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Winter Weather in Cook Islands Cook Islands

Daily high temperatures are around 78°F, rarely falling below 73°F or exceeding 82°F. The lowest daily average high temperature is 77°F on August 9.

Daily low temperatures are around 70°F, rarely falling below 64°F or exceeding 75°F. The lowest daily average low temperature is 69°F on August 11.

For reference, on February 19, the hottest day of the year, temperatures in Cook Islands typically range from 77°F to 84°F, while on August 9, the coldest day of the year, they range from 69°F to 77°F.

Average High and Low Temperature in the Winter in Cook Islands

Average High and Low Temperature in the Winter in Cook IslandsJunJulAug62°F62°F64°F64°F66°F66°F68°F68°F70°F70°F72°F72°F74°F74°F76°F76°F78°F78°F80°F80°F82°F82°F84°F84°F86°F86°F88°F88°FFallSpringAug 777°FAug 777°F69°F69°FJun 179°FJun 179°F71°F71°FAug 3177°FAug 3177°F69°F69°FJul 177°FJul 177°F69°F69°F
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 winter temperatures. 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 the Winter in Cook Islands

Average Hourly Temperature in the Winter in Cook IslandsJunJulAug12 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 AMFallSpringcomfortablecomfortablewarm
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.
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The winter in Cook Islands experiences rapidly decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 58% to 45%. The lowest chance of overcast or mostly cloudy conditions is 40% on August 4.

The clearest day of the winter is August 4, with clear, mostly clear, or partly cloudy conditions 60% of the time.

For reference, on January 15, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 76%, while on August 4, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 60%.

Cloud Cover Categories in the Winter in Cook Islands

Cloud Cover Categories in the Winter in Cook IslandsJunJulAug0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%FallSpringJan 1524%Jan 1524%Jun 142%Jun 142%Aug 3155%Aug 3155%Jul 155%Jul 155%Aug 160%Aug 160%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 Cook Islands, the chance of a wet day over the course of the winter is gradually decreasing, starting the season at 23% and ending it at 20%.

For reference, the year's highest daily chance of a wet day is 47% on February 13, and its lowest chance is 16% on June 15.

Probability of Precipitation in the Winter in Cook Islands

Probability of Precipitation in the Winter in Cook IslandsJunJulAug0%0%5%5%10%10%15%15%20%20%25%25%30%30%35%35%40%40%45%45%FallSpringJun 1516%Jun 1516%Jun 123%Jun 123%Aug 3120%Aug 3120%Jul 119%Jul 119%Aug 117%Aug 117%rain
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 season and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during the winter in Cook Islands is rapidly decreasing, starting the season at 3.2 inches, when it rarely exceeds 6.3 inches or falls below 0.5 inches, and ending the season at 2.1 inches, when it rarely exceeds 4.3 inches or falls below 0.5 inches.

The lowest average 31-day accumulation is 2.0 inches on August 11.

Average Monthly Rainfall in the Winter in Cook Islands

Average Monthly Rainfall in the Winter in Cook IslandsJunJulAug0 in0 in2 in2 in4 in4 in6 in6 in8 in8 in10 in10 inFallSpringAug 112.0 inAug 112.0 inJun 13.2 inJun 13.2 inAug 312.1 inAug 312.1 inJul 12.3 inJul 12.3 in
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 the winter in Cook Islands, the length of the day is increasing. From the start to the end of the season, the length of the day increases by 47 minutes, implying an average daily increase of 31 seconds, and weekly increase of 3 minutes, 35 seconds.

The shortest day of the winter is June 20, with 10 hours, 50 minutes of daylight and the longest day is August 31, with 11 hours, 41 minutes of daylight.

Hours of Daylight and Twilight in the Winter in Cook Islands

Hours of Daylight and Twilight in the Winter in Cook IslandsJunJulAug0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrFallSpringJun 2010 hr, 50 minJun 2010 hr, 50 mindaydaydaydaynightAug 3111 hr, 41 minAug 3111 hr, 41 minAug 111 hr, 10 minAug 111 hr, 10 min
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 latest sunrise of the winter in Cook Islands is 7:17 AM on July 5 and the earliest sunrise is 29 minutes earlier at 6:48 AM on August 31.

The earliest sunset is 6:04 PM on June 6 and the latest sunset is 26 minutes later at 6:30 PM on August 31.

Daylight saving time is not observed in Cook Islands during 2024.

For reference, on December 21, the longest day of the year, the Sun rises at 5:54 AM and sets 13 hours, 26 minutes later, at 7:20 PM, while on June 20, the shortest day of the year, it rises at 7:15 AM and sets 10 hours, 50 minutes later, at 6:06 PM.

Sunrise & Sunset with Twilight in the Winter in Cook Islands

Sunrise & Sunset with Twilight in the Winter in Cook IslandsJunJulAug2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMFallSpring6:48 AM6:48 AMAug 316:30 PMAug 316:30 PM7:11 AM7:11 AMJun 66:04 PMJun 66:04 PM7:17 AM7:17 AMJul 56:10 PMJul 56:10 PM7:10 AM7:10 AMAug 16:20 PMAug 16:20 PMSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day in the winter. 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 the Winter in Cook Islands

Solar Elevation and Azimuth in the Winter in Cook IslandsJunJulAug12 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 AMFallSpring0010202030304050001010203030404060
northeastsouthwest
Solar elevation and azimuth in the the winter of 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 the winter of 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 the Winter in Cook Islands

Moon Rise, Set & Phases in the Winter in Cook IslandsJunJulAug12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMFallSpringMay 75:23 PMMay 75:23 PMMay 233:54 AMMay 233:54 AMJun 62:38 AMJun 62:38 AMJun 213:09 PMJun 213:09 PMJul 512:58 PMJul 512:58 PMJul 2112:18 AMJul 2112:18 AMAug 41:14 AMAug 41:14 AMAug 198:26 AMAug 198:26 AMSep 23:56 PMSep 23:56 PMSep 174:35 PMSep 174:35 PM6:36 AM6:36 AM6:01 PM6:01 PM5:33 PM5:33 PM7:21 AM7:21 AM7:34 AM7:34 AM6:25 PM6:25 PM5:59 PM5:59 PM8:10 AM8:10 AM6:11 PM6:11 PM5:51 PM5:51 PM7:47 AM7:47 AM6:54 PM6:54 PM5:43 PM5:43 PM7:09 AM7:09 AM6:45 AM6:45 AM6:32 PM6:32 PM6:35 PM6:35 PM7:01 AM7:01 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.

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 Cook Islands is rapidly decreasing during the winter, falling from 68% to 48% over the course of the season.

The lowest chance of a muggy day during the winter is 46% on August 9.

For reference, on February 2, the muggiest day of the year, there are muggy conditions 99% of the time, while on August 7, the least muggy day of the year, there are muggy conditions 46% of the time.

Humidity Comfort Levels in the Winter in Cook Islands

Humidity Comfort Levels in the Winter in Cook IslandsJunJulAug0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%FallSpringAug 946%Aug 946%Jun 168%Jun 168%Aug 3148%Aug 3148%Jul 151%Jul 151%miserablemiserableoppressiveoppressivemuggymuggyhumidhumidcomfortablecomfortabledrydry
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 Cook Islands is gradually increasing during the winter, increasing from 13.6 miles per hour to 14.1 miles per hour over the course of the season.

For reference, on July 28, the windiest day of the year, the daily average wind speed is 14.5 miles per hour, while on March 13, the calmest day of the year, the daily average wind speed is 12.7 miles per hour.

The highest daily average wind speed during the winter is 14.5 miles per hour on July 28.

Average Wind Speed in the Winter in Cook Islands

Average Wind Speed in the Winter in Cook IslandsJunJulAug0 mph0 mph5 mph5 mph10 mph10 mph15 mph15 mph20 mph20 mphFallSpringJul 2814.5 mphJul 2814.5 mphJun 113.6 mphJun 113.6 mphAug 3114.1 mphAug 3114.1 mphJul 113.9 mphJul 113.9 mph
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 Cook Islands throughout the winter is predominantly from the east, with a peak proportion of 50% on June 7.

Wind Direction in the Winter in Cook Islands

Wind Direction in the Winter in Cook IslandsJunJulAug0%100%20%80%40%60%60%40%80%20%100%0%FallSpringsoutheastnorthwest
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).

Cook Islands 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 Cook Islands is gradually decreasing during the winter, falling by 3°F, from 78°F to 75°F, over the course of the season.

The lowest average surface water temperature during the winter is 75°F on August 18.

Average Water Temperature in the Winter in Cook Islands

Average Water Temperature in the Winter in Cook IslandsJunJulAug73°F73°F74°F74°F75°F75°F76°F76°F77°F77°F78°F78°F79°F79°F80°F80°F81°F81°F82°F82°FFallSpringAug 1875°FAug 1875°FJun 178°FJun 178°FJul 176°FJul 176°FAug 175°FAug 175°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 Cook Islands 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 the Winter in Cook Islands

Time Spent in Various Temperature Bands and the Growing Season in the Winter in Cook IslandsJunJulAug0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%FallSpring100%Jul 17100%Jul 17comfortablewarmcool
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 Cook Islands are very rapidly decreasing during the winter, decreasing by 7,420°F, from 8,777°F to 1,357°F, over the course of the season.

Growing Degree Days in the Winter in Cook Islands

Growing Degree Days in the Winter in Cook IslandsJunJulAug1,000°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°FFallSpringJun 18,777°FJun 18,777°FAug 311,357°FAug 311,357°FJul 11°FJul 11°FAug 1694°FAug 1694°F
The average growing degree days accumulated over the course of the winter, 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 Cook Islands is increasing during the winter, rising by 1.3 kWh, from 3.6 kWh to 4.9 kWh, over the course of the season.

The lowest average daily incident shortwave solar energy during the winter is 3.5 kWh on June 9.

Average Daily Incident Shortwave Solar Energy in the Winter in Cook Islands

Average Daily Incident Shortwave Solar Energy in the Winter in Cook IslandsJunJulAug0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWhFallSpringJun 93.5 kWhJun 93.5 kWhAug 314.9 kWhAug 314.9 kWhJul 13.7 kWhJul 13.7 kWhAug 14.2 kWhAug 14.2 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 Cook Islands are -21.248 deg latitude, -159.785 deg longitude, and 0 ft elevation.

The topography within 2 miles of Cook Islands is essentially flat, with a maximum elevation change of 0 feet and an average elevation above sea level of 0 feet. Within 10 miles is also essentially flat (0 feet). Within 50 miles is also essentially flat (0 feet).

The area within 2 miles of Cook Islands is covered by water (100%), within 10 miles by water (100%), and within 50 miles by water (100%).

This report illustrates the typical weather in Cook Islands, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

The details of the data sources used for this report can be found on the Rarotonga International Airport page.

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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