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January Weather in Vaini Tonga

Daily high temperatures are around 84°F, rarely falling below 81°F or exceeding 87°F.

Daily low temperatures are around 75°F, rarely falling below 70°F or exceeding 78°F.

For reference, on February 13, the hottest day of the year, temperatures in Vaini typically range from 76°F to 85°F, while on August 22, the coldest day of the year, they range from 66°F to 76°F.

Average High and Low Temperature in January in Vaini

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 temperatures for the quarter of the year centered on January. 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 January in Vaini

Average Hourly Temperature in January in VainiJan112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 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 AMDecFebcomfortablewarm
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.

Morcellemont Saint André, Mauritius (7,883 miles away) is the far-away foreign place with temperatures most similar to Vaini (view comparison).

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The month of January in Vaini experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 68% throughout the month.

The clearest day of the month is January 8, with clear, mostly clear, or partly cloudy conditions 33% of the time.

For reference, on February 25, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 71%, while on August 8, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 62%.

Cloud Cover Categories in January in Vaini

Cloud Cover Categories in January in VainiJan11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%DecFebJan 133%Jan 133%Jan 3131%Jan 3131%Jan 1133%Jan 1133%Jan 2131%Jan 2131%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 Vaini, the chance of a wet day over the course of January is very rapidly increasing, starting the month at 28% and ending it at 37%.

For reference, the year's highest daily chance of a wet day is 42% on April 2, and its lowest chance is 15% on June 29.

Probability of Precipitation in January in Vaini

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 month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during January in Vaini is rapidly increasing, starting the month at 4.4 inches, when it rarely exceeds 9.5 inches or falls below 0.5 inches, and ending the month at 5.8 inches, when it rarely exceeds 11.3 inches or falls below 1.1 inches.

Average Monthly Rainfall in January in Vaini

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 January in Vaini, the length of the day is gradually decreasing. From the start to the end of the month, the length of the day decreases by 21 minutes, implying an average daily decrease of 41 seconds, and weekly decrease of 4 minutes, 50 seconds.

The shortest day of the month is January 31, with 13 hours, 3 minutes of daylight and the longest day is January 1, with 13 hours, 24 minutes of daylight.

Hours of Daylight and Twilight in January in Vaini

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 month in Vaini is 6:02 AM on January 1 and the latest sunrise is 20 minutes later at 6:22 AM on January 31.

The latest sunset is 7:28 PM on January 15 and the earliest sunset is 2 minutes, 49 seconds earlier at 7:25 PM on January 31.

Daylight saving time is not observed in Vaini during 2024.

For reference, on December 21, the longest day of the year, the Sun rises at 5:56 AM and sets 13 hours, 26 minutes later, at 7:22 PM, while on June 20, the shortest day of the year, it rises at 7:17 AM and sets 10 hours, 51 minutes later, at 6:07 PM.

Sunrise & Sunset with Twilight in January in Vaini

Sunrise & Sunset with Twilight in January in VainiJan11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031312 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMDecFeb6:02 AM6:02 AMJan 17:26 PMJan 17:26 PM6:11 AM6:11 AMJan 157:28 PMJan 157:28 PM6:22 AM6:22 AMJan 317:25 PMJan 317:25 PMSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of January. 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 January in Vaini

Solar Elevation and Azimuth in January in VainiJan112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 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 AMDecFeb
northeastsouthwest
Solar elevation and azimuth over the course of January 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 January 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 January in Vaini

Moon Rise, Set & Phases in January in VainiJan112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMDecFebDec 1312:33 PMDec 1312:33 PMDec 271:34 PMDec 271:34 PMJan 1212:58 AMJan 1212:58 AMJan 266:55 AMJan 266:55 AMFeb 1012:00 PMFeb 1012:00 PMFeb 251:31 AMFeb 251:31 AM5:31 AM5:31 AM7:37 PM7:37 PM7:43 PM7:43 PM6:33 AM6:33 AM6:21 AM6:21 AM8:20 PM8:20 PM7:16 PM7:16 PM6:17 AM6:17 AM6:14 AM6:14 AM7:45 PM7:45 PM7:10 PM7:10 PM6:49 AM6:49 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.
Jan 2024IlluminationMoonriseMoonsetMoonriseMeridian PassingDistance
1
81%-10:10 AMWNW11:09 PME4:24 AMN251,242 mi
2
73%-11:00 AMW11:40 PME5:04 AMN251,600 mi
3
64%-11:48 AMW-5:43 AMN251,179 mi
4
50%12:10 AME12:36 PMW-6:22 AMN249,931 mi
5
44%12:40 AME1:26 PMW-7:02 AMN247,870 mi
6
34%1:12 AMESE2:18 PMWSW-7:43 AMN245,082 mi
7
25%1:48 AMESE3:14 PMWSW-8:29 AMN241,725 mi
8
16%2:29 AMESE4:14 PMWSW-9:19 AMS238,033 mi
9
9%3:16 AMESE5:17 PMWSW-10:15 AMS234,299 mi
10
3%4:11 AMESE6:21 PMWSW-11:15 AMS230,856 mi
11
0%5:13 AMESE7:23 PMWSW-12:19 PMS228,031 mi
12
0%6:21 AMESE8:20 PMWSW-1:23 PMS226,087 mi
13
3%7:30 AMESE9:10 PMWSW-2:23 PMN225,173 mi
14
9%8:37 AMESE9:55 PMWSW-3:19 PMN225,299 mi
15
18%9:42 AMESE10:35 PMW-4:10 PMN226,353 mi
16
28%10:43 AME11:13 PMW-4:59 PMN228,139 mi
17
39%11:42 AME11:50 PMW-5:47 PMN230,424 mi
18
50%12:41 PME--6:34 PMN232,984 mi
19
62%-12:27 AMWNW1:40 PMENE7:23 PMN235,632 mi
20
73%-1:07 AMWNW2:40 PMENE8:14 PMN238,237 mi
21
82%-1:50 AMWNW3:40 PMENE9:08 PMN240,715 mi
22
89%-2:38 AMWNW4:39 PMENE10:04 PMN243,027 mi
23
95%-3:29 AMWNW5:36 PMENE11:00 PMN245,153 mi
24
98%-4:24 AMWNW6:29 PMENE11:55 PMN247,081 mi
25
99%-5:21 AMWNW7:16 PMENE--
26
100%-6:17 AMWNW7:58 PMENE12:47 AMN248,784 mi
27
99%-7:12 AMWNW8:35 PMENE1:35 AMN250,219 mi
28
97%-8:04 AMWNW9:09 PMENE2:20 AMN251,314 mi
29
93%-8:54 AMW9:40 PME3:01 AMN251,980 mi
30
87%-9:42 AMW10:10 PME3:41 AMN252,118 mi
31
80%-10:30 AMW10:40 PME4:19 AMN251,630 mi

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 Vaini is gradually increasing during January, rising from 97% to 99% over the course of the month.

For reference, on February 13, the muggiest day of the year, there are muggy conditions 100% of the time, while on August 23, the least muggy day of the year, there are muggy conditions 36% of the time.

Humidity Comfort Levels in January in Vaini

Humidity Comfort Levels in January in VainiJan11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%DecFebJan 197%Jan 197%Jan 3199%Jan 3199%Jan 1198%Jan 1198%Jan 2199%Jan 2199%miserablemiserableoppressiveoppressivemuggymuggyhumidhumid
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 Vaini is gradually decreasing during January, decreasing from 14.4 miles per hour to 13.7 miles per hour over the course of the month.

For reference, on April 25, the windiest day of the year, the daily average wind speed is 15.4 miles per hour, while on February 17, the calmest day of the year, the daily average wind speed is 13.5 miles per hour.

Average Wind Speed in January in Vaini

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 Vaini throughout January is predominantly from the east, with a peak proportion of 68% on January 7.

Wind Direction in January in Vaini

Wind Direction in January in VainiJan11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%20%80%40%60%60%40%80%20%100%0%DecFebeastnorthsouthwest
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).

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 surface water temperature in Vaini is essentially constant during January, remaining within 1°F of 80°F throughout.

Average Water Temperature in January in Vaini

Average Water Temperature in January in VainiJan112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313176°F76°F77°F77°F78°F78°F79°F79°F80°F80°F81°F81°F82°F82°F83°F83°F84°F84°FDecFebJan 180°FJan 180°FJan 3181°FJan 3181°FJan 1180°FJan 1180°FJan 2181°FJan 2181°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 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 in January in Vaini

Time Spent in Various Temperature Bands and the Growing Season in January in VainiJan11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%DecFeb100%Jan 16100%Jan 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 Vaini are rapidly increasing during January, increasing by 871°F, from 4,316°F to 5,188°F, over the course of the month.

Growing Degree Days in January in Vaini

Growing Degree Days in January in VainiJan11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031314,200°F4,200°F4,400°F4,400°F4,600°F4,600°F4,800°F4,800°F5,000°F5,000°F5,200°F5,200°F5,400°F5,400°FDecFebJan 14,316°FJan 14,316°FJan 315,188°FJan 315,188°FJan 114,604°FJan 114,604°FJan 214,892°FJan 214,892°F
The average growing degree days accumulated over the course of January, 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 Vaini is essentially constant during January, remaining within 0.2 kWh of 6.5 kWh throughout.

Average Daily Incident Shortwave Solar Energy in January in Vaini

Average Daily Incident Shortwave Solar Energy in January in VainiJan11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhDecFebJan 16.6 kWhJan 16.6 kWhJan 316.3 kWhJan 316.3 kWhJan 116.6 kWhJan 116.6 kWhJan 216.4 kWhJan 216.4 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 Vaini are -21.193 deg latitude, -175.177 deg longitude, and 30 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.

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.

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