Winter Weather at Cassidy International Airport Kiribati

Daily high temperatures are around 85°F, rarely falling below 82°F or exceeding 87°F. The lowest daily average high temperature is 84°F on January 26.

Daily low temperatures are around 77°F, rarely falling below 75°F or exceeding 81°F. The highest daily average low temperature is 78°F on January 6.

For reference, on June 8, the hottest day of the year, temperatures at Cassidy International Airport typically range from 78°F to 86°F, while on February 5, the coldest day of the year, they range from 77°F to 84°F.

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.

Fortaleza, Ceará, Brazil (8,222 miles away); Fernando de Noronha (Distrito Estadual), Pernambuco, Brazil (8,645 miles); and Tibanbang, Philippines (5,285 miles) are the far-away foreign places with temperatures most similar to Cassidy International Airport (view comparison).

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The winter at Cassidy International Airport experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 52% throughout the season. The highest chance of overcast or mostly cloudy conditions is 55% on January 15.

The clearest day of the winter is February 19, with clear, mostly clear, or partly cloudy conditions 50% of the time.

For reference, on April 21, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 56%, while on August 26, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 66%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At Cassidy International Airport, the chance of a wet day over the course of the winter is very rapidly increasing, starting the season at 10% and ending it at 21%.

For reference, the year's highest daily chance of a wet day is 34% on April 19, and its lowest chance is 6% on September 7.

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 at Cassidy International Airport is rapidly increasing, starting the season at 1.7 inches, when it rarely exceeds 5.8 inches or falls below -0.0 inches, and ending the season at 2.8 inches, when it rarely exceeds 7.8 inches.

The highest average 31-day accumulation is 2.8 inches on February 21.

Over the course of the winter at Cassidy International Airport, the length of the day is essentially constant. The shortest day of the winter is December 19, with 12 hours, 1 minute of daylight and the longest day is February 28, with 12 hours, 4 minutes of daylight.

The earliest sunrise of the winter at Cassidy International Airport is 6:18 AM on December 1 and the latest sunrise is 24 minutes later at 6:42 AM on February 8.

The earliest sunset is 6:19 PM on December 1 and the latest sunset is 26 minutes later at 6:45 PM on February 13.

Daylight saving time is not observed at Cassidy International Airport during 2025.

For reference, on June 21, the longest day of the year, the Sun rises at 6:24 AM and sets 12 hours, 14 minutes later, at 6:38 PM, while on December 21, the shortest day of the year, it rises at 6:27 AM and sets 12 hours, 1 minute later, at 6:28 PM.

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.

The figure below presents a compact representation of key lunar data for the winter of 2025. 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.

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 at Cassidy International Airport is essentially constant during the winter, remaining around 100% throughout.

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 at Cassidy International Airport is gradually increasing during the winter, increasing from 13.7 miles per hour to 14.5 miles per hour over the course of the season.

For reference, on January 12, the windiest day of the year, the daily average wind speed is 15.3 miles per hour, while on May 23, the calmest day of the year, the daily average wind speed is 11.9 miles per hour.

The highest daily average wind speed during the winter is 15.3 miles per hour on January 14.

The hourly average wind direction at Cassidy International Airport throughout the winter is predominantly from the east, with a peak proportion of 95% on December 22.

Cassidy International Airport 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 at Cassidy International Airport is essentially constant during the winter, remaining around 80°F throughout.

The lowest average surface water temperature during the winter is 80°F on January 30.

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 at Cassidy International Airport 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.

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 at Cassidy International Airport are very rapidly decreasing during the winter, decreasing by 8,559°F, from 10,303°F to 1,744°F, over the course of the season.

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 at Cassidy International Airport is essentially constant during the winter, remaining within 0.3 kWh of 6.5 kWh throughout.

For the purposes of this report, the geographical coordinates of Cassidy International Airport are 1.986 deg latitude, -157.350 deg longitude, and 20 ft elevation.

The topography within 2 miles of Cassidy International Airport is essentially flat, with a maximum elevation change of 52 feet and an average elevation above sea level of 8 feet. Within 10 miles is also essentially flat (75 feet). Within 50 miles is also essentially flat (92 feet).

The area within 2 miles of Cassidy International Airport is covered by water (100%), within 10 miles by water (99%), and within 50 miles by water (100%).