Climate in Eastern Region Nepal

Average daytime and nighttime temperatures

All climatic diagrams on this site result from the collected data from two measuring weather stations in Eastern Region.
Weather stations at an altitude above 2130m have not been included.
All data correspond to the average monthly values of the last 20 years.

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Several months of the year it is warm to hot at temperatures continuously above 25 degrees centigrade, sometimes up to 27 degrees.
Overview: Climate in Nepal
Daylengths and sun positions in Nepal
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Hours of sunshine per daySunshine hours per day in Eastern Region
The number of hours of sunshine refers to the time when the sun is actually visible. That is, without any obstruction of visibility by clouds, fog or mountains. With 8 hours per day, November is the sunniest month in the region of Eastern Region. In July the sun shines the shortest.
Rainy days per monthRainy days per month in Eastern Region
A rainy day is a day on which at least an amount of 0.1 mm precipitation (=0.1 liter) per square meter falls. This can be rain, snow, hail or even dew. So it does not have to rain the whole day. With 21 rainy days, July offers the most number of rainy days, and in November the least.
Precipitation in mm/dayPrecipitation in Eastern Region
The amount of precipitation is measured in millimeters per square meter. Thus, at two mm/day, two liters of water fall on one square meter within 24 hours. With only 0.1 mm, the least rain falls in November. July, on the other hand, has the most rain.
Relative humidity in %Relative humidity in Eastern Region
Warm air can absorb more moisture than cold air. The relative humidity indicates how much moisture of the physically possible is actually contained in the air. At high humidity, the person feels uncomfortable and perceives this as oppressive. In general, a relative humidity of 40-60% gives as pleasant. With only 66% humidity on average, it is quite dry in April. The highest value of 93% is experienced here in July.
Absolute humidity in g/m³Absolute humidity in Eastern Region
In warm months, there is also a higher absolute humidity almost everywhere. At a temperature of 25°C, air can absorb up to 23 grams of water per cubic meter. At 20°C, it is only 17.3 grams. A relative humidity of 40% at 25°C thus corresponds to an absolute humidity of 9.2 grams of water. From a proportion of approx. 13.5 grams, humans perceive the air as muggy. This limit is reached in 6 months in Eastern Region, although these are average values, and a month is rarely completely or not at all considered humid.
Humidex in °CHumidex in Eastern Region
The "Humidex" (humidity index) is an index of well-being in warmer areas, calculated from the air temperature, relative humidity and dew point. The index corresponds approximately to the temperature felt. At high temperatures, the body transports heat away by sweating. At high humidity the ambient air can only absorb a small amount of sweat and thus one feels uncomfortable. An index of 20-29 is considered comfortable. Up to 39, people perceive the air as slightly uncomfortable, and above 40, as very uncomfortable. Values above 45 are dangerous in the long run and often lead to heat stroke.
Climate charts for other regions in Nepal

Map of Eastern Region

Most important cities in Eastern Region

Alone 2 cities with over 100,000 inhabitants are located here. The region has a west-east extension of about 190 km and over 160 km from north to south.

CityPopulationGeo position
Biratnagar201,12526° 28' 59"N87° 17' 0"E
Dharan Bazar116,18126° 48' 45"N87° 17' 1"E
Ithari47,98426° 40' 0"N87° 16' 60"E
Rajbiraj33,06126° 31' 60"N86° 45' 0"E
Lahan31,49526° 43' 46"N86° 29' 43"E
Siraha24,65726° 39' 15"N86° 12' 31"E
Khandbari22,90327° 22' 29"N87° 12' 14"E
Dhankuta22,08426° 58' 60"N87° 19' 60"E
Bhadrapur19,52326° 32' 39"N88° 5' 40"E
Ilam17,49126° 54' 34"N87° 55' 42"E
Lobujya8,76727° 56' 60"N86° 49' 0"E
Bhojpur3,25027° 10' 17"N87° 2' 46"E

Data basis: German Weather Service, individual values averaged and supplemented by own elements. Data on cities and inhabitants:, United Nations Statistics Division and own research.
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