1710:35 PMOct 22:50 PMOct 22:50 PMOct 177:27 AMOct 177:27 AMNov 18:48 AMNov 18:48 AMNov 155:29 PMNov 155:29 PMDec 12:22 AMDec 12:22 AMDec 155:02 AMDec 155:02 AMDec 306:28 PMDec 306:28 PM6:54 PM6:54 PM6:34 PM6:34 PM6:40 AM6:40 AM6:10 PM6:10 PM5:55 PM5:55 PM6:17 AM6:17 AM5:55 PM5:55 PM5:13 PM5:13 PM5:53 AM5:53 AM5:53 AM5:53 AM5:46 PM5:46 PM5:28 PM5:28 PM6:38 AM6:38 AM6:22 AM6:22 AM5:07 PM5:07 PM6:27 AM6:27 AM6:05 AM6:05 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 Petit Valley is essentially constant during the fall, remaining around 100% throughout.

For reference, on May 11, the muggiest day of the year, there are muggy conditions 100% of the time, while on February 25, the least muggy day of the year, there are muggy conditions 99% of the time.

Humidity Comfort Levels in the Fall in Petit Valley

Humidity Comfort Levels in the Fall in Petit ValleySepOctNov0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%SummerWinterSep 1100%Sep 1100%Nov 30100%Nov 30100%Oct 1100%Oct 1100%Nov 1100%Nov 1100%miserablemiserableoppressiveoppressivemuggymuggy
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 Petit Valley is rapidly increasing during the fall, increasing from 11.9 miles per hour to 14.4 miles per hour over the course of the season.

For reference, on February 21, the windiest day of the year, the daily average wind speed is 16.8 miles per hour, while on September 4, the calmest day of the year, the daily average wind speed is 11.9 miles per hour.

The lowest daily average wind speed during the fall is 11.9 miles per hour on September 4.

Average Wind Speed in the Fall in Petit Valley

Average Wind Speed in the Fall in Petit ValleySepOctNov0 mph0 mph5 mph5 mph10 mph10 mph15 mph15 mphSummerWinterSep 411.9 mphSep 411.9 mphNov 3014.4 mphNov 3014.4 mphOct 112.0 mphOct 112.0 mphNov 112.8 mphNov 112.8 mph
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 Petit Valley throughout the fall is predominantly from the east, with a peak proportion of 98% on November 9.

Wind Direction in the Fall in Petit Valley

Wind Direction in the Fall in Petit ValleySepOctNov0%100%20%80%40%60%60%40%80%20%100%0%SummerWintereast
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).

Petit Valley 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 Petit Valley is gradually decreasing during the fall, falling by 2°F, from 84°F to 82°F, over the course of the season.

The highest average surface water temperature during the fall is 84°F on September 12.

Average Water Temperature in the Fall in Petit Valley

Average Water Temperature in the Fall in Petit ValleySepOctNov79°F79°F80°F80°F81°F81°F82°F82°F83°F83°F84°F84°F85°F85°F86°F86°FSummerWinterSep 1284°FSep 1284°FNov 3082°FNov 3082°FOct 184°FOct 184°FNov 183°FNov 183°F
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 Petit Valley 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 Fall in Petit Valley

Time Spent in Various Temperature Bands and the Growing Season in the Fall in Petit ValleySepOctNov0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%SummerWinter100%Oct 16100%Oct 16comfortablewarmhot
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 Petit Valley are very rapidly increasing during the fall, increasing by 2,653°F, from 6,988°F to 9,641°F, over the course of the season.

Growing Degree Days in the Fall in Petit Valley

Growing Degree Days in the Fall in Petit ValleySepOctNov7,000°F7,000°F7,500°F7,500°F8,000°F8,000°F8,500°F8,500°F9,000°F9,000°F9,500°F9,500°FSummerWinterSep 16,988°FSep 16,988°FNov 309,641°FNov 309,641°FOct 17,884°FOct 17,884°FNov 18,806°FNov 18,806°F
The average growing degree days accumulated over the course of the fall, 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 Petit Valley is essentially constant during the fall, remaining within 0.3 kWh of 4.9 kWh throughout.

The lowest average daily incident shortwave solar energy during the fall is 4.6 kWh on October 13.

Average Daily Incident Shortwave Solar Energy in the Fall in Petit Valley

Average Daily Incident Shortwave Solar Energy in the Fall in Petit ValleySepOctNov0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWhSummerWinterOct 134.6 kWhOct 134.6 kWhSep 15.2 kWhSep 15.2 kWhNov 305.0 kWhNov 305.0 kWhNov 14.6 kWhNov 14.6 kWh
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 Petit Valley are 10.700 deg latitude, -61.533 deg longitude, and 981 ft elevation.

The topography within 2 miles of Petit Valley contains very significant variations in elevation, with a maximum elevation change of 1,759 feet and an average elevation above sea level of 530 feet. Within 10 miles contains very significant variations in elevation (3,081 feet). Within 50 miles contains large variations in elevation (3,510 feet).

The area within 2 miles of Petit Valley is covered by grassland (35%), trees (33%), and cropland (11%), within 10 miles by water (66%) and trees (19%), and within 50 miles by water (81%) and trees (13%).

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

Temperature and Dew Point

There are 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Petit Valley.

For each station, the records are corrected for the elevation difference between that station and Petit Valley according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

The estimated value at Petit Valley is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Petit Valley and a given station.

The stations contributing to this reconstruction are:

To get a sense of how much these sources agree with each other, you can view a comparison of Petit Valley and the stations that contribute to our estimates of its temperature history and climate. Please note that each source's contribution is adjusted for elevation and the relative change present in the MERRA-2 data.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.

Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.

Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for airports and weather stations are provided by AskGeo.com .

Maps are © OpenStreetMap contributors.

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.

Please review our full terms contained on our Terms of Service page.