Frequencies for first 10,000 rows of weather variable in accident dataset :

Atmospheric |
  Condition |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      9,073       90.73       90.73
          2 |        639        6.39       97.12
          3 |         11        0.11       97.23
          4 |         50        0.50       97.73
          5 |        154        1.54       99.27
          8 |         22        0.22       99.49
          9 |         51        0.51      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Apr 2016