Climate - Cambodia

In Cambodia, a Southeast Asian country overlooking the Gulf of Thailand, the climate is tropical, hot all year round, with a rainy season from May to mid-November due to the south-west monsoon and a dry season from mid-November to April. The dry season can be divided into two periods: the first is the least hot of the year, while the second, from mid-February to May, before the monsoon arrives, is the hottest of the year. The monsoon withdraws in early November in the north and between the middle and the end of the month in the center-south.
The coolest month is December, while the hottest months are April and May, when the heat becomes oppressive; in the rainy season, the temperature is a bit lower, but the humidity is higher, so the weather is hot and muggy.
As for the rains, they generally range from 1,300 to 1,800 millimeters (51 to 70 inches) per year in the main cities located in inland areas. The wettest region of Cambodia is the south-western one, since in the monsoon period the currents come directly from the sea: here, the rainfall exceeds 2,000 mm (78 in) per year, but in the central-northern part, towards the coast of the Gulf of Thailand, it even exceeds 3,000 mm (118 in) and there are vast areas covered with forest.
The climate is a bit cooler in the highlands, such as the Cardamon Mountains, whose highest point is Phnom Aural, 1,800 meters (5,900 ft) high, and whose slopes are covered by an impenetrable forest and are protected by a nature reserve. The mountainous areas, in addition to being the coolest, are also the rainiest: they receive up to 5,000 millimeters (197 inches) of rain per year, and may experience some showers in the afternoon even before the monsoon season (ie from February to April).

Phnom Penh

In the capital, Phnom Penh, the daytime temperature is 30 °C (86 °F) in December, it begins to rise slightly already in January, and it reaches its highest values in April, with an average of 35 °C (95 °F), but with peaks of 40 °C (104 °F); then, it decreases slightly during the long rainy months. Here are the average temperatures.

In Phnom Penh, 1,400 mm (55 in) of rain fall per year, with a minimum in January, when it almost never rains, and a maximum in October, when rainfall reaches 250 mm (10 in). The latter part of the monsoon period is therefore the wettest, and presents the greatest risk of flooding, especially in the area crossed by the great river, the Mekong. Here is the average precipitation.

The amount of sunshine in Cambodia is good from December to February, but also in March and April, despite the first thunderstorms, while it's barely sufficient if not low from June to October because of the cloudiness brought by the monsoon. Phnom Penh gets 2,500 hours of sunshine per year, as can be seen in the following table.



The climate of the ancient capital, Angkor Wat, located in the northwest of the country, is similar to that of Phnom Penh. However, lying in the northern part, the monsoon in Angkor Wat retreats a bit sooner (i.e. in early November), in addition, the winter temperature is slightly lower.

Kampot

Along the coast, because of the thermal inertia of the sea, in the pre-monsoon season, it does not get as hot as in the interior, as we can see from the temperatures of Krong Kampot, which is located in the south, near the border with Vietnam.

As mentioned, the rains are more abundant on the coast, in fact, they amount to almost 2,000 mm (80 in) per year. In addition, the rainiest months here are July and August, when the rainfall exceeds 300 mm (12 in) per month. Here is the average precipitation.

The sea in Cambodia is warm enough to swim in all year round, as we can see in the following table, relative to the sea temperatures.

Koh Kong

Further north, on the island of Koh Kong, near the border with Thailand, temperatures are similar.

As mentioned, the northern part of the coast, being exposed to the west, is particularly rainy, in fact, it receives more than 4,000 mm (157 in) of rain per year. In particular, the rains are very abundant and occur almost daily from June to September.

In Koh Kong too, the sea is warm all year round, as can be seen in the following table.

Typhoons

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Cambodia can be hit by typhoons, the tropical cyclones of the western Pacific, though they are quite rare because they usually pass to the north and hit Northern Vietnam and Laos. Moreover, when typhoons affect Cambodia, they are generally weakened because they have released the bulk of their energy over the coasts of Southern Vietnam. However, they can still bring heavy rains, which can cause flooding. In theory, typhoons can occur between June and December, but in Cambodia, they generally pass from mid-October to mid-November, with a maximum at the beginning of November.

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