weather data including solar radiation - NARI
weather data including solar radiation - NARI weather data including solar radiation - NARI
The average weather data is given in table 1.Table 1 Average weather of Phaltan weatherParameter Instrument used ValueTemperatureMean daily maximum 33.5 °CMin/maxMean daily minimum 18.8 °CthermometerMean daily average25.1 °CYearly rainfall521 mm/yRainfallMean rainfall8.12 mm/dClass A raingaugeintensityNumber of rainy days64 d/yWind Mean velocity Anemometer 5.06 km/hMean daily maximum 81.6 %RelativeClass AMean daily minimum 36.7 %humidityhygrothermographMean daily average59.1 %EvaporationMean daily5.40 mm/dPanevaporationSolar radiationYearly radiationTotal radiation 1549 kWh/m²-yMean daily radiation pyranometer 4.77 kWh/m²-dComposites for temperature, rainfall and solar radiation are given in figures 2, 3 and4. The standard deviations of the values from all the years are shown in figures 2 and4.4540Air temperature (°C)3530252015Daily maxDaily minDailyaverage1050J F M A M J J A S O N DMonthFigure 2 Temperature composite©NARI – September 2006 2/7
1488%Rainfall (mm/d)12108641%14% 45%420J F M A M J J A S O N DMonthFigure 3 Rainfall composite87Solar radiation (kWh/m²-d)654321Solarradiation0J F M A M J J A S O N DMonthFigure 4 Solar radiation compositeFigure 3 indicates that most of the rainfall falls during 5 month (June, July, August,September and October). Two peaks correspond to onsetting and recedingmonsoons. Phaltan gets most of its rainfall during receding monsoon. Thus secondpeak is much more significant, accounting for 41% of yearly rainfall in 43 days only.As most regions in India, rainfall is highly concentrated with an average of only 64rainy days in the year and 72% of yearly rainfall falling in one fifth of the rainy days.These heavy downpours are difficult to harvest because of the surface runoff.Besides, yearly rainfall at Phaltan is 521mm which is quite low compared to thenational average of 1280mm 2 . Moreover, the region is drought-prone as shown bythe coefficient of variability of yearly rainfall of 35% which is quite high. Efficient water©NARI – September 2006 3/7
- Page 1: Long term weather trends in western
- Page 6 and 7: 100Relative humidity (%)90807060504
The average <strong>weather</strong> <strong>data</strong> is given in table 1.Table 1 Average <strong>weather</strong> of Phaltan <strong>weather</strong>Parameter Instrument used ValueTemperatureMean daily maximum 33.5 °CMin/maxMean daily minimum 18.8 °CthermometerMean daily average25.1 °CYearly rainfall521 mm/yRainfallMean rainfall8.12 mm/dClass A raingaugeintensityNumber of rainy days64 d/yWind Mean velocity Anemometer 5.06 km/hMean daily maximum 81.6 %RelativeClass AMean daily minimum 36.7 %humidityhygrothermographMean daily average59.1 %EvaporationMean daily5.40 mm/dPanevaporationSolar <strong>radiation</strong>Yearly <strong>radiation</strong>Total <strong>radiation</strong> 1549 kWh/m²-yMean daily <strong>radiation</strong> pyranometer 4.77 kWh/m²-dComposites for temperature, rainfall and <strong>solar</strong> <strong>radiation</strong> are given in figures 2, 3 and4. The standard deviations of the values from all the years are shown in figures 2 and4.4540Air temperature (°C)3530252015Daily maxDaily minDailyaverage1050J F M A M J J A S O N DMonthFigure 2 Temperature composite©<strong>NARI</strong> – September 2006 2/7
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