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Climate and Average Weather Year Round in Koumac New Caledonia

In Koumac, the summers are warm, oppressive, wet, and mostly cloudy; the winters are short, comfortable, and mostly clear; and it is windy year round. Over the course of the year, the temperature typically varies from 62°F to 86°F and is rarely below 58°F or above 89°F.

Based on the tourism score, the best time of year to visit Koumac for warm-weather activities is from early July to early December.

Climate in Koumac

hotwarmwarmJanFebMarAprMayJunJulAugSepOctNovDecNowNow78%78%37%37%clearovercastprecipitation: 6.6 inprecipitation: 6.6 in0.9 in0.9 inmuggy: 99%muggy: 99%9%9%tourism score: 8.3tourism score: 8.35.45.4
Koumac weather by month. Click on each chart for more information.

The hot season lasts for 3.5 months, from December 10 to March 27, with an average daily high temperature above 83°F. The hottest month of the year in Koumac is February, with an average high of 86°F and low of 75°F.

The cool season lasts for 2.9 months, from June 14 to September 11, with an average daily high temperature below 77°F. The coldest month of the year in Koumac is July, with an average low of 63°F and high of 75°F.

Average High and Low Temperature in Koumac

Average High and Low Temperature in KoumachothotcoolJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FAug 375°FAug 375°FFeb 486°FFeb 486°F62°F62°F75°F75°FDec 1083°FDec 1083°FMar 2783°FMar 2783°FJun 1477°FJun 1477°FSep 1177°FSep 1177°F72°F72°F73°F73°F65°F65°F64°F64°FNowNow
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.
AverageJanFebMarAprMayJunJulAugSepOctNovDec
High 85°F86°F84°F82°F79°F77°F75°F75°F77°F80°F82°F84°F
Temp. 80°F80°F79°F76°F73°F70°F68°F69°F70°F73°F76°F78°F
Low 74°F75°F74°F71°F68°F65°F63°F63°F64°F67°F70°F72°F

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 Koumac

Average Hourly Temperature in KoumacJanFebMarAprMayJunJulAugSepOctNovDec12 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 AMNowNowcoolcomfortablewarmwarmwarmcomfortable
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.

Mahanoro, Madagascar (7,264 miles away) is the far-away foreign place with temperatures most similar to Koumac (view comparison).

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In Koumac, 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 Koumac begins around June 7 and lasts for 6.0 months, ending around December 7.

The clearest month of the year in Koumac is September, during which on average the sky is clear, mostly clear, or partly cloudy 77% of the time.

The cloudier part of the year begins around December 7 and lasts for 6.0 months, ending around June 7.

The cloudiest month of the year in Koumac is February, during which on average the sky is overcast or mostly cloudy 62% of the time.

Cloud Cover Categories in Koumac

Cloud Cover Categories in KoumacclearercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Sep 1178%Sep 1178%Feb 2937%Feb 2937%Jun 758%Jun 758%Dec 758%Dec 758%NowNowclearmostly clearpartly cloudyovercastmostly cloudy
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.
FractionJanFebMarAprMayJunJulAugSepOctNovDec
Cloudier 58%62%56%45%43%40%31%25%23%29%37%46%
Clearer 42%38%44%55%57%60%69%75%77%71%63%54%

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

The wetter season lasts 3.8 months, from December 23 to April 16, with a greater than 25% chance of a given day being a wet day. The month with the most wet days in Koumac is February, with an average of 11.6 days with at least 0.04 inches of precipitation.

The drier season lasts 8.2 months, from April 16 to December 23. The month with the fewest wet days in Koumac is September, with an average of 3.1 days with at least 0.04 inches of precipitation.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. The month with the most days of rain alone in Koumac is February, with an average of 11.6 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 41% on February 28.

Daily Chance of Precipitation in Koumac

Daily Chance of Precipitation in KoumacwetdryJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Feb 2841%Feb 2841%Aug 289%Aug 289%Dec 2325%Dec 2325%Apr 1625%Apr 1625%NowNowrain
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).
Days ofJanFebMarAprMayJunJulAugSepOctNovDec
Rain 10.4d11.6d11.7d7.6d6.6d5.7d4.2d3.4d3.1d3.6d5.1d7.2d

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. Koumac experiences extreme seasonal variation in monthly rainfall.

Rain falls throughout the year in Koumac. The month with the most rain in Koumac is February, with an average rainfall of 6.2 inches.

The month with the least rain in Koumac is September, with an average rainfall of 0.9 inches.

Average Monthly Rainfall in Koumac

Average Monthly Rainfall in KoumacJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in2 in2 in4 in4 in6 in6 in8 in8 in10 in10 in12 in12 in14 in14 inMar 46.6 inMar 46.6 inOct 20.9 inOct 20.9 inNowNow
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.
JanFebMarAprMayJunJulAugSepOctNovDec
Rainfall 5.0″6.2″5.9″3.4″2.8″2.6″1.8″1.3″0.9″1.0″1.9″3.3″

The length of the day in Koumac varies over the course of the year. In 2024, the shortest day is June 21, with 10 hours, 53 minutes of daylight; the longest day is December 21, with 13 hours, 23 minutes of daylight.

Hours of Daylight and Twilight in Koumac

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.
Hours ofJanFebMarAprMayJunJulAugSepOctNovDec
Daylight 13.2h12.8h12.2h11.6h11.1h10.9h11.0h11.4h12.0h12.6h13.1h13.4h

The earliest sunrise is at 5:13 AM on November 27, and the latest sunrise is 1 hour, 27 minutes later at 6:39 AM on July 5. The earliest sunset is at 5:29 PM on June 5, and the latest sunset is 1 hour, 20 minutes later at 6:49 PM on January 17.

Daylight saving time (DST) is not observed in Koumac during 2024.

Sunrise & Sunset with Twilight in Koumac

Sunrise & Sunset with Twilight in KoumacJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMNov 275:13 AMNov 275:13 AM6:49 PMJan 176:49 PMJan 17Jun 55:29 PMJun 55:29 PM6:39 AMJul 56:39 AMJul 5daySolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
The solar day over the course of the year 2024. 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 Koumac

Solar Elevation and Azimuth in KoumacJanFebMarAprMayJunJulAugSepOctNovDec12 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 AM00001010101020202020303030304040404050505060607070800000101010102020202030303030404040405050506060607070804690NowNow
northeastsouthwest
Solar elevation and azimuth over the course of the year 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 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.

Moon Rise, Set & Phases in Koumac

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.

Koumac experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 7.9 months, from October 12 to June 8, during which time the comfort level is muggy, oppressive, or miserable at least 32% of the time. The month with the most muggy days in Koumac is March, with 29.8 days that are muggy or worse.

The month with the fewest muggy days in Koumac is August, with 3.4 days that are muggy or worse.

Humidity Comfort Levels in Koumac

Humidity Comfort Levels in KoumacmuggymuggyJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Aug 29%Aug 29%99%Feb 1899%Feb 18Oct 1232%Oct 1232%Jun 832%Jun 832%NowNowmiserablemiserableoppressiveoppressivemuggymuggyhumidhumidcomfortablecomfortabledrydry
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.
JanFebMarAprMayJunJulAugSepOctNovDec
Muggy days 29.6d28.6d29.8d24.6d16.2d8.4d3.9d3.4d5.5d10.9d18.4d26.8d

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 Koumac experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 6.2 months, from February 24 to August 30, with average wind speeds of more than 12.0 miles per hour. The windiest month of the year in Koumac is May, with an average hourly wind speed of 12.8 miles per hour.

The calmer time of year lasts for 5.9 months, from August 30 to February 24. The calmest month of the year in Koumac is December, with an average hourly wind speed of 11.3 miles per hour.

Average Wind Speed in Koumac

Average Wind Speed in KoumacwindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mph14 mph14 mph16 mph16 mph18 mph18 mphMar 2313.0 mphMar 2313.0 mphDec 1511.1 mphDec 1511.1 mphAug 3012.0 mphAug 3012.0 mphNowNow
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.
JanFebMarAprMayJunJulAugSepOctNovDec
Wind Speed (mph) 11.511.712.812.812.812.712.712.511.611.511.511.3

The predominant average hourly wind direction in Koumac is from the east throughout the year.

Wind Direction in Koumac

Wind Direction in KoumacJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%NowNowsoutheastnorthwest
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).

Koumac 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 3.4 months, from December 29 to April 11, with an average temperature above 81°F. The month of the year in Koumac with the warmest water is February, with an average temperature of 82°F.

The time of year with cooler water lasts for 3.5 months, from June 28 to October 10, with an average temperature below 76°F. The month of the year in Koumac with the coolest water is August, with an average temperature of 74°F.

Average Water Temperature in Koumac

Average Water Temperature in KoumacwarmcoolJanFebMarAprMayJunJulAugSepOctNovDec72°F72°F74°F74°F76°F76°F78°F78°F80°F80°F82°F82°F84°F84°FFeb 2182°FFeb 2182°F74°FAug 1474°FAug 14Dec 2981°FDec 2981°FApr 1181°FApr 1181°FJun 2876°FJun 2876°FOct 1076°FOct 1076°FNowNow
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.
WaterJanFebMarAprMayJunJulAugSepOctNovDec
Temperature 81°F82°F82°F80°F78°F76°F75°F74°F74°F76°F78°F80°F

To characterize how pleasant the weather is in Koumac 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 Koumac for general outdoor tourist activities is from early July to early December, with a peak score in the last week of September.

Tourism Score in Koumac

Tourism Score in Koumacbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810108.38.35.45.47.47.4NowNowtemperaturetemperature cloudscloudsprecipitationprecipitationtourism score
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

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 Koumac for hot-weather activities are from mid March to late April and from early November to late January, with a peak score in the second week of December.

Beach/Pool Score in Koumac

Beach/Pool Score in Koumacbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810106.86.82.02.06.56.55.85.8NowNowtemperaturetemperature cloudscloudsprecipitationprecipitationbeach/pool score
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

Methodology

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.

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 Koumac 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 Koumac

Time Spent in Various Temperature Bands and the Growing Season in KoumacJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%100%Jan 1100%Jan 1100%Jul 2100%Jul 2NowNowcoolcomfortablewarmhot
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.

Growing Degree Days in Koumac

Growing Degree Days in KoumacJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F1,000°F1,000°F2,000°F2,000°F3,000°F3,000°F4,000°F4,000°F5,000°F5,000°F6,000°F6,000°F7,000°F7,000°F8,000°F8,000°F9,000°F9,000°FJul 690°FJul 690°FAug 19900°FAug 19900°FOct 31,800°FOct 31,800°FJun 308,863°FJun 308,863°FNowNow
The average growing degree days accumulated over the course of the year, 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 experiences significant seasonal variation over the course of the year.

The brighter period of the year lasts for 3.9 months, from September 30 to January 28, with an average daily incident shortwave energy per square meter above 6.8 kWh. The brightest month of the year in Koumac is November, with an average of 7.4 kWh.

The darker period of the year lasts for 2.9 months, from May 5 to August 1, with an average daily incident shortwave energy per square meter below 4.7 kWh. The darkest month of the year in Koumac is June, with an average of 4.0 kWh.

Average Daily Incident Shortwave Solar Energy in Koumac

Average Daily Incident Shortwave Solar Energy in KoumacbrightbrightdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhDec 37.5 kWhDec 37.5 kWhJun 133.9 kWhJun 133.9 kWhSep 306.8 kWhSep 306.8 kWhJan 286.8 kWhJan 286.8 kWhMay 54.7 kWhMay 54.7 kWhAug 14.7 kWhAug 14.7 kWhNowNow
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.
JanFebMarAprMayJunJulAugSepOctNovDec
Solar Energy (kWh) 7.06.45.95.24.44.04.35.16.37.17.47.4

For the purposes of this report, the geographical coordinates of Koumac are -20.567 deg latitude, 164.283 deg longitude, and 3 ft elevation.

The topography within 2 miles of Koumac contains only modest variations in elevation, with a maximum elevation change of 308 feet and an average elevation above sea level of 42 feet. Within 10 miles contains only modest variations in elevation (3,507 feet). Within 50 miles also contains extreme variations in elevation (5,341 feet).

The area within 2 miles of Koumac is covered by water (53%), trees (20%), and cropland (17%), within 10 miles by water (60%) and trees (26%), and within 50 miles by water (85%) and trees (11%).

This report illustrates the typical weather in Koumac, 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, Koumac Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of Koumac.

At a distance of 4 kilometers from Koumac, 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 Koumac 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.

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