Forbesganj climate — normals and trends
Forbesganj (India) has a humid subtropical, dry winter climate (Cwa) under the Köppen-Geiger classification. Its mean annual temperature is 24.7 °C and it receives 2,010 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 (28.7 °C on average) and the coldest is January (16.6 °C). Rainfall peaks in July.
Forbesganj averages 0 frost days, 209 hot days (≥ 30 °C) and 160 rainy days per year.
Forbesganj has warmed by +1.4 °C between 1940 and 2025, or +0.17 °C per decade. This trend is statistically significant.
The hottest day of the period reached 46.4 °C (on 26 May 1957) and the coldest 4.0 °C (on 31 January 1964).
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
ForbesganjBihar
- coords
- 26.30°, 87.27°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
24.7°C
Average daily high
30.3°C
Average daily low
20.1°C
Annual rainfall
2,010mm
Sunshine / day
9.5h
Mean relative humidity
72%
Average peak wind
14.4km/h
Seasonal range
12.1°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
209 d/yr
Rainy days (≥ 1 mm)
160 d/yr
Annual snowfall
0.0 cm
Average feels-like high
33.3 °C
Average feels-like low
22.0 °C
Average peak gust
29.4 km/h
Tropical nights (≥ 20 °C)
215 d/yr
Solar radiation
16.8 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.4 °C
since 1940
+0.2 °C per decade · r² = 0.48 · 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
46.4 °C
26 May 1957
Coldest day
4.0 °C
31 January 1964
Wettest day
272 mm
12 July 1966
Windiest day
44.8 km/h
17 October 1985
Strongest gust
85.7 km/h
17 October 1985
Hottest feels-like
49.3 °C
7 June 1964
Coldest feels-like
0.3 °C
28 January 1964
Sunniest day
13.2 h
16 June 1945
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 | 23.6 °C | -0.3 °C | 1 mm | -15 mm |
| Feb | 27.1 °C | +0.2 °C | 7 mm | -9 mm |
| Mar | 32.2 °C | -0.3 °C | 17 mm | -11 mm |
| Apr | 33.2 °C | -2.0 °C | 182 mm | +108 mm |
| May | 32.9 °C | -0.9 °C | 241 mm | +70 mm |
| Jun | 33.9 °C | +1.4 °C | 251 mm | -105 mm |
| Jul | 33.4 °C | +1.8 °C | 320 mm | -153 mm |
| Aug | 32.8 °C | +1.1 °C | 553 mm | +137 mm |
| Sep | 33.3 °C | +2.0 °C | 361 mm | +26 mm |
| Oct | 31.6 °C | +1.1 °C | 325 mm | +213 mm |
| Nov | 29.5 °C | +0.9 °C | 18 mm | +10 mm |
| Dec | 24.3 °C | -1.2 °C | 0 mm | -6 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 Forbesganj?
Forbesganj has a humid subtropical, dry winter climate (Köppen Cwa). Over 1940-2025, the average annual temperature is 24.7 °C and it receives 2,010 mm of precipitation per year.
What is the hottest day ever recorded in Forbesganj?
The hottest day measured in Forbesganj between 1940 and 2025 was 26 May 1957, reaching 46.4 °C.
What is the coldest day in Forbesganj?
The coldest day measured in Forbesganj between 1940 and 2025 was 31 January 1964, at 4.0 °C.
Does it snow in Forbesganj?
Almost never: Forbesganj sees virtually no snow, with about 0 frost days per year.
Has the climate of Forbesganj warmed?
Yes: Forbesganj warmed by +1.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Forbesganj?
The wettest day measured in Forbesganj between 1940 and 2025 was 12 July 1966, with 272 mm of rain in 24 hours.
What was the windiest day in Forbesganj?
The windiest day measured in Forbesganj between 1940 and 2025 was 17 October 1985, with winds reaching 44.8 km/h.
What is the warmest month in Forbesganj?
The warmest month in Forbesganj is May (28.7 °C on average); the coldest is January (16.6 °C).
How much does it rain in Forbesganj?
Forbesganj receives on average 2,010 mm of precipitation per year, spread over about 160 rainy days.
Is it sunny in Forbesganj?
Forbesganj gets on average 9.5 hours of sunshine per day, roughly 3,468 hours per year over 1940-2025.
Are there tropical nights in Forbesganj?
Yes: Forbesganj has on average 215 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Forbesganj?
In Forbesganj, between 1940 and 2025, the highest apparent temperature reached 49.3 °C on 7 June 1964, and the lowest was 0.3 °C on 28 January 1964.
Compare Forbesganj with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Forbesganj