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Average Weather at Fuaʻamotu International Airport Tonga

At Fuaʻamotu International Airport, the temperature typically varies from 66°F to 85°F over the course of the year, and is rarely below 60°F or above 88°F.

The warm season lasts for 3.5 months, from December 22 to April 7, with an average daily high temperature above 83°F. The hottest day of the year is February 15, with an average high of 85°F and low of 75°F.

The cool season lasts for 3.6 months, from June 12 to September 30, with an average daily high temperature below 78°F. The coldest day of the year is August 23, with an average low of 66°F and high of 76°F.

Average High and Low Temperature

The daily average high (red line) and low (blue line) temperature with percentile bands, 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 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

12 AM4 AM8 AM12 PM4 PM8 PM12 AMJanFebMarAprMayJunJulAugSepOctNovDeccomfortablecomfortablewarmwarm
The average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < chilly < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The shaded overlays indicate night and civil twilight.

Sun

The length of the day at Fuaʻamotu International Airport varies over the course of the year. In 2017, the shortest day is June 21, with 10 hours, 50 minutes of daylight; the longest day is December 21, with 13 hours, 26 minutes of daylight.

Hours of Daylight and Twilight

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 is at 5:56 AM on November 3, and the latest sunrise is 1 hour, 23 minutes later at 7:18 AM on July 5. The earliest sunset is at 6:05 PM on June 5, and the latest sunset is 2 hours, 23 minutes later at 8:28 PM on January 13.

Daylight saving time (DST) is observed at Fuaʻamotu International Airport during 2017, starting in the spring on November 5 and ending in the fall on January 15.

Sunrise & Sunset with Twilight and Daylight Saving Time

The solar day over the course of the year 2017. 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 transitions to and from daylight saving time are indicated by the 'DST' labels.

Clouds

At Fuaʻamotu International Airport, 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 at Fuaʻamotu International Airport begins around May 5 and lasts for 5.8 months, ending around October 30. On August 9, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 63% of the time, and overcast or mostly cloudy 37% of the time.

The cloudier part of the year begins around October 30 and lasts for 6.2 months, ending around May 5. On March 1, the cloudiest day of the year, the sky is overcast or mostly cloudy 70% of the time, and clear, mostly clear, or partly cloudy 29% of the time.

Cloud Cover

clearerclearercloudiercloudiercloudiercloudier0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecMar 170%Mar 170%Aug 937%Aug 937%May 554%May 554%Oct 3054%Oct 3054%overcastovercastmostly cloudymostly cloudymostly clearmostly clearclearclear
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.

Precipitation

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days at Fuaʻamotu International Airport varies throughout the year.

The wetter season lasts 4.7 months, from December 7 to April 28, with a greater than 29% chance of a given day being a wet day. The chance of a wet day peaks at 42% on April 3.

The drier season lasts 7.3 months, from April 28 to December 7. The smallest chance of a wet day is 15% on June 30.

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 42% on April 3.

Daily Chance of Precipitation

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 months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day in the year. Fuaʻamotu International Airport experiences very significant seasonal variation in monthly rainfall.

Rain falls throughout the year at Fuaʻamotu International Airport. The most rain falls during the 31 days centered around February 21, with an average total accumulation of 6.4 inches.

The least rain falls around July 10, with and average total accumulation of 1.9 inches.

Average Monthly Rainfall

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 liquid-equivalent snowfall.

Humidity

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.

Fuaʻamotu International Airport experiences very significant seasonal variation in the perceived humidity.

The muggier period of the year lasts for 8.5 months, from October 8 to June 23, during which time the comfort level is muggy, oppressive, or miserable at least 51% of the time. The muggiest day of the year is February 14, with muggy conditions 100% of the time.

The least muggy day of the year is August 24, with muggy conditions 35% of the time.

Humidity Comfort Levels

muggymuggymuggymuggy0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecAug 2435%Aug 2435%100%Feb 14100%Feb 14Oct 852%Oct 852%Jun 2351%Jun 2351%miserablemiserableoppressiveoppressivemuggymuggyhumidhumidcomfortablecomfortabledrydry
The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.

Wind

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 Fuaʻamotu International Airport experiences mildly seasonal variation over the course of the year.

The windier part of the year lasts for 2.7 months, from April 2 to June 22, with average wind speeds of more than 7.8 miles per hour. The windiest day of the year is April 27, with an average hourly wind speed of 8.3 miles per hour.

The calmer time of year lasts for 9.3 months, from June 22 to April 2. The calmest day of the year is February 17, with an average hourly wind speed of 7.3 miles per hour.

Average Wind Speed

windywindy0 mph1 mph2 mph3 mph4 mph5 mph6 mph7 mph8 mph9 mph10 mph11 mph12 mphJanFebMarAprMayJunJulAugSepOctNovDecApr 278.3 mphApr 278.3 mphFeb 177.3 mphFeb 177.3 mphJun 227.8 mphJun 227.8 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The predominant average hourly wind direction at Fuaʻamotu International Airport is from the east throughout the year.

Wind Direction

0%20%40%60%80%100%JanFebMarAprMayJunJulAugSepOctNovDecwestwestsouthsoutheasteastnorthnorth
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Water Temperature

Fuaʻamotu International Airport 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 January 5 to April 22, with an average temperature above 80°F. The day of the year with the warmest water is February 26, with an average temperature of 82°F.

The time of year with cooler water lasts for 3.5 months, from July 7 to October 21, with an average temperature below 76°F. The day of the year with the coolest water is August 27, with an average temperature of 74°F.

Average Water Temperature

The daily average water temperature (purple line) with percentile bands, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

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 significant seasonal variation over the course of the year.

The brighter period of the year lasts for 4.0 months, from October 10 to February 11, with an average daily incident shortwave energy per square meter above 6.1 kWh. The brightest day of the year is December 17, with an average of 6.7 kWh.

The darker period of the year lasts for 3.0 months, from May 8 to August 7, with an average daily incident shortwave energy per square meter below 4.2 kWh. The darkest day of the year is June 15, with an average of 3.6 kWh.

Average Daily Incident Shortwave Solar Energy

The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

For the purposes of this report, the geographical coordinates of Fuaʻamotu International Airport are -21.241 deg latitude, -175.150 deg longitude, and 95 ft elevation (map ).

The topography within 2 miles of Fuaʻamotu International Airport contains only modest variations in elevation, with a maximum elevation change of 230 feet, and an average elevation above sea level of 120 feet. Within 10 miles also contains only modest variations in elevation (253 feet). Within 50 miles contains very significant variations in elevation (1,030 feet).

The area within 2 miles of Fuaʻamotu International Airport is covered by trees (44%), water (22%), grassland (18%), and shrubs (16%), within 10 miles by water (88%), and within 50 miles by water (99%).

Data Sources

This report illustrates the typical weather at Fuaʻamotu International Airport, 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

Fuaʻamotu International Airport has a weather station that reported reliably enough during the analysis period that we have included it in our network. When available, historical temperature and dew point measurements are taken directly from this weather station. These records are obtained from NOAA's Integrated Surface Hourly data set, falling back on ICAO METAR records as required.

There are no other weather stations in our network within 200 kilometers of this location. Consequently, in the case of missing or erroneous measurements from this station, we fall back on NASA's MERRA-2 modern-era reanalysis , adjusted according to typical seasonal and diurnal differences between this station and the wide-area MERRA-2 reconstructed values.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , 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 aiports and weather stations are provided by AskGeo.com .