Monday, May 6, 2013
May weather trend in Kathmandu in recent years
May is the hottest month in Kathmandu. This is also the month in which Kathmandu is blessed with pre-monsoon rain.
This year, the month started with slightly hotter than average May day, however, the temperature was gradually lowered due to rain pours, for which the average maximum temp dipped just below the average max of 30°C. The average maximum temperature in recent year also is in par with last 30 years' average, however, the average minimum temperature is 1.3°C higher than last 30 years' average min of 15°C. Whereas, this May, the average min temp was 2°C higher than the 30 years, and also the highest with 17.1°C.
The month of May in year 2012 was the hottest compared to the rest in recent years. In 2012, most of the days were at 30°C or above. In year 2012, May 24 and 25, registered the highest maximum temperature of 34°C, the highest for the month of May in recent years. On the same time, the year 2012 also had the lowest minimum temperature of 10°C for the month of May. On the other hand, year 2008 and 2011 Mays had the lowest maximum temperature of 28.9°C, and year 2011 had only 6 days with max temp at 30°C or above. Whereas May 2013 saw 18 days with daytime hi at or above 30°C. May 2nd was the hottest with 33.4°C, while 4th registered the lowest mercury reading at 11.5°C. On the other hand, May 31st had the lowest daytime maximum temp of 23.4°C, whereas 26th was the warmest day with mercury not diving below 21°C for whole day.
Average monthly rainfall in Kathmandu in May is 123.6mm. The maximum 24 hours rainfall recorded in May was 73.2mm in May 29, 1990. However, the average rainfall in past 6 year is below the 30 years' average at 110mm. The year 2012 May received less than 50% of the monthly rainfall, with just 52.8mm, whereas the preceding two years, 2010 and 2011 received more than average rainfall of 144mm and 157mm respectively. This year, despite it was quite a dry month for the first half, the second half of the month received intensive amount of rainfall. On contrast to the previous year, the total monthly rainfall was 276.5mm more than double the normal. May 23rd registered the record 24 hour maximum rainfall of 100.5mm, due to which Kathmandu valley traffic was in total chaos for flash floods.
Below comparison of May 2013 weather trend to past six years trend.
Averages and extremes
Number of warm and cold days
data: Meteorological Forecasting Division, Department of Hydrology and Meteorology, World Meteorological Organization, yalamandu.com
Monthly weather trends in recent years for other months:
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Weather Forecast for next 48 hours
Kathmandu Rainfall watch
Nepal Flood Watch