Pre-monsoon (March, April and May - MAM) rainfall over India is highly variable. A pre-whitened Mann-Kendall test was used to investigate trends in rainfall during MAM. The results indicate the presence of a significant (at the 10% level) increasing trend at four stations (Ajmer, Bikaner, Indore and Kolkata), out of which two stations (Ajmer and Bikaner) show a statistically significant increasing trend. A decreasing trend is observed at two stations (Belgaum and Minicoy). Practical significance was also explored in terms of percentage changes, using the Theil-Sen median slope estimator. Forecasts made using a univariate autoregressive integrated moving average (ARIMA) model for MAM indicate that there has been a significant rise in the pre-monsoon rainfall over the northwestern part of India.
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Narayanan et al. (2016) studied this question.
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