Here atmosphere differs from cool summers and serious winters in north to subtropical summers and gentle winters in south. Nepal has a lot of variety in atmosphere. Nepal encounters four periods of atmosphere spring, summer, pre-winter and winter. The atmosphere is changed going from the sub-tropical Terai to the cool dry temperature and high atmospheres in the northern Himalayan extents.
In the Terai, the most blazing part of the nation, summer temperatures may ascend as high as 40OC. the atmosphere is hot and sticky. Precipitation is far reaching amid the south-west storm time frame from June to August with the eastern part getting the most extreme precipitation. The period from October to May is by and large dry in many parts of the nation. Yearly precipitation differs from around 300 mm in the northern and western territories to more than 250 mm in the eastern districts. Kathmandu valley gets around 1300 mm of yearly precipitation with an overwhelming fixation from June to August. Its scope is about the same as that of Florida, and a tropical and subtropical atmosphere exists in the Terai Region.
Outside the Terai, be that as it may, the atmosphere is totally distinctive. The striking contrasts in climatic conditions are fundamentally identified with the huge scope of elevation inside such a short north-south separation. The nearness of the east-west-inclining Himalayan massifs toward the north and the monsoonal adjustment of wet and dry seasons likewise incredibly add to nearby varieties in atmosphere.
Researcher Sharad Singh Negi distinguishes five climatic zones in Nepal taking into account height:
• the tropical and subtropical zone of beneath 1,200 meters in elevation;
• the cool, calm zone of 1,200 to 2,400 meters in elevation;
• the icy zone of 2,400 to 3,600 meters in elevation;
• the subarctic climatic zone of 3,600 to 4,400 meters in elevation and
• the ice zone above 4,400 meters in elevation.
As far as normal vegetation administrations or appropriation designs, elevation again assumes a huge part. Underneath 1,200 meters, the overwhelming type of vegetation comprises of tropical and subtropical downpour timberlands.
Height additionally influences yearly precipitation or precipitation designs. Up to around 3,000 meters, yearly precipitation sums increment as the elevation increments; from that point, yearly aggregates reduce with expanding height and scope. Notwithstanding this latitudinal separation in precipitation, two different examples can be observed. To start with, given the northwestward development of the dampness loaded summer rainstorm (June to September), the measure of yearly precipitation by and large reductions from east to west. Be that as it may, there are sure pockets with overwhelming yearly precipitation sums, for instance, the Pokhara Valley in focal Nepal. Second, the level augmentation of slope and mountain ranges makes a soggy condition on south and eastfacing inclines while it delivers a noteworthy downpour shadow on the northern sides of the slants. The aridity increments with height and scope, particularly on the northern slants, and achieves its peak in the inward Himalayan district and on the Tibetan Plateau. Eastern Nepal gets roughly 2,500 millimeters of downpour every year, the Kathmandu region around 1,420 millimeters, and western Nepal around 1,000 millimeters.
The towering Himalayas assume a basic part, hindering the northwesterly advances of wet, tropical air from the Bay of Bengal, and at last prompting its transformation to rain in the mid year. In the winter, this extent keeps the upheavals of chilly air from Inner Asia from achieving southern Nepal and northern India, consequently guaranteeing hotter winters in these locales than generally would be the situation.
Also, there are regular varieties in the measure of precipitation, contingent upon the storm cycle. Priest separates the rainstorm cycle into four seasons: premonsoon, summer storm, postmonsoon, and winter rainstorm. The premonsoon season for the most part happens amid April and May; it is portrayed by the most astounding temperatures, achieving 40° C amid the day in the Terai Region and different swamps. The slopes and mountains, nonetheless, stay cool.
The late spring rainstorm, a solid stream of clammy air from the southwest, takes after the pre-storm season. For by far most of southern Asians, including Nepalese, the term rainstorm is synonymous with the mid year stormy season, which represents the moment of truth the lives of a huge number of agriculturists on the subcontinent. Despite the fact that the entry of the late spring rainstorm can fluctuate by as much as a month, in Nepal it for the most part arrives before the actual arranged time June, is gone before by fierce lightning and electrical storms, and keeps going through September, when it starts to retreat. The fields and lower Himalayas get more than 70 percent of their yearly precipitation amid the late spring storm. The measure of summer storm rain for the most part decreases from southeast to northwest as the oceanic wedge of air bit by bit gets to be more slender and dryer. In spite of the fact that the accomplishment of cultivating is absolutely reliant on the auspicious entry of the mid year storm, it intermittently causes such issues as avalanches; resulting misfortunes of human lives, farmlands, and different properties (also incredible trouble in the development of merchandise and individuals); and overwhelming flooding in the fields. Then again, when drawn out breaks in the mid year storm happen, extreme dry spell and starvation frequently come about.
The post rainstorm season starts with a moderate withdrawal of the storm. This retreat prompts a practically finish vanishing of soggy air by mid-October, along these lines introducing by and large cool, clear, and dry climate, and additionally the most casual and convivial period in Nepal. At this point, the harvest is finished and individuals are in a merry state of mind. The two greatest and most critical Hindu celebrations - Dashain and Tihar (Dipawali)- - touch base amid this period, around one month separated. The post rainstorm season endures until about December.
After the post storm, comes the winter rainstorm, a solid northeasterly stream, which is set apart by infrequent, short rainfalls in the swamps and fields and snowfalls in the high-height zones. The measure of precipitation coming about because of the upper east land exchange winds shifts extensively however increments especially with height. The auxiliary winter precipitation as snowfalls in the Himalayas is essential for creating an adequate volume of spring and summer meltwaters, which are basic for watering system in the lower slopes and valleys where farming prevails. Winter precipitation is likewise are crucial for the accomplishment of winter products, for example, wheat, grain, and various vegetables.
Nepal has four particular seasons. Spring, from March to May is warm and dusty with downpour showers. Summer, from June to August, is the storm season when the slopes turn rich and green. Fall, from September to November, is cool with clear skies, and is the most prominent trekking season. In winter from December to February, it is chilly around evening time and can be foggy in the early morning yet evenings are typically clear and wonderful, however there is infrequent snow in the mountains.
Climate condition in Nepal change from locale to district. Summer and late spring temperatures range from more than 40 Degrees Celsius in the Terai to around 28 Degrees Celsius in the uneven district of the nation. In winter, normal most extreme and least temperatures in the Terai range from a mellow 23 Degrees Celsius to a lively 7 Degrees Celsius while the focal valleys experience a cold 12 Degrees Celsius greatest temperature and a base temperature frequently falling beneath the point of solidification.
Much colder temperatures win at higher rises. The Katmandu Valley arranged at an elevation of 1310m, has a convenient yet equable atmosphere with normal summer and winter temperatures of 27 Degrees Celsius to 19 Degrees Celsius and 20 Degrees Celsius to 2 Degrees Celsius separately. The yearly precipitation in Katmandu for the most part surpasses 1300mm. The mean yearly precipitation ranges from more than 6000mm along the southern slants of the Annapurna range in focal Nepal to not exactly the 250mm in the north focal segment close to the Tibetan level. Sums differing somewhere around 1500 and 2500mm prevail over a large portion of the nation. On a normal, around 80% of the precipitation is bound to the rainstorm time frame (June-September).
Best Seasonality
Entry figures to most destinations demonstrate that for the Nepalese sightseers is favored dry season from October to November. The climate is moderate, the air is spotless, perceivability is flawless and the field is rich and green after the rainstorm. October is the ideal opportunity for celebrations in Nepal. From February until April, the last part of the dry season is the second-best period. December and January is not suggested for going in Nepal.
Whatever is left of the year is genuinely upsetting for voyaging: May and early June are for the most part excessively hot and dusty for solace, and the storm from mid-June to September darkens the mountains in cloud and turns trails and streets to mud. Flying is frequently the best way to achieve remote ranges right now of year, and the western fringe intersections to India are regularly blocked.