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

Atmospheric |
  Condition |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      8,996       89.96       89.96
          2 |        728        7.28       97.24
          3 |          6        0.06       97.30
          4 |         35        0.35       97.65
          7 |        130        1.30       98.95
          9 |        105        1.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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