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Climate - Christmas Island


Average weather, temperature, rainfall, sunshine

Flag - Christmas Island

Map - Christmas Island

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Climate chart - The Settlement
Christmas Islands is a territory of Australia located in the Southern Indian Ocean, at 10 degrees south latitude and 375 km (235 mi) southwest of Java, and has a tropical climate, with a rainy period from November to June and a quite dry period from July to October.
Most of the island is occupied by hills, which reach up to 320 meters (1,050 feet) of altitude, and is covered by forests.
The capital and largest city is Flying Fish Cove (or The Settlement). There is a part on the coast and a part on the hills, at 220 meters (720 feet) above sea level.
The airport, from which the meteorological data are taken, is located in the upper part of the island, at 280 meters (920 ft) above sea level, so the temperatures are a little lower (nearly two degrees Celsius) than on the coast.
So, given that highs are around 26/27 °C (79/81 °F) from June to November and around 28 °C (82 °F) from December to May, it can be estimated that at sea level they vary from 28 to 30 °C (82 to 86 °F).
Furthermore, the records vary slightly compared to the average. At night, the temperature rarely drops below 20 °C (68 °F), however, in December 2018, it dropped to 17 °C (62.5 °F). During the day, on the hottest days the temperature typically reaches 29 °C (84 °F) from December to May, although in January 2019 it reached 31.4 °C (88.5 °F). In 1983, year of El Niño, the same temperature was reached in February, March and April.
Here are the average temperatures.
The Settlement - Average temperatures (1991-2020)
MonthMin (°C)Max (°C)Mean (°C)Min (°F)Max (°F)Mean (°F)
January232825.3738277.5
February232825.4738277.7
March232825.6748378.1
April242825.9758378.6
May242825.7758278.2
June232725.1748077.3
July232624.3737975.7
August222624727875.2
September222624.1727975.3
October232724.7738076.5
November232725.1738177.1
December232825.1738277.2
Year22.927.124.9573.280.877

The main difference in the climate is found in the rainfall, which amounts to 2,100 millimeters (83 inches) per year, and it's much more abundant in the rainy season, from November to June, while the rains are rarer and shorter from July to October. The rainiest months are January, February and March, when about 300/350 mm (12/14 in) of rain fall per month, while the driest months are August and September, when precipitation amounts to less than 60 mm (2.3 in) per month. The rainy period is accompanied by high humidity, which brings low clouds and mists on the inland hills.
Here is the average precipitation.
The Settlement - Average precipitation
MonthMillimetersInchesDays
January29511.615
February34513.617
March3051218
April2309.115
May1857.311
June1706.710
July1003.98
August401.66
September552.24
October803.14
November1556.17
December2208.712
Year219086.2128

As for the wind , from May to November the south-east trade winds prevail, which blow steadily and reach their maximum in the driest period, from July to October, when the average speed exceeds 20 kph (12.5 mph) even at 9 am.
In the rainy period, especially from January to March, the wind is weaker and more variable, and sometimes tropical depressions can form, linked to the north-west monsoon that affects the island of Java. These depressions can cause periods of bad weather, which can last a few days, and even strong winds, which hit in particular the northern coast. Sometimes, cyclones can also pass (see below).

Between October and November, at the beginning of the rainy season, the famous red crab migration occurs on the island: millions of crabs come out from the forest, where they had been hiding in the dry season, and migrate to the beach, to mate and lay their eggs.

Red crabs on Christmas Island

The sea in Christmas Island is warm enough to swim in all year round, as you can see in the following table.
The Settlement - Sea temperature
MonthCelsius (°C)Fahrenheit (°F)
January2882
February2984
March2984
April2984
May2984
June2882
July2781
August2781
September2679
October2781
November2882
December2882
Year27.982.3

Tropical cyclones



Christmas Island is on the edge of the area where tropical cyclones of the Southern Indian Ocean can form, so it is not directly affected by them in the acme of their intensity, but it's brushed by tropical storms or cyclones in the early stages of their formation. In theory, this can happen from November to mid-May, even though, in the last thirty years, it only happened from November to April, with a peak in December.
The island was hit, without very serious damage, by Cyclone Rosie in April 2008 and by Cyclone Gillian in March 2014.

When to go and what to pack in Christmas Island

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