Publication Name
Brahmaputra basin climate indicators – Rainfall
Temperature
How much does it rain? Rainfall intensity on a rainy day
Where is it hot and where is it cold? Average winter minimum temperature
Average summer maximum temperature
1981 – 2007
1981 – 2007
1951–1980
1981–2007
Millimetres per day
ºC
50 -5 -10 -15 -20
35 10 15 20 25 30
4 6 8 10 12 14 16 18 20
For how long does it rain? Rainy days in a year
How hot and how cold? Lowest minimum temperature
Highest maximum temperature
1981 – 2007
1981 – 2007
1951–1980
1981–2007
ºC
20 25 30 35 40
Number of rainy days
5 0 -5 -10 -15 -20 -25 -30 -35
40 60 80
120 100 140 160 180 200
Where does it rain? Spatial distribution of rainfall, 1981–2007
Temperature changes Changes in temperature between the past (1951–1980) and recent period (1981–2007)
Winter
Summer
Lower minimum
Highest maximum
Millimetres
ºC
20
100
500
1000
2000
10
50
250
750
1500
2500
-3 -4 -2 -1 0 1 2 3 4
Max T
When does it rain? Monthly averages, millimetres
When is it hot and when is it cold? Monthly average temperature, ºC
Min T
40
300
Upper basin
Lower basin
250
1952 (wettest year) 2006 (dryest year)
30
200
20
150
10
100
0
50 0
-10
March
May
July
September
November
January
March
May
July
September
November
January
February
April
June
August
October
December
February
April
June
August
October
December
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