0 0 NO PRECIPITATION
1 1 WITHIN THE LAST HOUR
2 2 1 TO 2 HOURS AGO
3 3 2 TO 3 HOURS AGO
4 4 3 TO 4 HOURS AGO
5 5 4 TO 5 HOURS AGO
6 6 5 TO 6 HOURS AGO
7 7 6 TO 8 HOURS AGO
8 8 8 TO 10 HOURS AGO
9 9 MORE THAN 10 HOURS AHO
15 15 MISSING VALUE
