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1. Climate of Sri Lanka B.V.R. Punyawardena
Head Agro climatology Division
Natural Resources Management Center
Department of Agriculture
Peradeniya
2. Climate of Sri Lanka
3. Rainfall Seasons in Sri Lanka
First Intermonsoon ? March-April
Southwest Monsoon ? May - September
Second Intermonsoon ? October-November
Northeast Monsoon ? December-February
4. First Inter Monsoon (March-April)
5. Southwest Monsoon (May-Sept)
6. Second Inter Monsoon (Oct-Nov)
7. Northeast Monsoon (Dec-Feb)
8. Rainfall during different seasons
10. Rainfall
Two peaks (bi-modal)
thus, 2 cultivation seasons
Minor rainy season - Yala (March - August)Major rainy season - Maha (September - February)
Yala season
Convectional rains - FIM
Southwest monsoon
Maha season
Convection rains - SIM
Northeast monsoon rains
disturbances, depressions, cyclones
11. Monthly rainfall distribution of Sri Lanka
14. Temperature Dry zone
Annual Maximum
30 - 34 0C
Annual Minimum
21 24 0C
Intermediate zone Low country
Annual Maximum
30 - 34 0C
Annual Minimum
20 22 0C
Intermediate zone Mid country
Annual Maximum
22 - 32 0C
Annual Minimum
19 22 0C
Intermediate zone Up country
Annual Maximum
23 - 27 0C
Annual Minimum
14 16 0C
15. Temperature Wet zone Low country
Annual Maximum
30 - 33 0C
Annual Minimum
21 24 0C
Wet zone Mid country
Annual Maximum
28 - 32 0C
Annual Minimum
19 22 0C
Wet zone Up country
Annual Maximum
18 - 22 0C
Annual Minimum
11 14 0C
Frost in UCWZ February - March
16. Humidity Varies around 60 - 70% in day time and around 85 - 90% at night
May to September
Dry zone
drops to 50 - 60%
Kachchan
17. Evaporation Marked seasonal variation of Epan across the island
Wet zone
highest during March and September
? 4 mm/day
Dry zone
highest during May to September
? 6 mm/day