Some Facts about Rainfall in Nepal : Monthly, Average, Data etc

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With reference to the regional distribution of summer rainfall in Nepal, one striking feature is the occurence of highest amount of rainfall in the Pokhara Valley located in the central part of the midland region. A place called Lumle near Pokhara town receives about 518 cm. of rain, whereas Pokhara Hospital in the valley floor receives only 358 cm.

This remarkably high amount of rainfall in the places noted above may be attributable to three factors :

(a) the rapid ascent of saturated air from over various lake surfaces

(b) its rapid cooling induced by the Machhapuchhre and Annapurna Himalayas close at hand

(c) largest number of rainy days (136 days).

Probably no other reason may hold true for this surprising phenomenon. On the other hand, the Kathmandu Valley located in the same midland region gets moderate amount of rain (about 143 cm.). According to Nayava, the onset of monsoons in the Kathmandu Valley occurs normally on 12th June and retreats on 21st September.

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Rainfall in winter season of Nepal

During winter, north-east monsoons blow in the north-east part of Nepal. Since these are dry and cold winds originating from land surface, these contribute very negligible proportion of rain. In this season, the main source of rain is the westerly cyclones approaching from the Mediterranean Sea. The total amount as well as the intensity of rain there from is definitely lower than that from summer monsoons. Since the cyclones move from west, these contribute more precipitation in the western sector and it irregularly goes on diminishing towards the east. It is about 30 cm. in the western part, 15 cm. in the central part and less than 15 cm. in the eastern part. In its distribution along north-south direction, specially in the central and eastern parts of Nepal, no distinct variation can be visualized. There is, however, an apparent difference in rainfall distribution between the terai or madhesh and mountain sections of western Nepal. As the tracks of westerly depressions lies more towards north, the hilly and mountainous parts receive higher amount of precipitation (about 40 cm.) than the corresponding terai or madhesh parts (about 25 cm.).

Moreover, much of the precipitation, particularly in hill tops and high mountains, occurs in the form of snow. This snowfall in western mountains is relatively very high. It normally remains on the ground for months together and breaks the usual line of communication. The terai or madhesh part, on the other hand, receives gentle rain which gradually goes on declining towards the east.

Average Temperature and Rainfall in Kathmandu Nepal
Place Summer (May, June, July) Winter (Dec, Jan, Feb)
Max (°C) Min (°C) Rain (mm) Max (°C) Min (°C) Rain (mm)
Kathmandu 28.1 19.5 312 19.3 3.0 15.4

Above Rainfall data in Nepal

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Average Temperature and Rainfall in Pokhara Nepal
Place Summer (May, June, July) Winter (Dec, Jan, Feb)
Max (°C) Min (°C) Rain (mm) Max (°C) Min (°C) Rain (mm)
Pokhara 29.7 21.3 829.7 20.3 7.7 26.3

Above Rainfall data in Nepal

Average Temperature and Rainfall in Chitwan Nepal
Place Summer (May, June, July) Winter (Dec, Jan, Feb)
Max (°C) Min (°C) Rain (mm) Max (°C) Min (°C) Rain (mm)
Chitwan 33.0 25.3 404.0 24.1 8.3 13.8

 All Above Rainfall data in Nepal is taken from welcomenepal.com

Monthly Rainfall in Nepal

This pictures show you the average monthly temperature and rainfall in Nepal in time of 1960 to 1990.

average monthly rainfall in Nepal

Annual Rainfall in Nepal

Let’s not talk about the monthly rainfall in Nepal. Let’s talk about annual rainfall in Nepal. Annual rainfall in Nepal corresponds to a great extent with that of summer season. The only difference lies in total amount and spatial coverage. It is because the areas of high annual rainfall tally greatly with those of high summer rainfall. But the total annual rainfall received by them increases from 10% to 40% approximately.

When seasons are taken in consideration, it is only the N. W. mountainous parts where the winter rain from westerly cyclones is as high as 40% of the total annual rainfall. Otherwise, in most parts of the country, there is the dominance of monsoonal rainfall (60% to 90%). At the same time, agricultural activities in most parts of the country are associated mainly with the period of monsoonal rainfall. As such, the concept of annual rainfall in the context of Nepalese agriculture looks virtually less significant than that of summer rainfall. Moreover, the high percentage of winter rainfall in western mountain areas bears little significance; for most of it falls in the form of snow. At the same time, its utilization for cropping purpose is almost impossible owing to very low temperature prevailing there in winter.

1 photo source: chinahighlights.com

2 photo source: worldbank.org

This article is emailed by Rakesh Bhandari from Gaushala Kathmandu, Nepal. Thanks to him. If any comment, complaints, please, contact us.

If you have any article, and want to share with us, please email us. our email id: imnepal.com@gmail.com

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Jitendra Sahayogee

I am Jitendra Sahayogee, a writer of 12 Nepali literature books, film director of Maithili film & Nepali short movies, photographer, founder of the media house, designer of some websites and writer & editor of some blogs, has expert knowledge & experiences of Nepalese society, culture, tourist places, travels, business, literature, movies, festivals, celebrations.

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