Cambodia's temperatures range from 10° to 38°C (50° to 100°F) and experiences tropical monsoons. Southwest monsoons blow inland bringing moisture-laden winds from the Gulf of Thailand and Indian Ocean from May to October. The northeast monsoon ushers in the dry season, which lasts from November to March. The country experiences the heaviest precipitation from September to October with the driest period occurring from January to February.

It has two distinct seasons. The rainy season, which runs from May to October, can see temperatures raise up to 40°C around April and is generally accompanied with high humidity. The dry season lasts from November to April when temperatures can drop to 22°C. The best months to visit Cambodia are November to January when temperatures and humidity are lower.

Cambodia has a wealth of traditional and international festivals. Most of these are a time of great rejoicing for the predominantly rural populace, many of whom flock to the capital to join in the celebrations and witness the organized fireworks displays which accompany the festivals. It is at these times the nation unites with a shared common understanding of values and traditions and they are looked forward to with great expectation. Even in times of hardship people try even harder to make these times special. All the traditional festivals are influenced by the concepts of Buddhism, Hinduism and royal cultures. The following are the most important of the celebrations organized throughout the year.

National Day (January 7)
One of the more recent additions to the festival calendar, this day marks the end of the Khmer Rouge regime. However for many Khmers it also marks the start of the Vietnamese regime seen as another period of foreign occupancy.

Chinese New Year (January or February)
Due to the large number of people of Chinese descent who run much of Cambodia’s business enterprises and Vietnamese immigrant communities, the Chinese New Year is widely celebrated, especially in Phnom Penh. No Chinese festival would be complete without fireworks and this time of year is no exception with many wealthy families organizing their own private displays which light up the skies for all to see.

Khmer New Year’s Day (Mid April)
Celebrated at the same time as the Thai New Year all over the country this festival marks the turn of the year based on the ancient Khmer calendar and also marks the end of the harvest done during the year. Cambodians decorate their homes to please the ‘Heaven God’ and many people can been seen on the streets armed with small bags of water and water pistols to ‘bless’ people passing by. This festival is one of the happiest times of the year with joyous smiling faces everywhere you turn. Cambodians do recognize International New Year on 1 January but there are no celebrations then.

Royal Plowing Day (May)
Cambodia has a deep connection with the Earth and farming, and there is a deep astrological belief that the Ox has an instrumental role in determining the fate of the agricultural harvest each year. Every year, in May, this cultural ceremony takes place in the large park next to the Royal Palace and in front of the National Museum. The King plays a key role in driving the Ox and depicting real plowing activities in the process of growing rice. The Ox is given a selection of foods and beverages to consume and the royal soothsayers interpret what the Ox has eaten. For this festival both men and women can be seen wearing brightly colored traditional Khmer costume.

King Sihanouk’s birthday celebration (October 31st)
This celebration revering the country’s influential king takes place in late October or early November. People from all over the country come to the capital to join in celebrations and festivities held throughout the capital. Often the King’s birthday and Water festivals coincide resulting in a mammoth celebration in front of the Royal Palace and along the riverfront. Provincial villagers who would ordinarily have no reason to visit Phnom Penh will save up and make this occasion their sole visit to the capital.

Water Festival (October or November)
This vast festival is probably the most extravagant festival in the calendar. Over three days starting with the last full moon day in October or the beginning of November up to a million people from all walks of life from all over the country flock to the banks of the Tonle Sap and Mekong rivers in Phnom Penh to watch hundreds of brightly colored boats with over 50 paddlers battle it out for top honors. The boat racing dates back to ancient times marking the strength of the powerful Khmer marine forces during the Khmer empire. In the evening brightly decorated floats cruise along the river prior to and complimenting the fireworks displays. There is often a parallel festival at Angkor Wat and although it is smaller in scale it is just as impressive due to the backdrop of Angkor Wat.
The festival marks the changing of the flow of the Tonle Sap and is also seen as thanksgiving to the Mekong river for providing the country with fertile land and abundant fish. It is at this time when the river flow reverts to its normal down stream direction. The remarkable phenomenon that is the Tonle Sap sees the river flowing upstream during the rainy season and then change direction as the rains cease and the swollen Tonle sap lake empties back into the Mekong river leaving behind vast quantities of the fish.

Independence Day
This important ceremony takes place on the 9th of November at the site of the Independence Monument at the junction of Norodom and Sihanouk Boulevards. This ceremony celebrates Cambodia’s gaining of independence from France in 1953. All over the city flags adorn the shop fronts and bunting stretched over all the main thoroughfares as a sign of national pride.

Angkor Festival
This festival is held either in November or December and is a showcase of performing arts with Angkor Wat as a backdrop. Performers from all over Asia attend this festival performing great epic stories from myths and legends, including the Ramayana, with their own national dance costumes and musical and rhythmic interpretations. King Sihanouk often attends when he is in residence in Siem Reap and other dignitaries come to witness this wonderful spectacle.
International Half Marathon (Late December)

This International Half Marathon is held at Angkor Wat and attracts competitors from all over the world. Thousands of people come to see this international event held in the spectacular setting that is Angkor.

Pchum Ben (September)
This is the most culturally and religiously significant event of the year and is celebrated in September. This festival of souls concentrates on blessing the souls of ancestors, relatives and friends who have passed away. All Buddhist temples, especially Wat Phnom, are the focal points for this festival and most Cambodians visit the temples to make traditional offerings and pray.

Other Holidays and Festivals
Cambodia also celebrates other special days including: International Women's' Day (8 March), International Workers’ Day (1 May), Genocide Day (9 May), Vesak Buchea Day - the anniversary of the birth, enlightenment, and death of Buddha (Late May), Plowing the Holy Furrow (Late May), Chol Vassa - Buddhist Lent (July), and International Human Rights Day (10 December)