Climate comparison

Cook Islands

United States

Cook Islands
All information: Cook Islands
United States of America
All information: United States
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Cook IslandsUnited States
Climate zoneTropicsSubpolar zone to Tropics
Latitudes21° 12' S64° 51' N to 19° 30' N
Distance to equator2,400 km2,200 - 7,200 km
Annual valuesCook IslandsUnited States
Ø Daytime maximum temperature27.70 °C18.80 °C
Ø Daily low temperature21.90 °C7.2 °C
Ø Water temperature26 °C17.70 °C
Ø Humidity80 %67 %
Precipitation1,799 mm938 mm
Rain days136.8 days85.2 days
Hours of sunshine2,300 hrs.2,628 hrs.

Colors of the following climate diagrams:
Cook Islands
United States

Daily maximum temperatures

The highest daytime temperatures on the Cook Islands are reached in March with an average of 29.7 °C. The coldest month, on the other hand, is August, with an average of just 25.5 °C. In the United States, July is the warmest month, with 30.8 °C. There, it is coolest in January with an average of 6.0 °C.

Night time lows

At night, it cools down to varying degrees depending on the country and altitude. On the Cook Islands, temperatures drop as low as 19.7 °C in August. The warmest nights are in January at 24.0 °C. In the United States, it is coolest at night in January at -4.2 °C and warmest in July at 18.8 °C. This corresponds to a cooling of 5.4 to 6.3 °C on the Cook Islands and 9.8 to 12.5 °C in the United States.

Water temperatures


The humidity of the air depends to a large extent on the air temperature. The warmer the air, the more water it can absorb. At a temperature of 25°C it is 23 grams per cubic meter, at 30 degrees it is already 26 grams. Therefore, the air humidity is given as a relative value to the temperature-dependent maximum amount. It becomes unpleasant when high humidity is combined with high temperatures.


Humidex is an approximate, sensed temperature calculated on the basis of air temperature, dew point and humidity. It was developed in 1965 by the Canadian meteorologists J. M. Masterton and F. A. Richardson. Since the wind speed is ignored here, it is not very meaningful in areas below approx. 15°C. Above that, it is more reliable, since at higher temperatures humidity plays a greater role than wind.

Rain days per month

By definition, a rain day is a day on which at least 0.1 liters of precipitation per m² fall. This corresponds to a 1 square meter puddle in which the water stands 0.1 mm high — insofar as the water does not seep away or evaporate. So it does not have to rain all day long. February brings the most rainy days (16.0) on the Cook Islands. With an average of only 6.8 days, July is the friendliest. In the United States, it rains most often in May with 8.3 days.

Precipitation amount per day

Depending on the season and the location of a country, the wind brings a varying amount of water with it. As a rule, the water evaporating in the oceans is absorbed and then transported inland. The greatest amount of rain (hail or dew are also forms of precipitation) on the Cook Islands occurs in February, when about 8.0 liters per square meter fall per day. In the United States, the average amount of precipitation ranges from 1.9 liters per day in January to 3.1 in June. However, these are average values. If you consider that there are only 16.0 rainy days on the Cook Islands in February, each of them accounts for about 14.9 liters.

Sunshine hours per day

With 2,628 hours of sunshine per year, the United States is in the lead. The most hours of sunshine (9.7 per day) are in July. The Cook Islands falls into second place with only 2,300 hours. There the sun is visible in June for only 5.4 hours per day, so not hidden behind clouds.

Hours of daylight

The length of a day varies throughout the year and depends on the distance from the equator. In June, the day on the Cook Islands is only 10.9 hours long. In December, on the other hand, it is 13.4 hours. In the United States, it is 9.2 hours in December and 15.3 in June.
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