Climate - Nepal

In Nepal, there are different climates according to altitude: the sub-tropical climate with a rainy season in the southern flat strip, the temperate climate in the low mountains, and finally, the cold mountain climate in the peaks of the Himalayas.
Rainfall is abundant in the period of the summer monsoon (June to early October), which, however, penetrates with difficulty in some sheltered inland valleys and on the northern slopes. On the southern slopes, at equal altitude, the east is rainier than the west.

Index

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• The plain - Nepalganj
• The Himalayas - Pokhara, Kathmandu, Jumla
• Cyclones

The plain

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In the thin southern plain, a region known as Terai, the climate is that of the Indo-Gangetic plain, which is also found in northern India. In winter, it's sunny and mild, pleasantly warm during the day but cool at night, sometimes even cold. The average temperatures in January is around 15 °C (59 °F). Sometimes fog can form.
By March, the temperature rises considerably and it begins to be hot, while from April to June it's scorching hot, and highs can reach or exceed 40 °C (104 °F).
In June, the summer monsoon arrives, characterized by heavy rains, in the form of downpours and thunderstorms. The monsoon arrives first in the east, in early June, while in the west it comes in the middle of the month or so. The temperature decreases, with the maximum dropping to around 33 °C (91 °F) in July and August, but the humidity increases, making the heat muggy. The rains are intense especially in July and August, when they exceed 300 millimeters (12 inches) per month, but in certain areas at the foot of the mountains, especially in the east of the country, they can exceed 600 mm (23.5 in) per month.

Nepalganj

In Nepalganj (or Nepalgunj), located in the southwest near the border with India, in winter, from mid-November to late February or early March, nights are cool, and sometimes even cold. In January 2013, the temperature dropped to 0 °C (32 °F).
In addition, from November to February, fog can form at night and in the early morning. The fog usually dissolves during the day, however, in these situations, it can sometimes be cool even during the day, with highs of 14/15 °C (57/59 °F), and sometimes even below.
From mid-March to mid-June, before the monsoon, it is very hot. The temperature reached 45 °C (113 °F) in June 1995.
Here are the average temperatures in Nepalganj.

Here is the average precipitation in Nepalganj.

The monsoon starts to withdraw by early October in the west, and about a week later in the east. The weather returns to be sunny, and even though October is still a hot month, the humidity decreases and the night temperature becomes a bit cooler.
In the easternmost part of the flat area (see Biratnagar), the increase in temperature in the period from March to June is limited, in fact, the average maximum temperature does not go above 33/34 °C (91/93 °F) in April and May. Here, already in the second half of April, the first afternoon thunderstorms occur, prior to the arrival of the monsoon itself.

The Himalayas

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Above 800/1,000 meters (2,600/3,300 feet), the climate is temperate, while the rainfall pattern is the same.

Pokhara

In Pokhara, at 800 meters (2,600 feet), the average temperature ranges from 13.5 °C (56 °F) in January to 26 °C (79 °F) in July and August.
In winter, the temperature can drop to around 0 °C (32 °F) on colder nights. Sometimes fog can form. During the day, temperatures are very similar from April to September.
The highest temperatures of the year typically occur before the monsoon, in May and sometimes in April, albeit for short periods.
Here are the average temperatures.

Pokhara is the rainiest city of Nepal because it is located at the foot of the Annapurna Range, where the southern currents that prevail in summer are forced to rise when they encounter the mountain slopes. In fact, rainfall amounts to 3,900 mm (153 in) per year, including up to 940 mm (37 in) in July and 865 mm (34 in) in August. However, here too in winter the rains are rare, but there can be some atmospheric instability already in spring, with significant thunderstorms in April and May. Here is the average precipitation.

Kathmandu

In the capital, Kathmandu, at 1,400 meters (4,600 feet) above sea level, the climate is mild.
The average January temperature is around 11 °C (51.5 °F), but the temperature range is high, so it gets cold at night, while during the day the sun makes the air mild. Sometimes the temperature can drop as low as 0 °C (32 °F) or slightly below. The coldest record is -3.5 °C (25.7 °F) and was set in January 1978. Also, fog can form at night.
Summer is hot, with highs around 27/29 °C (81/84 °F) for a long period, from April to October. Generally, the highest temperatures of the year are recorded before the monsoon, in May and sometimes in April, with highs of around 35 °C (95 °F).
Here are the average temperatures.

Annual rainfall amounts to 1,450 mm (57 in), of which 125 mm (4.9 in) fall already in May (due to thunderstorms that precede the monsoon), and up to 365 mm (14.3 in) in July, which is the rainiest month. In September, still 200 mm (7.8 in) of rain fall, and 50 mm (2) in October, concentrated in the first part of the month, before the monsoon withdraws. Here is the average precipitation.

In Kathmandu, and in Nepal in general, the sun shines quite often in winter and very often in spring, before the monsoon. In contrast, in the rainy season, especially from July to September, the sky is often cloudy, so it's difficult to spot the highest mountains of the Himalayas. Here are the average sunshine hours per day in Kathmandu.



Going up in altitude, both temperature and rainfall vary with altitude. In theory, they also vary with slope exposure, however, since most of the mountains of Nepal are situated on the southern side, the temperature is relatively mild even at high altitudes. However, above 2,000 meters (6,500 feet), in winter, the temperature often drops below freezing at night.

Jumla

Here are the average temperatures of Jumla, located at 2,300 meters (7,500 ft).

In the areas closed between the mountains, the summer monsoon penetrates with more difficulty. In Jumla, only 810 mm (32 mm) of rain fall per year. Here is the average rainfall.

Some particularly sheltered inland valleys receive an even lower amount of rainfall, and have a desert or semi-desert landscape, such as the kingdom of Mustang, which is located in an arid valley north of the massifs of Annapurna and Dhaulagiri.

Going up in altitude, usually, the average temperature in January drops below freezing (0 °C or 32 °F) above 3,000 meters (9,800 ft). Above 3,600 meters (11,800 ft), the subarctic climate zone begins, that is, where the average temperature of the warmest month does not exceed 10 °C (50 °F).
Perennial snows in Nepal are found at very high altitudes, around 6,000 meters (20,000 feet).

In Nepal, some of the highest mountains on Earth are found: Mount Everest, the highest, with its 8,848 meters (29,029 feet), on the border with China; Kanchenjunga, the third highest mountain in the world, 8,586 meters (28,169 feet), on the border with the Indian state of Sikkim; Lhotse, the fourth, 8,516 meters (27,940 feet), located just 3 kilometers (2 miles) south-east of Mount Everest and still on the border with China; Makalu, the fifth, 8,481 meters (27,766 feet), 20 km (12 mi) south-east of Mount Evererst and still on the border with China; Cho Oyu, the sixth, 8,201 meters (26,906 feet), 28 km (17 mi) north-west of Mount Everest and still on the border with China; Dhaulagiri, the seventh, located in the interior of Nepal and not at the border, 8,167 m (26,795 ft); Manaslu, the eighth, 8,156 m (26,759 ft), and Annapurna, the ninth, 8,091 m (26,545 ft).
At the base camp of Mount Everest, in the Khumbu glacier, 5,300 meters (17,400 ft) above sea level, only 450 mm (17.5 in) of rain or snow fall per year. Here, the average temperature is around -18 °C (0 °F) in January and -2 °C (28 °F) in July, while at the Everest's summit it's around -36 °C (-33 °F) in January and -18 °C (0 °F) in July. On the highest peaks of Nepal, terrible wind storms occur, especially in winter.

Tropical cyclones

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Nepal is too far from the sea to be directly hit by tropical cyclones, but the remains of cyclones affecting India, which usually come from the Bay of Bengal, can cause heavy rains in the Nepalese plains as well as snow in the mountains, as happened on October 14, 2014, when heavy snowfalls caused avalanches in the Annapurna and Dhaulagiri areas, as a result of the approach of the remains of Cyclone Hudhud. In order to avoid these accidents, it is advisable to consult the weather forecasts and the official warnings, as well as to rely on local expert guides.
Cyclones typically occur from mid-April to early December, but they are most likely in May-June and October-November.

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