Bettiah climate — normals and trends
Bettiah (India) has a humid subtropical, dry winter climate (Cwa) under the Köppen-Geiger classification. Its mean annual temperature is 25.3 °C and it receives 1,423 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 (31.5 °C on average) and the coldest is January (16.0 °C). Rainfall peaks in July.
Bettiah averages 0 frost days, 219 hot days (≥ 30 °C) and 128 rainy days per year.
Bettiah has warmed by +1.0 °C between 1940 and 2025, or +0.12 °C per decade. This trend is statistically significant.
The hottest day of the period reached 46.6 °C (on 26 May 1957) and the coldest 3.7 °C (on 9 January 2013).
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
BettiahBihar
- coords
- 26.80°, 84.50°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
25.3°C
Average daily high
31.0°C
Average daily low
20.5°C
Annual rainfall
1,423mm
Sunshine / day
10.1h
Mean relative humidity
67%
Average peak wind
14.5km/h
Seasonal range
15.5°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
219 d/yr
Rainy days (≥ 1 mm)
128 d/yr
Annual snowfall
0.0 cm
Average feels-like high
33.5 °C
Average feels-like low
22.3 °C
Average peak gust
29.6 km/h
Tropical nights (≥ 20 °C)
212 d/yr
Solar radiation
17.9 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.0 °C
since 1940
+0.1 °C per decade · r² = 0.26 · 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
46.6 °C
26 May 1957
Coldest day
3.7 °C
9 January 2013
Wettest day
249 mm
16 June 1963
Windiest day
44.2 km/h
19 July 1975
Strongest gust
84.2 km/h
4 October 1968
Hottest feels-like
49.4 °C
15 May 2004
Coldest feels-like
0.7 °C
31 January 1964
Sunniest day
13.0 h
13 May 1940
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 | 21.3 °C | -1.5 °C | 0 mm | -19 mm |
| Feb | 26.6 °C | +0.2 °C | 1 mm | -19 mm |
| Mar | 32.5 °C | +0.1 °C | 4 mm | -14 mm |
| Apr | 34.8 °C | -2.3 °C | 77 mm | +52 mm |
| May | 35.1 °C | -2.5 °C | 76 mm | +21 mm |
| Jun | 36.0 °C | +0.5 °C | 175 mm | -37 mm |
| Jul | 34.4 °C | +2.2 °C | 177 mm | -215 mm |
| Aug | 32.8 °C | +0.8 °C | 485 mm | +152 mm |
| Sep | 33.2 °C | +1.6 °C | 298 mm | +43 mm |
| Oct | 31.1 °C | +0.3 °C | 279 mm | +205 mm |
| Nov | 28.6 °C | +0.2 °C | 6 mm | -3 mm |
| Dec | 22.2 °C | -2.4 °C | 0 mm | -10 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 Bettiah?
Bettiah has a humid subtropical, dry winter climate (Köppen Cwa). Over 1940-2025, the average annual temperature is 25.3 °C and it receives 1,423 mm of precipitation per year.
What is the hottest day ever recorded in Bettiah?
The hottest day measured in Bettiah between 1940 and 2025 was 26 May 1957, reaching 46.6 °C.
What is the coldest day in Bettiah?
The coldest day measured in Bettiah between 1940 and 2025 was 9 January 2013, at 3.7 °C.
Does it snow in Bettiah?
Almost never: Bettiah sees virtually no snow, with about 0 frost days per year.
Has the climate of Bettiah warmed?
Yes: Bettiah warmed by +1.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Bettiah?
The wettest day measured in Bettiah between 1940 and 2025 was 16 June 1963, with 249 mm of rain in 24 hours.
What was the windiest day in Bettiah?
The windiest day measured in Bettiah between 1940 and 2025 was 19 July 1975, with winds reaching 44.2 km/h.
What is the warmest month in Bettiah?
The warmest month in Bettiah is May (31.5 °C on average); the coldest is January (16.0 °C).
How much does it rain in Bettiah?
Bettiah receives on average 1,423 mm of precipitation per year, spread over about 128 rainy days.
Is it sunny in Bettiah?
Bettiah gets on average 10.1 hours of sunshine per day, roughly 3,687 hours per year over 1940-2025.
Are there tropical nights in Bettiah?
Yes: Bettiah has on average 212 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Bettiah?
In Bettiah, between 1940 and 2025, the highest apparent temperature reached 49.4 °C on 15 May 2004, and the lowest was 0.7 °C on 31 January 1964.
Compare Bettiah with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Bettiah