Average Weather in Vaini Tonga
In Vaini, the summers are warm, oppressive, and overcast; the winters are comfortable, humid, and partly cloudy; and it is wet and windy year round. Over the course of the year, the temperature typically varies from 66°F to 85°F and is rarely below 60°F or above 88°F.
Based on the tourism score, the best time of year to visit Vaini for warm-weather activities is from mid May to early November.
The hot season lasts for 3.5 months, from December 22 to April 6, with an average daily high temperature above 83°F. The hottest day of the year is February 13, with an average high of 85°F and low of 76°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 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 Vaini, 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 Vaini 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 62% of the time, and overcast or mostly cloudy 38% of the time.
The cloudier part of the year begins around October 30 and lasts for 6.2 months, ending around May 5. On February 25, the cloudiest day of the year, the sky is overcast or mostly cloudy 71% of the time, and clear, mostly clear, or partly cloudy 29% of the time.
Cloud Cover Categories
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Vaini varies throughout the year.
The wetter season lasts 4.7 months, from December 5 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 5. 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
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. Vaini experiences extreme seasonal variation in monthly rainfall.
Rain falls throughout the year in Vaini. 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 an average total accumulation of 1.9 inches.
Average Monthly Rainfall
The length of the day in Vaini varies over the course of the year. In 2018, the shortest day is June 21, with 10 hours, 51 minutes of daylight; the longest day is December 22, with 13 hours, 26 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:56 AM on November 2, and the latest sunrise is 1 hour, 22 minutes later at 7:18 AM on July 5. The earliest sunset is at 6:06 PM on June 6, and the latest sunset is 2 hours, 22 minutes later at 8:28 PM on January 15.
Daylight saving time (DST) is observed in Vaini during 2018, starting in the spring on November 4 and ending in the fall on January 21.
Sunrise & Sunset with Twilight and Daylight Saving Time
Vaini experiences extreme seasonal variation in the perceived humidity.
The muggier period of the year lasts for 8.5 months, from October 7 to June 24, during which time the comfort level is muggy, oppressive, or miserable at least 52% 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 36% of the time.
Humidity Comfort Levels
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Vaini experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 2.6 months, from April 3 to June 22, with average wind speeds of more than 14.4 miles per hour. The windiest day of the year is April 26, with an average hourly wind speed of 15.4 miles per hour.
The calmer time of year lasts for 9.4 months, from June 22 to April 3. The calmest day of the year is February 17, with an average hourly wind speed of 13.5 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Vaini is from the east throughout the year.
Vaini 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 3.5 months, from January 6 to April 21, 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 3.4 months, from July 8 to October 20, with an average temperature below 76°F. The day of the year with the coolest water is August 26, with an average temperature of 74°F.
Average Water Temperature
Best Time of Year to Visit
To characterize how pleasant the weather is in Vaini 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 Vaini for general outdoor tourist activities is from mid May to early November, with a peak score in the last week of July.
The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best times of year to visit Vaini for hot-weather activities are from mid March to early June and from mid October to early February, with a peak score in the first week of May.
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 Vaini 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 significant seasonal variation over the course of the year.
The brighter period of the year lasts for 4.0 months, from October 11 to February 10, 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 2.9 months, from May 8 to August 6, 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
For the purposes of this report, the geographical coordinates of Vaini are -21.193 deg latitude, -175.177 deg longitude, and 46 ft elevation.
The topography within 2 miles of Vaini contains only modest variations in elevation, with a maximum elevation change of 131 feet and an average elevation above sea level of 47 feet. Within 10 miles also contains only modest variations in elevation (253 feet). Within 50 miles contains only modest variations in elevation (1,030 feet).
The area within 2 miles of Vaini is covered by trees (44%), water (29%), shrubs (14%), and grassland (13%), within 10 miles by water (85%), and within 50 miles by water (99%).
This report illustrates the typical weather in Vaini, 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 is only a single weather station, Fuaʻamotu International Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of Vaini.
At a distance of 5 kilometers from Vaini, closer than our threshold of 150 kilometers, this station is deemed sufficiently nearby to be relied upon as our primary source for temperature and dew point records.
The station records are corrected for the elevation difference between the station and Vaini according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
Please note that the station records themselves may additionally have been back-filled using other nearby stations or the MERRA-2 reanalysis.
Time zones for aiports and weather stations are provided by AskGeo.com .