Introduction

The updated missing values have been obtained based on following steps.

  1. step 1: Based on literature review, for each station, if a day has more than 10 NAs out of 24, that day has been removed.
  2. step 2: After getting the data of previous step, for each station, if a year has more than 20 percent missing values, that year has been removed.
  3. step 3: Regarding three threshoulds of missing values including 10, 20 and 30 percent, the number of stations considering time spans of 1910, 1920, 1930, 1940, 1950, 1960, 1970 and 1980 all to 2018 have been calculated for each station. The results have been plotted as follows.
Besides, the number of stations having data in each year have been plotted as well.

10 percent scenario

20 percent scenario

30 percent scenario

Number of stations plotted against year