Analyzing climatic data (Nepal)

(Based on the data analysis of Chisapani, Karnali, Nepal)

1. Analysis of Rainfall

This analysis is based on available data of Chisapani, Karnali. Climatic data of 43 years was available for analysis from 1970 to 2013 A.D. Monthly rainfall data was analyzed to find the trend of rainfall. Rainfall trend helps to analyze the pattern of rainfall in future through the past data. Though data can mislead to seasonal, annual & decade long-term generalization with demerits of the statistical mean technique used hereby.

1.1 Pre-Monsoon Rainfall (March-May)

Pre-monsoon rainfall is shown in figure 1. There is high fluctuation in the rainfall pattern in different years. Since 1970, pre-monsoon rainfall is found decreasing at the rate of 0.413mm/year.

1.2 Monsoon Rainfall June- September)

Monsoon rainfall is increasing by 3.3702mm/ year. The trend is shown in the figure below.

1.3 Post-monsoon Rainfall (October- November)

Rainfall is seen fluctuating in the post-monsoon season. The rainfall is decreasing in this season by 0.6756mm/ year.

1.4 Winter rainfall (December- February)

Winter rainfall is also declining. The rate is 0.4884 mm/ year.

1.5 Total Annual Rainfall

The rainfall versus year graph is shown in the figure. The trend line of annual rainfall shows that annual rainfall is increasing, with the rate 1.7931mm/year.

1.6 Average Monthly Rainfall Curve

Average monthly rainfall curve was prepared from the given data. The average monthly rainfall is in increasing trend by 11.832 mm/month but the rainfall is confined to only a few months i.e. rainfall is not evenly distributed in different months. Most rainfall occurs in the month of July, August.

2. Analysis of Temperature

For analysis of temperature data is available for 43 years from 1970 to 2013 A.D. Minimum temperature, maximum temperature and the average temperature was obtained from the data analysis.

2.1 Maximum Annual Temperature

Maximum average the annual temperature was analyzed through the data. The data shows that the maximum annual temperature is in a decreasing trend by 0.0119℃ per year.

2.2 Minimum Annual Temperature

The minimum temperature graph is shown in the figure below. The graph shows the minimum temperature is increasing. The temperature is increasing by 0.0246 ℃ per annum as shown in the figure.

 

2.3 Average Annual Temperature

The average annual temperature (average of maximum temperature and minimum temperature) is found increasing by 0.0065 ℃ per year. The years above the trendline represents hot year whereas below the trendline, it represents the cold year.

3. Ombrothermic Graph

Ombrothermic graphs are graphs/diagrams that summarize trends in temperature and precipitation in a single picture for at least 30 years. They allow establishing the relationship between temperature and precipitation and to determine the length of dry, wet, and extremely wet periods.

Rainfall is high during July and August, whereas temperature is maximum during May and June. The temperature is generally high when there is less rainfall.

Thank You!! :)