Average Weather in Vailoatai American Samoa
The climate in Vailoatai is hot, oppressive, windy, and overcast. Over the course of the year, the temperature typically varies from 77°F to 88°F and is rarely below 74°F or above 90°F.
Based on the beach/pool score, the best time of year to visit Vailoatai for hot-weather activities is from mid June to late September.
The temperature in Vailoatai varies so little throughout the year that it is not entirely meaningful to discuss hot and cold seasons.
Average High and Low Temperature
The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, 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 Vailoatai, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.
The clearer part of the year in Vailoatai begins around May 11 and lasts for 5.1 months, ending around October 15. On August 25, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 61% of the time, and overcast or mostly cloudy 39% of the time.
The cloudier part of the year begins around October 15 and lasts for 6.9 months, ending around May 11. On January 7, the cloudiest day of the year, the sky is overcast or mostly cloudy 88% of the time, and clear, mostly clear, or partly cloudy 12% of the time.
Cloud Cover Categories
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Vailoatai varies significantly throughout the year.
The wetter season lasts 7.4 months, from October 13 to May 26, with a greater than 40% chance of a given day being a wet day. The chance of a wet day peaks at 62% on January 16.
The drier season lasts 4.6 months, from May 26 to October 13. The smallest chance of a wet day is 17% on July 29.
Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 62% on January 16.
Daily Chance of Precipitation
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. Vailoatai experiences extreme seasonal variation in monthly rainfall.
Rain falls throughout the year in Vailoatai. The most rain falls during the 31 days centered around January 21, with an average total accumulation of 10.2 inches.
The least rain falls around August 4, with an average total accumulation of 1.5 inches.
Average Monthly Rainfall
The length of the day in Vailoatai varies over the course of the year. In 2018, the shortest day is June 20, with 11 hours, 17 minutes of daylight; the longest day is December 21, with 12 hours, 59 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:43 AM on November 21, and the latest sunrise is 1 hour, 5 minutes later at 6:48 AM on July 9. The earliest sunset is at 6:00 PM on May 31, and the latest sunset is 58 minutes later at 6:59 PM on January 21.
Daylight saving time (DST) is not observed in Vailoatai during 2018.
Sunrise & Sunset with Twilight
The perceived humidity level in Vailoatai, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, staying within 1% of 99% throughout.
Humidity Comfort Levels
The average hourly wind speed in Vailoatai experiences significant seasonal variation over the course of the year.
The windier part of the year lasts for 5.3 months, from May 19 to October 30, with average wind speeds of more than 12.7 miles per hour. The windiest day of the year is July 29, with an average hourly wind speed of 15.0 miles per hour.
The calmer time of year lasts for 6.7 months, from October 30 to May 19. The calmest day of the year is March 9, with an average hourly wind speed of 10.4 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Vailoatai is from the east throughout the year.
Vailoatai 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 does not vary significantly over the course of the year, remaining within 2°F of 83°F throughout.
Average Water Temperature
Best Time of Year to Visit
To characterize how pleasant the weather is in Vailoatai 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 Vailoatai for general outdoor tourist activities is from late June to mid September, with a peak score in the second week of August.
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 Vailoatai for hot-weather activities is from mid June to late September, with a peak score in the third week of August.
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.
Temperatures in Vailoatai 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
Growing Degree Days
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 2.2 months, from August 31 to November 6, with an average daily incident shortwave energy per square meter above 5.6 kWh. The brightest day of the year is September 21, with an average of 5.9 kWh.
The darker period of the year lasts for 3.0 months, from April 15 to July 14, with an average daily incident shortwave energy per square meter below 4.6 kWh. The darkest day of the year is May 29, with an average of 4.2 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Vailoatai are -14.361 deg latitude, -170.782 deg longitude, and 0 ft elevation.
The topography within 2 miles of Vailoatai contains significant variations in elevation, with a maximum elevation change of 561 feet and an average elevation above sea level of 57 feet. Within 10 miles contains significant variations in elevation (1,932 feet). Within 50 miles also contains very significant variations in elevation (1,932 feet).
The area within 2 miles of Vailoatai is covered by water (78%) and trees (18%), within 10 miles by water (92%), and within 50 miles by water (100%).
This report illustrates the typical weather in Vailoatai, 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 Vailoatai.
For each station, the records are corrected for the elevation difference between that station and Vailoatai 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 Vailoatai is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Vailoatai and a given station.
Time zones for aiports and weather stations are provided by AskGeo.com .