Biratnagar climate — normals and trends
Biratnagar (Nepal) has a humid subtropical, dry winter climate (Cwa) under the Köppen-Geiger classification. Its mean annual temperature is 24.7 °C and it receives 1,597 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is May (29.2 °C on average) and the coldest is January (16.6 °C). Rainfall peaks in July.
Biratnagar averages 0 frost days, 199 hot days (≥ 30 °C) and 142 rainy days per year.
Biratnagar has warmed by +1.7 °C between 1940 and 2025, or +0.19 °C per decade. This trend is statistically significant.
The hottest day of the period reached 45.8 °C (on 26 May 1957) and the coldest 4.7 °C (on 3 January 1967).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
BiratnagarKoshi
- coords
- 26.46°, 87.27°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
24.7°C
Average daily high
30.1°C
Average daily low
20.2°C
Annual rainfall
1,597mm
Sunshine / day
9.6h
Mean relative humidity
70%
Average peak wind
13.3km/h
Seasonal range
12.6°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
199 d/yr
Rainy days (≥ 1 mm)
142 d/yr
Annual snowfall
0.0 cm
Average feels-like high
32.9 °C
Average feels-like low
22.1 °C
Average peak gust
28.0 km/h
Tropical nights (≥ 20 °C)
212 d/yr
Solar radiation
16.4 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.7 °C
since 1940
+0.2 °C per decade · r² = 0.57 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
45.8 °C
26 May 1957
Coldest day
4.7 °C
3 January 1967
Wettest day
388 mm
3 September 1998
Windiest day
44.7 km/h
24 March 1992
Strongest gust
81.4 km/h
24 March 1992
Hottest feels-like
48.6 °C
12 August 2019
Coldest feels-like
1.2 °C
5 February 1964
Sunniest day
13.2 h
9 June 1972
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 23.5 °C | 0.0 °C | 1 mm | -11 mm |
| Feb | 26.5 °C | +0.1 °C | 2 mm | -10 mm |
| Mar | 32.0 °C | 0.0 °C | 9 mm | -7 mm |
| Apr | 33.4 °C | -1.7 °C | 119 mm | +78 mm |
| May | 33.6 °C | -0.6 °C | 123 mm | +22 mm |
| Jun | 34.4 °C | +1.9 °C | 132 mm | -162 mm |
| Jul | 34.3 °C | +3.1 °C | 207 mm | -224 mm |
| Aug | 32.4 °C | +1.1 °C | 636 mm | +294 mm |
| Sep | 33.1 °C | +2.2 °C | 217 mm | -40 mm |
| Oct | 31.5 °C | +1.3 °C | 285 mm | +203 mm |
| Nov | 29.4 °C | +1.2 °C | 8 mm | +2 mm |
| Dec | 24.3 °C | -0.8 °C | 0 mm | -4 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Biratnagar?
Biratnagar has a humid subtropical, dry winter climate (Köppen Cwa). Over 1940-2025, the average annual temperature is 24.7 °C and it receives 1,597 mm of precipitation per year.
What is the hottest day ever recorded in Biratnagar?
The hottest day measured in Biratnagar between 1940 and 2025 was 26 May 1957, reaching 45.8 °C.
What is the coldest day in Biratnagar?
The coldest day measured in Biratnagar between 1940 and 2025 was 3 January 1967, at 4.7 °C.
Does it snow in Biratnagar?
Almost never: Biratnagar sees virtually no snow, with about 0 frost days per year.
Has the climate of Biratnagar warmed?
Yes: Biratnagar warmed by +1.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Biratnagar?
The wettest day measured in Biratnagar between 1940 and 2025 was 3 September 1998, with 388 mm of rain in 24 hours.
What was the windiest day in Biratnagar?
The windiest day measured in Biratnagar between 1940 and 2025 was 24 March 1992, with winds reaching 44.7 km/h.
What is the warmest month in Biratnagar?
The warmest month in Biratnagar is May (29.2 °C on average); the coldest is January (16.6 °C).
How much does it rain in Biratnagar?
Biratnagar receives on average 1,597 mm of precipitation per year, spread over about 142 rainy days.
Is it sunny in Biratnagar?
Biratnagar gets on average 9.6 hours of sunshine per day, roughly 3,504 hours per year over 1940-2025.
Are there tropical nights in Biratnagar?
Yes: Biratnagar has on average 212 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Biratnagar?
In Biratnagar, between 1940 and 2025, the highest apparent temperature reached 48.6 °C on 12 August 2019, and the lowest was 1.2 °C on 5 February 1964.
Compare Biratnagar with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Biratnagar